Step Up Module, Boost Converter Module 3.7V to 5V 1A Li-ion Battery Voltage Step Up Converter Boost USB Charger Power Supply Module

Features: 100% brand new and high quality. This module supports cell phones that need to identify charging or devices which need 5V1A power supply. It has li-ion battery protection, over-charge and over-discharge protection. The static current is very small, not need to add external switch. The module can be powered by 18650 li-ion battery, 3.7V cell phone battery, can be single battery or many batteries in parallel. Specification: Charging Input: 5V1A Input Interface: Micro USB socket Discharge Output: 5V1A Output interface: Standard USB socket Indicator Light: Charging--red;  fully charged--green; load--blue Weight: 10g / 0.4oz (approx.) Note: Do not use dry cell battery, storage battery, 12V rechargeable battery, NI-MH battery, LiFePO4 polymer battery; battery should not be used in series connection. For first time power no output, it need to input 5V by micro USB to activate while connecting to battery. Activated again if the battery has been disconnected from module. The battery input positive and negative polarity must be connected correctly, please check the battery polarity first then connect.