Patent ID: 9553466
Date: 2017-01-24
CPC Classifications: H01M,H02J,Y02E

Claim:
1. An electric power tool system comprising: a tool main body; a battery pack detachably attached to the tool main body and comprising at least one rechargeable battery; and a first charger configured to charge the battery pack, wherein the first charger comprises a first housing containing at least one rechargeable battery configured to supply charging current that charges the at least one rechargeable battery of the battery pack, wherein the first charger is configured to charge the battery pack while the battery pack is attached to the tool main body, wherein the at least one rechargeable battery of the first charger has a charge storage capacity that is larger than the charge storage capacity of the at least one rechargeable battery of the battery pack, and further comprising a second charger configured to charge the at least one rechargeable battery of the first charger, the second charger comprising a second housing containing a charging controller, the first housing being removably mountable on the second housing to charge the at least one rechargeable battery of the first charger.