A battery input receives a power discharge from a first battery of a local device. A controllable charging circuit generates a charging signal based on the power discharge, a charge status of the first battery, a charge status of one or more second battery for at least one of one or more external devices, and a load balancing plan associated with the local device and at least one of the one or more external devices. A charging output to route the charging signal to at least one of the one or more external devices.