This Power Bank Has 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 4pcs 18650 battery cell maximum. You can connect one battery also. Battery should be 18650 Lithium Ion model.
Circuit has Double USB charging port with 2A and 1A output. LED facility , on/off switch.
4 cells Power Bank Case Spring System
1 x Circuit
1 X Power Bank Case