Abstract: A battery pack in one aspect of the present disclosure includes a battery and a controller provided with a counter value. During discharge of the battery pack, the controller calculates an addition value in accordance with a total number of use of the battery pack under a specified condition. The controller updates the counter value by adding the addition value. The controller prohibits the discharge of the battery pack in response to the counter value reaching a protection threshold.

Abstract: A battery pack includes a battery, a coupling portion, a connection determiner, a receiver, and a prohibition range controller. The prohibition range controller varies a prohibition range depending on the connection or non-connection of the electric work machine that is determined by the connection determiner, or the specification of the electric work machine connected to the coupling portion. The prohibition range is defined by a current range and a voltage range. A discharge from the battery is prohibited in the prohibition range.

Abstract: A battery pack in one aspect of the present disclosure includes a battery and a controller provided with a counter value. During discharge of the battery pack, the controller calculates an addition value in accordance with a total number of use of the battery pack under a specified condition. The controller updates the counter value by adding the addition value. The controller prohibits the discharge of the battery pack in response to the counter value reaching a protection threshold.

Abstract: A system in one aspect of the present disclosure includes a battery pack and an electric work machine. The battery pack includes a battery, a first interface, a first memory and a first controller. The first controller is configured to transmit battery data identifying a type of the battery pack. The electric work machine includes a motor, a second interface, a switching element, a manual switch, a second memory and a second controller. The second controller is configured to transmit electric apparatus data identifying a type of the electric work machine.

Abstract: A battery pack according to one aspect of the present disclosure includes an attaching portion, a battery, a voltage detection circuit, a current acquisition circuit, a next current calculation circuit, a first charging stop circuit, and a second charging stop circuit. The attaching portion is electrically and mechanically connected to the battery charger. The first charging stop circuit stops charging of the battery in response to a first condition being satisfied. The second charging stop circuit stops the charging of the battery in response to a second condition different from the first condition being satisfied.

Abstract: A battery pack is configured to supply electric power to an electric work machine, such as a power tool or outdoor power equipment. The battery pack includes a first battery-signal terminal and a second battery-signal terminal. The first battery-signal terminal outputs, to the electric work machine, a first signal indicating that discharging is to be prohibited or permitted. The second battery-signal terminal outputs, to the electric work machine, a second signal indicating that discharging is to be prohibited or permitted. Thus, two communication paths are provided for transmitting signals to permit or prohibit discharging of the battery pack.

Abstract: A power supply system includes a wearing part worn on a hand of a worker, a connecting member held by the wearing part, and a control circuit. The connecting member is disposed at a position where it is attached to a tool-side attachment part provided on a grip of a power tool when the worker grips the grip. The connecting member includes, in an exposed manner, a power source terminal that supplies electric power to the power tool and a signal terminal that receives a response signal from the power tool, which are electrically connected to the power tool in an attached state where the connecting member is attached to the tool-side attachment part. The control circuit makes the power source terminal and a power source unit electrically continuous when the signal terminal receives the response signal and makes them electrically discontinuous when the signal terminal receives no response signal.

Abstract: A battery pack in one aspect of the present disclosure includes a battery and a controller provided with a counter value. During discharge of the battery pack, the controller calculates an addition value in accordance with a total number of use of the battery pack under a specified condition. The controller updates the counter value by adding the addition value. The controller prohibits the discharge of the battery pack in response to the counter value reaching a protection threshold.

Abstract: A battery pack (60), which is rechargeable by a charger (600), includes one or more battery cells (60), a control part (620), a communication part (620, 400, 15), and a switching-control part (620). The control part is configured to be switchable to any of a plurality of operation states, including a controlled-operation state and a low-power operation state. The switching-control part: compares a communication-stop time (Ta1) to a state-switching determination value (Tth1); does not switch the operation state of the control part if the communication-stop time is less than or equal to the state-switching determination value; and does switch the operation state of the control part to the low-power operation state if the communication-stop time exceeds the state-switching determination value, whereby power consumption of the control part can be reduced upon completion, e.g., of a charging operation.

Abstract: A power supply system includes a wearing part worn on a hand of a worker, a connecting member held by the wearing part, and a control circuit. The connecting member is disposed at a position where it is attached to a tool-side attachment part provided on a grip of a power tool when the worker grips the grip. The connecting member includes, in an exposed manner, a power source terminal that supplies electric power to the power tool and a signal terminal that receives a response signal from the power tool, which are electrically connected to the power tool in an attached state where the connecting member is attached to the tool-side attachment part. The control circuit makes the power source terminal and a power source unit electrically continuous when the signal terminal receives the response signal and makes them electrically discontinuous when the signal terminal receives no response signal.

Abstract: An image forming apparatus includes a memory and circuitry. The memory is configured to store a status of the image forming apparatus and a first detected density value obtained in a first tone correction based on a dither pattern. The circuitry is configured to calculate a difference between the status of the image forming apparatus upon the first tone correction and the status of the image forming apparatus upon a second tone correction following the first tone correction. The circuitry is further configured to calculate a correction value according to the difference in the status of the image forming apparatus, based on the first detected density value and a second detected density value obtained in the second tone correction based on a reference pattern.

Abstract: An image forming apparatus includes a memory and circuitry. The memory is configured to store a status of the image forming apparatus and a first detected density value obtained in a first tone correction based on a dither pattern. The circuitry is configured to calculate a difference between the status of the image forming apparatus upon the first tone correction and the status of the image forming apparatus upon a second tone correction following the first tone correction. The circuitry is further configured to calculate a correction value according to the difference in the status of the image forming apparatus, based on the first detected density value and a second detected density value obtained in the second tone correction based on a reference pattern.