Abstract: A method of cleansing a redox flow battery system may include operating the redox flow battery system in a charge, discharge, or idle mode, and responsive to a redox flow battery capacity being less than a threshold battery capacity, mixing the positive electrolyte with the negative electrolyte. In this way, battery capacity degradation following cyclic charging and discharging of the redox flow battery system can be substantially reduced.

Abstract: A redox flow battery includes a redox flow cell, a supply/storage system external of the redox flow cell, and a controller. The supply/storage system includes first and second electrolytes for circulation through the redox flow cell. The first electrolyte is a liquid electrolyte having electrochemically active species with multiple, reversible oxidation states. The electrochemically active species can form a solid precipitate blockage in the redox flow cell. The controller is configured to identify whether there is the solid precipitate blockage in the redox flow cell and, if so, initiate a regeneration mode that reduces the oxidation state of the electrochemically active species in the liquid electrolyte to dissolve, in situ, the solid precipitate blockage.

Abstract: A battery pack which includes: a battery cell which contains a non-aqueous electrolyte, wherein the battery cell is a non-aqueous electrolyte secondary battery; a casing which stores the battery cell; and at least one liquid leakage sensor which detects liquid leakage from the battery cell, wherein the casing and/or the battery cell have a leaked liquid retention region in which the non-aqueous electrolyte tends to be retained when the non-aqueous electrolyte leaks out of the battery cell, wherein the liquid leakage sensor outputs measurement information as a detection result without using a charging/discharging circuit which charges and discharges the battery cell, and wherein at least one sensor unit of the liquid leakage sensor is provided in the leaked liquid retention region.

Abstract: Described is a battery de-passivation circuit that generally comprises a battery having a de-passivation circuit attached across its positive and negative terminals. The de-passivation circuit includes a switch that can open or close the de-passivation circuit, a resistor that can regulate the amount of current drawn from the battery and a clock and timer controller system that controls the switch. The controller system controls closing the circuit long enough to bring the passivation level build-up within the battery to an acceptable lower level and controls opening the circuit long enough to allow passivation levels to build-up to an acceptable upper level.

Abstract: The circulation rates of the electrolyte solutions in a flow battery can impact operating performance. Adjusting the circulation rates can allow improved performance to be realized. Flow battery systems having adjustable circulation rates can include a first half-cell containing a first electrolyte solution, a second half-cell containing a second electrolyte solution, at least one pump configured to circulate the first electrolyte solution and the second electrolyte solution at adjustable circulation rates through at least one half-cell in response to a value of Pexit/I or I/Penter, and at least one sensor configured to measure net electrical power entering or exiting the flow battery system, and an amount of electrical current passing through the whole cell. I is the electrical power passing through the whole cell. Pexit is net electrical power exiting the system in a discharging mode, and Penter is net electrical power entering the system in a charging mode.

Abstract: A metal air battery according to one embodiment of the present invention includes a pair of air cathodes having planar shapes respectively, which have a first bonding portion bonded along edges of the pair of the air cathodes and are disposed to face each other; a pair of separators disposed in contact with the pair of the air cathodes; an anode having a planar shape disposed between the pair of the separators and electrically insulated from the pair of the air cathodes; and then a zinc gel disposed in an accommodation space between the pair of the air cathodes. The accommodation space is a space formed by elastic deformation of the pair of the air cathodes.

Abstract: A method of determining a distribution of electrolytes in a flow battery includes providing a flow battery with a fixed amount of fluid electrolyte having a common electrochemically active specie, a portion of the fluid electrolyte serving as an anolyte and a remainder of the fluid electrolyte serving as a catholyte. An average oxidation state of the common electrochemically active specie is determined in the anolyte and the catholyte and, responsive to the determined average oxidation state, a molar ratio of the common electrochemically active specie between the anolyte and the catholyte is adjusted to increase an energy discharge capacity of the flow battery for the determined average oxidation state.

Abstract: Provided are a liquid activated air battery and an assembled liquid activated air battery, which can be reduced in size, as well as a method of using the liquid activated air battery and the assembled liquid activated air battery. The liquid activated air battery includes: an electrode assembly comprising a cathode and an anode; and a space that serves as a liquid container to store a liquid component of an electrolyte of the air battery before injection and also serves as a gas flowing member through which oxygen-containing gas of an active material of the air battery flows after injection. The assembled liquid activated air battery includes a plurality of the liquid activated air battery.

