Rechargeable Li-ion battery pack built to the same form factor as a Canon LP-E6 cell, giving the SinoGnss T300 receiver (and its SE/Plus variants) a hot-swappable, consumer-grade power source that is easy to source and replace in the field. Two of these packs run the receiver for roughly 9-10 hours combined, and a status LED on the receiver flashes when a pack is running low.