This Power Bank Hase spring type System. Means no need of soldering any more. Just press the spring and fit your battery. Power bank ready to charge your phone. You can use 2 18650 battery cell maximum. You can connect one battery also. Battery should be 18650 Lithium Ion model.
Circuit has Single USB type with 1A charging Current.
2 Cell Power Bank Case Spring System
1 x Single Usb Circuit
1 X Power Bank Case