3.7V 600 mAH Lipo Rechargeable Battery for RC Drone

It is 18650 Mobile power bank Battery Charge, Discharge, Protection & Boost Circuit board module.You can make your own power bank using this module. It can charge up to 4 batteries in parallel.Can show the battery charge & discharge status with two mode on-board LED’.(Blink& Standby)Module comes with protection function, Overcharge protection, Over-discharge protection, Over current protection.Intelligent Overcharge protection system automatically stops charging once the connected device is fully charged. Stable Output voltage and current.