Abstract: A system for erasing an ink from a medium includes the medium having the ink printed on a surface thereof, and an erasure fluid directly or indirectly applied to the surface. The system further includes an inert base upon which the medium is placed, and an electrochemical cell. The electrochemical cell includes a cathode and an anode, both positioned adjacent the surface of the medium having the ink printed thereon, and a power source to apply a voltage across the medium.

Abstract: An electrochemical cell system is configured to utilize an ionically conductive medium flowing through a plurality of electrochemical cells. One or more disperser chambers are provided to disrupt or minimize electrical current flowing between the electrochemical cells, such as between the cathode of one cell and the anode of a subsequent cell by dispersing the ionically conductive medium. Air is introduced into the disperser chamber to prevent the formation of foamed ionically conductive medium, which may reconnect the dispersed ionically conductive medium, allowing the current to again flow therethrough.

Abstract: Various methods of rebalancing electrolytes in a redox flow battery system include various systems using a catalyzed hydrogen rebalance cell configured to minimize the risk of dissolved catalyst negatively affecting flow battery performance. Some systems described herein reduce the chance of catalyst contamination of RFB electrolytes by employing a mediator solution to eliminate direct contact between the catalyzed membrane and the RFB electrolyte. Other methods use a rebalance cell chemistry that maintains the catalyzed electrode at a potential low enough to prevent the catalyst from dissolving.

Abstract: In one embodiment, the present invention relates generally to a system for providing a flow through battery cell and uses thereof. In one embodiment, the flow through battery cell includes an inlet for receiving a flow of water, a solid oxidizer coupled to the inlet for reacting with the flow of water to generate a catholyte, wherein the solid oxidizer comprises at least one of: an organic halamine, a succinimide or a hypochlorite salt, a galvanic module coupled to the solid oxidizer for receiving the catholyte and generating one or more effluents and an outlet for releasing the one or more effluents.

Abstract: In one embodiment, a flow battery system includes a reactor, a first pump operably connected to a first electrolyte tank and to the reactor, a second pump operably connected to a second electrolyte tank and to the reactor, a memory including program instructions stored therein, and a controller operably connected to the first pump, the second pump, and the memory and configured to execute the program instructions to determine a first flow rate through the first pump based upon first pump operating parameters including a differential pressure across the first pump, control the first pump based upon the first flow rate, determine a second flow rate through the second pump based upon second pump operating parameters including a differential pressure across the second pump, control the second pump based upon the second flow rate.

Abstract: An air battery system may include an air battery cell containing an air cathode, an anode, a separator, and an oxygen gas supply for supplying an oxygen gas by bubbling to a liquid electrolyte. The air cathode may include an air cathode layer containing a conductive material, and an air cathode current collector for collecting current of the air cathode layer. The anode may include an anode layer containing an anode active material which stores and releases a metal ion, and an anode current collector for collecting current of the anode layer. The separator may be provided between the air cathode layer and the anode layer, wherein the air cathode layer and the anode layer may be constantly filled with the liquid electrolyte at a time of a change in a volume of the electrode caused by a discharge or a discharge and charge.

Abstract: A battery system includes at least one lithium cell with an electrolyte having at least one polymer which is configured to be impregnated with an electrolyte fluid. In order to increase the capacity, the life and the safety of the battery system, the battery system further includes at least one electrolyte fluid metering device, by which at least one component of the electrolyte fluid can be supplied to the lithium cell and/or by which electrolyte fluid can be discharged from the lithium cell.

Abstract: Ingestible event marker systems that include an ingestible event marker (i.e., an IEM) and a personal signal receiver are provided. Embodiments of the IEM include an identifier, which may or may not be present in a physiologically acceptable carrier. The identifier is characterized by being activated upon contact with a target internal physiological site of a body, such as digestive tract internal target site. The personal signal receiver is configured to be associated with a physiological location, e.g., inside of or on the body, and to receive a signal the IEM. During use, the IEM broadcasts a signal which is received by the personal signal receiver.

Abstract: An iron redox flow battery system, comprising a redox electrode, a plating electrolyte tank, a plating electrode, a redox electrolyte tank with additional acid additives that may be introduced into the electrolytes in response to electrolyte pH. The acid additives may act to suppress undesired chemical reactions that create losses within the battery and may be added in response to sensor indications of these reactions.

