Shorai LFM Lithium-iron Battery w/BMS,LFM19A4-BS12, 6.4Ah 13.2V, 84.5WHr, "A" Type, Case 4. Shorai Batteries require a charging system output of 13.1 Volts or higher at idle, and must not exceed 15.2 volts at maximum output. Due to transport regulations, all batteries are shipped at 30% SOC (State of charge). Please fully charge the battery before use.