3pcs 3.7V To 5V 1A 2A Boost Module DIY Power Bank Mainboard Circuit Board Built In 18650 Lithium Battery Protection IC D

Features 1 4 level LED lights show electricity non working state smart automatic shutdown 2 Built in lithium battery protection IC overcurrent overvoltage undervoltage protection 3 Dual USB output 4 Motherboard size 69 x 32 x 8mm L x W x H Product basic parameters Input port Micro USB Android port Input requirements 5V constant voltage power supply can be used for charging input power the most matching charger is 5V 1A or moreOutput port USBOutput parameters 5V 1A 5V 2ARequirements for rechargeable batteries Available battery 3 7V 4 2V polymer lithium battery 18650 battery mobile phone battery flat battery MP3 battery can choose single cell power supply or multiple cell parallel power supply does not support the series Note increasing capacity in parallel and increasing voltage in series can only be used in parallel Can be connected in parallel with 2 6 pcs 18650 batteries Batteries are not available Dry cells batteries 1 2V rechargeable batteries nickel hydrogen batteries 3 2V iron lithium polymers lithium batteries etc Product installation should pay attention to the following points 1 The battery should be connected in parallel only the voltage between 3 2 4 2V can work 18650 flat head and polymer batteries are available 2 The battery is connected to the motherboard B stands for the positive pole B stands for the negative pole if its connected reversely will burn the motherboard 3 The old batteries and new batteries the