Abstract: Various methods of rebalancing electrolytes in a redox flow battery system include various systems using a catalyzed hydrogen rebalance cell configured to minimize the risk of dissolved catalyst negatively affecting flow battery performance. Some systems described herein reduce the chance of catalyst contamination of RFB electrolytes by employing a mediator solution to eliminate direct contact between the catalyzed membrane and the RFB electrolyte. Other methods use a rebalance cell chemistry that maintains the catalyzed electrode at a potential low enough to prevent the catalyst from dissolving.

Abstract: Disclosed herein are various embodiments of redox flow battery systems having modular reactant storage capabilities. Accordingly to various embodiments, a redox flow battery system may include an anolyte storage module configured to interface with other anolyte storage modules, a catholyte storage module configured to interface with other catholyte storage modules, and a reactor cell having reactant compartments in fluid communication with the anolyte and catholyte storage modules. By utilizing modular storage modules to store anolyte and catholyte reactants, the redox flow battery system may be scalable without significantly altering existing system components.

Abstract: Methods and apparatuses are disclosed for mitigating electrolyte migration in a redox flow battery system. A first parameter of a first electrolyte in a first flow path of a redox flow battery cell block may be measured. The first flow path may have an inlet to and an outlet from the redox flow battery cell block. A second parameter of a second electrolyte in a second flow path of the redox flow battery cell block may be measured. The second flow path may have an inlet to and an outlet from the redox flow battery cell block. The first parameter may be detected to be greater than the second parameter. A first device coupled to the redox flow battery cell block in the second flow path may be operated to increase the second parameter in the second flow path.

Abstract: This invention provides a lithium-ion battery in which a coating film forming agent degradation reaction is prevented. A lithium-ion battery 100 in which electrodes 1 and 2 and an electrolyte are accommodated in a battery container 13 , and which has a means of for adding a coating film forming agent 20 for adding a coating film forming agent 21 that forms a coating film on the surface of each of electrodes 1 and 2 to an electrolyte in a battery container 13 is provided. With the use of such means of adding a coating film forming agent 20, a reaction of electrochemical degradation of a coating film forming agent 21 is prevented, allowing long-term preservation. Also, with the addition of a coating film forming agent 21 to an electrolyte, a deteriorated coating film on the surface of each of electrodes 1 and 2 is repaired such that a lithium-ion battery 100 can be regenerated, resulting in extension of battery life.

Abstract: A flow battery system may include at least one electrolyte tank for storing electrolytes. The system may also include a plurality of reaction cells, each having an output current. The system may further include a plurality of pumps, each associated with one of the plurality of reaction cells, for pumping the electrolytes into the reaction cell at a flow rate. The system may also include a pump sensor configured to monitor the flow rate of at least one of the plurality of pumps. The system may also include an output sensor configured to monitor an output current of at least one of the plurality of reaction cells. The system may further include a controller configured to control the flow rate of at least one of the plurality of pumps based on the output current of the reaction cell associated with the at least one of the plurality of pumps.

Abstract: In one embodiment, a flow battery system includes a reactor, a first pump operably connected to a first electrolyte tank and to the reactor, a second pump operably connected to a second electrolyte tank and to the reactor, a memory including program instructions stored therein, and a controller operably connected to the first pump, the second pump, and the memory and configured to execute the program instructions to determine a first flow rate through the first pump based upon first pump operating parameters including a differential pressure across the first pump, control the first pump based upon the first flow rate, determine a second flow rate through the second pump based upon second pump operating parameters including a differential pressure across the second pump, control the second pump based upon the second flow rate.

Abstract: A lithium ion secondary battery includes: an outer covering material that is filled with an electrolyte; a collector that is housed in the outer covering material, formed with an electrode layer containing an active material, and electrically connected with the electrode layer; an insulation layer that is provided on the collector; and a low potential member that is provided on the insulation layer, has a lower oxidation reduction potential than the active material of the electrode layer, and possesses a reduction ability relative to the active material.

Abstract: A system for delivering water to a fluid electrolyte battery comprising at least one battery cell. Such a system includes a tank adapted to hold the fluid, a pump adapted to pump the fluid from the tank when the pump is turned on, at least one conduit adapted to transfer the fluid from the tank to the at least one battery cell, and a controller adapted to control the pump. The controller turns the pump on after an interval so that the fluid is transferred to the at least one battery cell.

