Tenergy Combo 1-4 Cells Li-PO/Li-Fe Balance Charger + 11.1v 1600mAh 20C Nunchuck LiPO Airsoft Battery Pack Battery charger has built-in balancer. Batteries are automatically balanced during charging, ensuring full charge Charger fits 1S to 4S Li-PO/Li-Fe battery packs with XH type balance connector Charge Rate: 1A (1,000mah per hour) 11.1v 1600mAh 20C Nunchuck LiPO Airsoft Battery Pack 11.1v Li-Po battery can deliver more power than 12v Ni-MH large type battery with only half of the size