... of the capacity available (50%--60% for lead-acid battery).2. Green and environmental, no containing acid and ... specific capacity, with higher capacity than lead- acid battery with same size.4. High cell discharge platform, ... 1/3 of the lead-acid battery, no need to add water, avoid maintenance completely.9. Safe and reliable, ... , over charge and over discharge. 12V 4.5Ah Lithium polymer UPS battery