Abstract: Methods for determining the state of charge of an electrolyte solution in a redox battery by optical absorption spectrophotometry are disclosed. The state of charge thus obtained may serve as a gauge for the amount of electro-chemical energy left in the system.

Abstract: An accumulator with an accumulator housing, having at least one cell changer, with several electrodes and liquid electrolyte in each cell chamber with at least one wall element in the cell chambers to divide the cell chambers into at least two intercommunicating volume chambers. In the lower region of the volume chambers is a communicating connection for the liquid electrolyte between the volume chambers and a pressure equalisation connection between the volume chambers is arranged in the upper region of the volume chambers to assure an equivalent air pressure in the intercommunicating volume chambers.

Abstract: In one embodiment, the present invention relates generally to a method and system for providing a flow through battery cell and uses thereof. In one embodiment, the flow through battery cell includes an inlet for receiving a flow of water, a solid oxidizer coupled to said inlet for reacting with said flow of water to generate a catholyte, wherein the solid oxidizer comprises at least one of: an organic halamine, a succinimide or a hypochlorite salt, a galvanic module coupled to the solid oxidizer for receiving the catholyte and generating one or more effluents and an outlet for releasing the one or more effluents.

Abstract: A lithium-ion battery cell includes at least two working electrodes, each including an active material, an inert material, an electrolyte and a current collector, a first separator region arranged between the at least two working electrodes to separate the at least two working electrodes so that none of the working electrodes are electronically connected within the cell, an auxiliary electrode including a lithium reservoir, and a second separator region arranged between the auxiliary electrode and the at least two working electrodes to separate the auxiliary electrode from the working electrodes so that none of the working electrodes is electronically connected to the auxiliary electrode within the cell.

Abstract: An electrochemical cell including a cell enclosure, a fill tube, a ball, a closing button, an anode, a cathode, and an electrolyte. The cell enclosure defines an internal volume and includes a cover forming a fillport through hole. The fill tube is separately formed, and defines a leading section, a trailing section, and a passageway. The leading section is secured within the fillport through hole. The ball is sealingly secured within the passageway. The closing button is also separately formed, and is sealingly secured within the fillport through hole adjacent the leading section of the fill tube. The anode, cathode, and electrolyte are maintained within the internal volume. By configuring the fill tube such that the leading section thereof is secured within the fillport through hole, an overall extension of the fill tube relative to the internal volume is greatly reduced, thereby maximizing a volumetric efficiency.

Abstract: Apparatus and methods for determining the individual states of charge of electrolytes in a redox battery with mixed or unmixed reactants by optical absorption spectrophotometry are disclosed. The state of charge thus obtained may serve as a gauge for the amount of electro-chemical energy left in the system. Further, the information on anolyte and catholyte charge states may be used for any rebalancing mechanism if the states are different.

Abstract: An electrochemical cell system and methods for controlling the system are provided that are operated to produce an amount of current based upon power draw. The cell utilizes a solution phase catholyte introduced into a cell containing a metallic anode and a catalytic surface. A cathodic species is introduced into the space between the anode and the surface as a liquid along with electrolyte and liquid caustic. The mixture of caustic, electrolyte and liquid catholyte is continuously recirculated through the space, and a portion of the recirculation stream is exhausted in order to control the concentration of reaction products in each cell. Controllable injection mechanisms are used to inject the liquids from storage sources based upon the monitored power draw. The control mechanism independently controls each injection mechanism to inject appropriate amounts of caustic, electrolyte and atholyte to achieve the desired concentrations.

Abstract: A system for supplying fluid to a battery, a vacuum source, a vehicle, a combination, a method for supplying fluid to a battery and a method of charging a battery. The fluid supply system supplies fluid to a battery in a vehicle, the vehicle including a frame supporting the battery, the battery including a battery cell, fluid being transmittable to the battery cell. The system is defined as including a hydraulic circuit connecting the battery to a tank. The hydraulic circuit is defined as including an inlet conduit connectable to tank, an outlet conduit connectable to the battery cell, and a vacuum source connectable to the battery cell and to the tank. The vacuum source is defined as including a pump having a pump inlet conduit connectable to the tank, and a pump outlet, and a venturi having a first inlet connectable to the pump outlet, a second inlet connectable to the battery cell, and a venturi outlet is connectable to the tank.

