RandoPowerbank

one week energy for my mobile/gps/MP3....

Li-Po battery from useless laptop,electronic circuit from old powerbank,wires,scotch......

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