A system including a power tool, a device, one or more battery packs, a battery pack bank, and an adaptor. The power tool has a power tool battery receptacle. The device is wearable by a user and has a first device battery receptacle and a second device battery receptacle. The one or more battery packs are received by at least one selected from a group of the power tool battery receptacle, the first device battery receptacle, and the second device battery receptacle. The battery pack bank is on the device. The adaptor includes a user interface and an adapter interface, the adapter interface is received by the power tool battery receptacle, the adapter configured to supply power, via the first device battery receptacle, when the user interface is in a first mode, and supply power, via the second device battery receptacle, when the user interface is in a second mode.