HOBBYTIGER 3.7V 1200mAh Lipo Battery 25C (5PCS) + 5 in 1 Batteries Charger for SYMA X5SW X5SC CX-30W RC Quadcopter Drone Replacement 5 replace batteries,extended flying time,got a bang out flying your quad.1 USB charger,charge 5 batteries meanwhile,less charging time. 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. Upgraded battery provides 1200mah high capacity,safer and higher performance Light weight and easy carry,put in your pocket when flying X5S series drone outdoors.Doesn't fit with SYMA X5C A little bit tight to syma x5sw battery compartment,suggested modification as picture shows.