one week energy for my mobile/gps/MP3....
Step 1: Stuff
Li-Po battery from useless laptop,electronic circuit from old powerbank,wires,scotch......
Step 2: Connect All Parts
i build a pack batteries and i connect the electronic circuit.
This Powerbank have 15.400 mAh
seven batteries 2200 mAh connected in parallel
output max is 2A 5Volt USB
two days need for charging but you can use the powerbank for 10 days or above for all you need.
Thank you to watch