The PRB-7 is a 12-Volt Starved Electrolyte 2 Pocket Battery Belt. The PRB-7 contains an auto reset circuit breaker. The Quick release belt fits 28 to 50 inch waist. This version Requires Charger, which is not included.
I use it on a ProAim Pan/Tilt Remote Head (on a ProAm crane). The battery last over 10 hours of intermittent use.
It has been used in oceanic environments and did pass the muster without any damage.