... acid and heavy metal such as lead, cadmium and Hg.3. High density of energy, high specific capacity, with higher ... discharge rate, only 1/20 of the lead-acid-battery.7. Fast charge, 18 times of the lead-acid battery. ... 8. Light weight, only 1/3 of the lead-acid battery, no need to add water ... current, short-circuit, over charge and over discharge. 12V Li polymer battery for UPS