Power Converter 5V/2.1A Output UPS Power Supply DIY Board Charger Board Voltage Step-up DC-DC Converter Boost Module

Specification:Charge voltage: DC5V(4.6V-6.5V)Charging current: 0-1A Full charge voltage: 4.2V+-2% Discharge current: 0-3.5ADischarge quiescent current: 200uADischarge conversion efficiency: 78%-91%Output current: 0-2.1A(5V)Operating ambient temperature :  -40° to +85°Storage temperature:  -65° to +125°Size: 28*18*6.3mm / 1.1*0.7*0.2in Weight: 3g / 0.1oz (approx.) Package list: 1 * Module Note : 1, This module without lithium battery over-discharge protection. 2, In order to achieve more than 5W, it is recommended to use two or more batteries in parallel.