This video shows you how to upgrade your 2600mAh powerbank to 5000mAh. This is for the popular 2600mAh keychain powerbank found in eBay. You don't need a rocket scientist brain to do this!!!! :P
Warning! quick solder on battery terminal. Li-Ion battery can explode when expose to heat for long period of time. Best is to discharge the battery and wear safety glass.
What you need?
1. Soldering iron and flux
2. 5000mAh 18650 battery ($10 or less in eBay)
3. Precision screw driver or pryer
Step 1: Open the cover by create a small opening at the side and then insert pryer or precision screw driver to gently snap open the cover.
Step 2: Remove the internal battery and the USB circuit board from the holder. Check and remember the terminal wire colour (red wire for + and black wire for -)
Step 3: Unsolder the wire attached to the internal battery. Then solder the wire onto the new battery. Make sure the terminal is correct.
Step 4: Check the circuit by charging it and charge a usb device. If all well, close the cover. If all fails, check the wiring.
There you go, you have upgraded your 2600mAh powerbank to 5000mAh.