credit card sized phone charger

thingiverse

i wanted a charger that fits my wallet it uses a samsung galaxy mini battery (i had an old phone lying around) it uses the circuit from the aluminium cylinder portable chargers that use 18650 batteries i removed the large usb plug and soldered the wire to the phone directly to the board, join the green and white wires together (use the cable that fits your phone, i used a micro usb) remove the label of the battery and solder wires directly to the protection board, the gold contacts may come off depending on the battery, you dont need them i used hot glue to hold the case together, id use a runnier glue like ca glue next time i printed in clear so i can see the status leds print in 0.3mm layer height the top and bottom panels are 0.6mm thick use this for the charger circuit but remove the usb a port and use the cable of your choice there might be other chargers with circuits that would fit but im not 100% sure http://www.ebay.com.au/itm/Aluminum-USB-Power-Bank-DIY-Case-Box-Kit-for-1X-18650-Battery-Charger-Cell-Phone-/272605336752?var=&hash=item3f788b54b0:m:mQhZ5VGsh0CLLoo0J2KZJiw use this (or equivalent) battery http://www.ebay.com.au/itm/Battery-For-Samsung-Galaxy-s4-mini-GT-i9195T-/301576442055?hash=item46375b50c7:g:X9cAAOSwBLlVFfu8