DIY USB Power Bank from Laptop Battery
http://www.doityourselfgadgets.com for further details!
This video shows a homemade fully working USB Power Bank for smartphones and USB devices. The batteries were recycled from an old Laptop Battery.
Links:
TP4056: http://www.dx.com/p/tp4056-4-2w-1-2a-...
USB Boost converter: http://www.dx.com/s/usb+boost
Toggle switch: http://www.dx.com/p/diy-3-pin-toggle-...
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Music:
www.machinimasound.com - Dance of the pixies
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