Dual USB 3.7v to 5V 2A,1A Mobile Power Bank DIY 18650 Lithium Battery Charger Module With Led voltage level,charging indications. This is the mobile power module Accessories, 18650 Circuit board shell. Better option for DIY power banks, but you must understand basic electronic assembly.
- Batteries to parallel, the voltage in 3.2-4.2V can work between, 18650 flat and polymer battery can be.
- The battery is connected to the motherboard B + negative-, installed against the necessary burning motherboard.
- New and old batteries, model brand inconsistent batteries cannot be mixed.