Abstract: A battery pack for use with a battery-driven power tool includes three battery cells in which two out of three are arranged horizontally in parallel to and in alignment with each other in a lower case and the remaining one battery cell is vertically arranged in an upper case. The upper case of the battery pack is inserted, in use, into a battery pack receiving space formed in the grip portion of a power tool. Therefore, the grip portion can be made thin and usability of the power tool is enhanced.

Abstract: A battery pack 10 includes a housing 11, a group of cells 12, a board 13, a plurality of second terminals 14, and a cover 15. An opening 16c is formed in the housing 11. The board 13 has a terminal arranging part 13A. A plurality of the second terminals 14 are arranged on the terminal arranging part 13A of the board 13. The cover 15 has a plate-like shape, and covers an area of the board 13 which is positioned between the terminal arranging part 13A and the opening 16c.

Abstract: A power tool includes: a handle housing housing a battery and having a first grip part; a motor driven by electric power of the battery; a power transmission system; a main housing housing the handle housing, the motor and the power transmission system and having a second grip part; and a turning mechanism turnably connected at a rear end part of the main housing and a front end part of the handle housing. The power tool is operable at least in a state that the main housing and the handle housing are disposed straight and a state that they are disposed to be folded. In the folded state, the second grip part is positioned in front of the first grip part in an axial direction of the main housing. A trigger and a forward/reverse switch that control the rotation of the motor are disposed on the handle housing side.

Abstract: A battery pack includes a plurality of lithium battery cells, an analog thermo sensing member, and an analog switch. The analog thermo sensing member detects, in an analog form, a battery temperature of at least one of the plurality of lithium battery cells, and outputs an output preventing signal if the battery temperature is over a first predetermined temperature. The analog switch element is the plurality of lithium battery cells in series, and is switched, based on the output preventing signal, to a state in which a current is prevented from flowing in the plurality of lithium battery cells.

Abstract: A battery pack includes a chargeable battery, a battery voltage detecting section, and a determining section. The battery voltage detecting section is configured to detect a battery voltage output from the rechargeable battery. The determining section is configured to determine a voltage level status of the rechargeable battery based on the battery voltage detected by the battery voltage detecting section. The determining section is free from determining the voltage level status when a rate of change in the battery voltage is equal to or greater than a predetermined criteria. Such a battery pack is used for a power tool.

Abstract: A battery pack 10 includes a housing 11, a group of cells 12, a board 13, a plurality of second terminals 14, and a cover 15. An opening 16c is formed in the housing 11. The board 13 has a terminal arranging part 13A. A plurality of the second terminals 14 are arranged on the terminal arranging part 13A of the board 13. The cover 15 has a plate-like shape, and covers an area of the board 13 which is positioned between the terminal arranging part 13A and the opening 16c.

Abstract: A battery pack (10) includes a housing (11), a group of cells (12), a board (13), a plurality of second terminals (14), and a cover (15). An opening (16c) is formed in the housing (11). The board (13) has a terminal arranging part (13A). A plurality of the second terminals (14) are arranged on the terminal arranging part (13A) of the board (13). The cover (15) has a plate-like shape, and covers an area of the board (13) which is positioned between the terminal arranging part (13A) and the opening (16c).

Abstract: According to an aspect of the present invention, there is provided a battery pack to be inserted and attached to a power tool, including: a case; a battery cell accommodated inside the case; and an electrode terminal connected to the battery cell and provided on the case so as to be connectable to a tool-side electrode terminal, wherein the case includes: a case main portion; and a case sub portion which is protruded from the case main portion to be inserted into the power tool, and wherein the electrode terminal is provided on an upper surface of the case main portion at a side of the case sub portion.

Abstract: A battery pack (10) includes a housing (11), a group of cells (12), a board (13), a plurality of second terminals (14), and a cover (15). An opening (16c) is formed in the housing (11). The board (13) has a terminal arranging part (13A). A plurality of the second terminals (14) are arranged on the terminal arranging part (13A) of the board (13). The cover (15) has a plate-like shape, and covers an area of the board (13) which is positioned between the terminal arranging part (13A) and the opening (16c).

Abstract: A battery pack for use with a battery-driven power tool includes three battery cells in which two out of three are arranged horizontally in parallel to and in alignment with each other in a lower case and the remaining one battery cell is vertically arranged in an upper case. The upper case of the battery pack is inserted, in use, into a battery pack receiving space formed in the grip portion of a power tool. Therefore, the grip portion can be made thin and usability of the power tool is enhanced.

Abstract: The problem of the present invention is to configure a battery charger such that water intruded into a gap between a plugging portion of a battery connection part in the battery charger and a battery pack does not contact the circuit substrate, with a simple and low-cost configuration, and improving recyclability of the circuit substrate. The battery charger is configured such that water intruded from the gap between the plugging portion of the battery connection portion and the battery pack, is guided through a through-hole of a protruded portion provided at the bottom of the plugging portion to the lower side of the circuit substrate provided on the bottom case.

Abstract: A battery charger capable of improving a visibility to a light emitting display portion for facilitating recognition of a charge state of a battery. The battery charger has a housing and a display unit including the light emitting portion protruding from an outer surface of the housing.

Abstract: A battery pack includes a plurality of lithium battery cells, an analog thermo sensing member, and an analog switch. The analog thermo sensing member detects, in an analog form, a battery temperature of at least one of the plurality of lithium battery cells, and outputs an output preventing signal if the battery temperature is over a first predetermined temperature. The analog switch element is the plurality of lithium battery cells in series, and is switched, based on the output preventing signal, to a state in which a current is prevented from flowing in the plurality of lithium battery cells.