Abstract: A fuel cell hybrid vehicle utilizing flooded aqueous battery or batteries operatively coupled to a fuel cell stack, an electric drive motor, and an integrated watering system, the integrated watering system comprising: a heat exchanger configured to extract water from exhaust air from the fuel cell stack; a reservoir, operatively connected to store the water; a sensor, operatively connected to generate a signal based on the flooded aqueous batteries' electrolyte level; a pump, operatively connected to the reservoir and the flooded aqueous batteries; and a system controller, operatively connected to receive and evaluate the signal from the sensor and actuate the pump to move water from the reservoir to the flooded aqueous battery or batteries.

Abstract: A fuel cell system and method of operation in which the fuel cell system has a fuel cell unit with anode and cathode, a media flow path for supplying substantially pure hydrogen to the anode, a media flow path for the cathode, an anode exhaust-gas flow path and a cathode exhaust-gas flow path. A fan for supplying air to the cathode is provided in the flow path of the cathode, and a catalytic burner is arranged in the cathode exhaust-gas flow path. The anode exhaust-gas flow path opens into the catalytic burner and/or into the cathode exhaust-gas flow path upstream of the catalytic burner. The combined, catalytically converted fuel cell exhaust-gas flow is passed into an expansion machine.

Abstract: An electrochemical cell including a cell enclosure, a fill tube, a ball, a closing button, an anode, a cathode, and an electrolyte. The cell enclosure defines an internal volume and includes a cover forming a fillport through hole. The fill tube is separately formed, and defines a leading section, a trailing section, and a passageway. The leading section is secured within the fillport through hole. The ball is sealingly secured within the passageway. The closing button is also separately formed, and is sealingly secured within the fillport through hole adjacent the leading section of the fill tube. The anode, cathode, and electrolyte are maintained within the internal volume. By configuring the fill tube such that the leading section thereof is secured within the fillport through hole, an overall extension of the fill tube relative to the internal volume is greatly reduced, thereby maximizing a volumetric efficiency.

Abstract: A system for supplying fluid to a battery, a vehicle and a method for supplying fluid to a battery. The fluid supply system supplies fluid to a battery in a vehicle selectively powered by the battery, the vehicle including a frame supporting the battery, the battery including a battery cell, fluid being transmittable to the cell, gas generated during charging of the battery being transmittable out of the cell. The system is defined as including a tank for holding fluid, and a hydraulic circuit connecting the battery to the tank. The hydraulic circuit is defined as including an inlet conduit connectable between the tank and the cell, and an outlet conduit connectable between the cell and the tank, gas produced during charging causing fluid flow through the outlet conduit and to the tank. In the fluid supply system of the present invention, the gas produced during charging causes fluid flow through the system.

Abstract: A fuel cell includes a reaction chamber, at least one fuel chip stored in the reaction chamber, an electrolyte chamber communicated with the reaction chamber, electrolyte installed in the electrolyte chamber. The control element is movable between a first position and a second position. In the first position, the control element avoids the electrolyte flowing from the electrolyte chamber into the reaction chamber. In the second position, the control element allows the electrolyte to flow from the electrolyte chamber into the reaction chamber for reacting with the fuel chips for generating electricity. Alternatively, a pump is used to for pumping vapor into the reaction chamber for reacting with the fuel chips for generating electricity.

Abstract: A combination for supplying fluid to a battery, a vehicle and a method of assembling the combination. The combination includes the battery and a filling pod. The filling pod includes a filling pod housing having a filling pod port fluidly connectable to a fluid source for receiving fluid from the fluid source, a first fluid supply member fluidly connectable to a first cell and for supplying fluid from the filling pod port to the first cell, a second fluid supply member fluidly connectable to a second cell and for supplying fluid from the filling pod port and to the second cell, and an integral channel in fluid communication between the filling pod port, the first fluid supply member and the second fluid supply member. The channel includes a first channel portion in fluid communication between the filling pod port and the first fluid supply member and a second channel portion in fluid communication between the filling pod port and the second fluid supply member.

Abstract: A composition for prolonging battery life by reducing water loss and the degradation of properties due to dendritic precipitation, is refreshingly added to a battery electrolyte. By the refreshment of the composition, battery cycle life is substantially increased while degradation of the internal battery components is substantially reduced.

