Prowans Power Bank Circuit Board Assembly Module Kit, 5V Micro USB Input for Charging Electronic Components Electronic Hobby Kit

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 an on-board LED. 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.