FIELD: electricity.
SUBSTANCE: electric tool is powered by a plurality of battery packs connected in series. The electric tool has a controller adapted to receive signals transmitted from integrated circuits located in each of the battery packs. Between the controller of the electric tool and one of the integrated circuits of the battery packs, there is a voltage level shift circuit for shifting the voltage level of the signal transmitted from the corresponding integrated circuit to the controller of the tool to an acceptable level for the controller.
EFFECT: providing an autostop function for the electric tool by providing communication between different integrated circuits of battery packs and the controller of the electric tool.
26 cl, 22 dwg
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