I'm working on a project that involves incorporating a battery storage unit within a military, police, or PMC spec assault rifle for field usage. I'm trying to devise a way to extend the life of use by cycling a charge back into the deep cycle battery. I want to use thermal photovoltaics to assist with that. During usage the barrel would heat up and that's what I'm hoping to use to extend the charge even longer. So would the TPV cell become damaged from this type of usage, barrel shock during firing (single, burst, and full auto), also the heat factor (it wouldn't be consistent (factoring in external weather - desert, and cold weather)?