Abstract: A filling pod, a vehicle and a method for supplying fluid to a battery. The filling pod includes a filling pod housing having a filling pod port fluidly connectable to a fluid source for receiving fluid from the fluid source, a first fluid supply member fluidly connectable to a first cell and for supplying fluid from the filling pod port to the first cell, a second fluid supply member fluidly connectable to a second cell and for supplying fluid from the filling pod port and to the second cell, and an integral channel in fluid communication between the filling pod port, the first fluid supply member and the second fluid supply member. The channel includes a first channel portion in fluid communication between the filling pod port and the first fluid supply member and a second channel portion in fluid communication between the filling pod port and the second fluid supply member.

Abstract: Apparatus for filling the case (20) of a lead battery of the open type or of the sealed type with gas recombination, the case being filled with components for forming a gelled electrolyte, and the apparatus being characterized in that it comprises:

Abstract: In an air-metal fuel cell battery (FCB) system, wherein a movable cathode structure is mounted within a housing through which metal-fuel tape is transported along a predetermined path while an ionically-conductive medium is disposed between the metal-fuel tape and the movable cathode structure. In illustrative embodiments, the movable cathode structure is realized as a rotatable cathode cylinder, and a transportable cathode belt. The ionically-conductive medium is realized as a solid-state ionically-conductive film applied to the cathode structures and/or metal-fuel tape, as well as ionically-conductive belt structures.

Abstract: A composition for prolonging battery life by reducing water loss and the degradation of properties due to dendritic precipitation, is refreshingly added to a battery electrolyte. By the refreshment of the composition, battery cycle life is substantially increased while degradation of the internal battery components is substantially reduced.

Abstract: The invention relates to a battery which, for maintenance or in a danger situation, can be simply and reliably transferred from an operative state into a safe, inoperative state, whilst avoiding a short circuit. This is either brought about in that a controlled operable draining device for the rapid draining of the electrolyte is provided and that following the draining of the electrolyte all power-generating processes are stopped. Alternatively a battery with such characteristics is created in that in the danger situation a line introduces a deactivating substance into the electrolyte, which stops all power-generating, electrolytic processes.

Abstract: A circulation system for a flowing-electrolyte battery having at least one electrochemical cell, an anolyte reservoir, and a catholyte reservoir. The circulation system includes an anolyte pump coupled in fluid flowing relationship to the anolyte reservoir which pumps anolyte from the anolyte reservoir to the at least one electrochemical cell. A catholyte pump is coupled in fluid flowing relationship to the catholyte reservoir and also pumps catholyte to the at least one electrochemical cell. A second phase pump is coupled in fluid flowing relationship to the catholyte reservoir and is used to introduce second phase electrolyte into the aqueous catholyte pumped by the catholyte pump. The second phase pump is controlled by a controller so that the second phase is introduced into the catholyte stream in a metered fashion.

Abstract: A golf cart, powered by a plurality of electrolytic, lead-acid batteries has an on-board battery water replenishing system. Each battery includes a manifold that feeds water to each battery cell and is capable of transmitting out of the manifold gas generated during recharging. The watering system includes a water storage tank positioned above the batteries, with inlet and outlet tubing connecting each battery manifold to the tank in a separate, parallel circuit. The outlet tubing has a critical size of internal diameter (ID) to assure the formation of gas generated during recharging as bubbles in the outlet tubing so as to trap liquid between bubbles and to cause flow of liquid back to the tank. A one-way flow control valve is positioned in the inlet tubing to assure unidirectional flow. The outlet tubing ID must be less than ⅜ inch, with a preferred size being ¼ inch.

Abstract: Thermocells, also known as thermogalvanic electrochemical cells having one or more hot half-cells, electrolyte salt supplying reservoirs, porous inserts in the electrolyte conduits produce improved power output performance are disclosed.

Abstract: A lid for accumulator batteries has one or more holes to receive a device to ensure the circulation of electrolyte during the first charge and a second device to ensure the re-fill of electrolyte during the other charges. The lid is equipped with one or more channels each having one end facing the surface of the one or more holes and the opposite end coupled with at least one duct on the inner vertical wall of the container.

Abstract: For use with a valve regulated lead acid (VRLA) battery, a fluid fill system and a method of maintaining fill fluid in a VRLA battery. In one embodiment, the system includes: (1) a fluid determination circuit, associated with the battery, that determines a quantity of fill fluid in the VRLA battery and (2) a controller, coupled to the fluid determination circuit, that introduces replacement fill fluid into the VRLA battery based on the quantity to replace fill fluid lost from the VRLA battery. The fluid determination circuit comprises sensors that measure a temperature and pressure associated with the VRLA battery, and a state of a fluid release valve on the battery.