LiFePO4 batteries are highly safe, have no risk of explosion and fire, and are environmentally friendly, non-toxic and non-polluting. No memory effect - the battery can be charged in any state of discharge, giving you peace of mind. Nominal Voltage:3.2V Nominal capacity:20Ah Working voltage:2.0V~3.9V AC impedance resistance(1khz):≤5.5mΩ Max. pulse charge / discharge current: 40A Dimension: 134(L)*70(W)*29(T)mm Weight: 0.5kg(No accessories)