Apparatuses, systems, and methods are disclosed for battery charging and power output. A system may include a plurality of hot-swappable, stackable slices for battery charging and power output. A slice may include communication circuitry for communication among the slices. A slice may include power input conversion circuitry, power storage circuitry, and/or power output conversion circuitry. A slice may include at least one electrical connector for connecting to a second slice. The at least one electrical connector may include connections for power and communications. A slice may include at least one mechanical connector for connecting to the second slice.