12V 105Ah electric vehicle power supply systems are a popular option. Rated at 12V with an amp hour rating of 105A, such a system could deliver 12 volts for up to 105 hours at 1 amp under ideal conditions - meaning they could provide power for moderate energy requirements like small electric or hybrid vehicles; such systems often utilize lead-acid or lithium-ion technology as these provide optimal balance of cost, energy density and longevity.