The Canon LP-E12 Lithium-Ion Battery Pack available at Lightbulb Rentals offers a 7.2V output and a capacity of 875mAh. It requires charging with the Battery Charger LC-E12 (rented separately).
D-Tap to LP-E6 Dummy Battery$5/day
IndiePRO Micro 26V (2) Battery Kit w/ Quad Charger$155/day
Meike Battery Grip-MK-7D for Canon EOS 7D MK I$8/day
Megawatt PowrBloc$15/day
LP-E8 Battery Charger$15/day
V-Mount Battery: Hypercore Pro-X (98Wh, 14.8v)$20/day
Sony NP-FZ100 Dummy Battery (Z-Series) to AC Adapter$8/day
Anton/Bauer Dionic-HCX Gold Mount Battery (120Wh, 14.4V)$30/day