The Hensel may be overkill. It is not actually a battery with outlets, it is a battery and a DC to AC inverter. How large a load do you need to run for how long?
More details needed. What is expected total power draw, duration, budget, light source type constraints? You can get a marine deep-cycle battery and a $30 inverter for an operation involving a few hundred watts and running for an hour or two, and it starts going up from there.