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AssigneesMakita Corporation, Hondas Giken Kogyo Kabushiki
InventorsShinichi Nakane, Yutaka Matsunaga, Tomoo Muramatsu, Kazuyoshi Horikawa
Estimating the term…
An improved charging system for preventing battery deterioration and for accurate indication of the remaining battery charge level includes an electric power tool (2) and a charger (1). The electric power tool (2) is provided with an internal rechargeable batteries (6) and a second controller (9). The charger (1) is provided with circuitry for charging, a microcomputer (19), and discharge circuitry which is comprised of a manually-operated battery refreshing button (25), a discharge relay (23) and a discharge resistor (24). Upon depression of the battery refreshing button (25), the microcomputer (19) causes the batteries (6) of the electric power tool (2) to be charged to a full level and discharged to a predetermined level twice. When the two-cycle operation of full charge and discharge is completed, the second controller (9) of the electric power tool (2) updates the remaining charge level of the batteries (6).
A power tool charging system, comprising:
A method for charging an electric power tool including at least one rechargeable battery on which the electric power tool operates, said method comprising the step of cycling the at least one battery through at least one cycle of charging the at least one battery fully and discharging the at least one battery to a predetermined level.
A method for monitoring the charge level of an electric power tool including at least one rechargeable battery on which the electric power tool operates, said method comprising the steps of
Dependencies are inferred from the claim text.