CHEERSON HOBBYTIGER 3.7V 1200mAh Lipo Battery 25C ( 5PCS ) + 5 in 1 Batteries Charger for SYMA X5HW X5HC RC Quadcopter Applicable to Syma X5HW X5HC RC quadcopter.Due to utmost capacity,a little bit tight to battery compartment,suggested modification as picture shows. Safety:Over charge protection and short circuit protection 5-in-1 charger.This charger has a power management IC and the protection voltage is 4.0V0.1V.Normally, the led light will turn off when the voltage is over 4.0v.If the led light starts flashing, it means that the battery is close to fully charged and the voltage is around 4.0v.This phenomenon often occurs to nearly fully charged batteries, exhausted batteries will not have this problem. Guaranteed 12-15 min flight time(test by customer),high drain lithium-polymer rechargeable battery HOBBYTIGER 5-Port Charger can charge up to 5 packs (3.7V Batteries) at the same time.Cool down the battery before your next flight or recharge. Battery size:5.4x2.9x0.8cm, (2.1"*1.1"*0.3") (Lx WxH)