Dual Micro USB 3.7v to 5V 2A Mobile Power Bank DIY 18650 Lithium Battery Charger PCB Board Boost Step Up Module

Features: 100% high quality and branded 18650 Dual Micro USB 3.7V to 5V 2A Boost Mobile Power Bank DIY 18650 Lithium li-ion battery dual micro usb booster board feature LED lights show the power, non-working state of intelligent automatic shutdown; Dual USB output. Built-in lithium battery protection IC, over-current, overvoltage, undervoltage protection; 18650 Lithium li-ion battery dual micro usb booster board parameter Input port: MicroUSB (Andrews mouth) Input requirements: 5V constant voltage power supply can be done to charge the input power supply, the most matching charger for 5V1A above Output port: USB Output parameters: 5V1A/5V2A Size : 8 X 32 X 69 mm (H*W*L) Working battery: 18650 battery, cell phone battery, flat battery, MP3 battery, etc. 3.7V-4.2V polymer lithium battery can be single section (chip) power supply, can also be multi-section (chip) parallel power supply (not in series, not in series ). (Note: increase the capacity in parallel, the series is to increase the voltage, can only be used in parallel!) Can be parallel 2-6 18650 battery. Not Working Battery: dry batteries, batteries, 1.2V rechargeable batteries, nickel-metal hydride batteries, 3.2V lithium iron polymer lithium batteries. Note: the battery should be in parallel, the voltage between 3.2-4.2V to work, 18650 flat and polymer batteries can be; the battery is connected to the motherboard B negative access B-, installed anti-burning motherboard; the old and new batteries, models, inconsistent battery brand can not be mixed.