Keenso Boost Converter Module, DC-DC Boost Converter, 5V Output, 2.1A Current, Step-Up Voltage, USB Power Supply for Mobile Power, Charger Board, DIY Projects, Outdoor Activities, Emergency Backup

Keenso-- 5V/2.1A Output UPS DIY Charger Board Voltage Step-up DC-DC Converter Boost Module. Specification: voltage: DC5V(4.6V-6.5V) Charging current: 0-1A Full voltage: 4.2V+-2% Discharge current: 0-3.5A Discharge quiescent current: 200uA Discharge 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.