Battery pack, power tool and battery pack charger system

A battery pack comprising:

• a set of battery cells, the set of battery cells including a first subset and a second subset of battery cells and a pack control module, a set of switches coupled to the set of battery cells, a first switch of the set of switches coupled between a positive node of the first subset of battery cells and an AC output port and a second switch of the set of switches coupled between the AC output port and a negative node of the second subset of battery cells, the first subset and the second subset of battery cells sequentially coupled to the AC output port by the set of switches to provide an AC power signal at the AC output port, the first subset of battery cells solely providing a positive signal portion of the AC power signal at the AC output port and the second subset of battery cells solely providing a negative signal portion of the AC power signal at the AC output port.