KOOBOOK 1Pcs 5V 1A USB Power Bank Charger Module 18650 Lithium Battery Charging PCB Board DIY

Specifications: Four-light indication mode, more accurate indication of battery power, with battery low-voltage reminder function; Fixed switching frequency 1MHZ; Battery overcharge, over discharge protection; Precautions: The battery must be connected in parallel rather than in series.Pre-test before the next voltage. As long as a bad battery will affect the entire group of batteries.Clear positive and negative. Once wrong,the motherboard and IC will be destroyed. The exposed part of the wiring to be wrapped to avoid aluminum The shell hits the board and damages the board. We highly appreciate all customers opinions to improve the selling, also if anything you unsatisfied, please contact us for probable best solution. Package Includes: 1Pcs