Rechargeable LED Light / Torch From Old LiIon Battery

hi i made few rechargeable lights from cheap ebay components and LI-ion batteries from old electronics

1. charging board for LiIon battery

https://goo.gl/NVM6su

2. switch

3. some resistor (60Ω for single LED) and LED

(LED will get dimmer as battery voltage goes down)

3.1 or for constant brightnes you can use 5V step up

https://goo.gl/Aw2hCR

3.2 you can also use cheap USB LED light insted of making one

https://goo.gl/P62UiP

or one with touch switch

https://goo.gl/4ihBHP

4. battery

find some good Li-Ion battery

if you have flat battery from cell phone or something else is better to leave original protection board on it (it is hidden under tape or plastic part of the battery)

place your componnents as you want and mark it

i placed copper tape for less cable mess but you can use wires

then i connected them with solder on corners and isolated copper traces under components with some tape

glue components on place and cut some wires for connecting boards together

solder copper pads and board together and check connection with multimeter

i used cheap magnetic switch

as finnal step connect battery and chheck voltage and correct polarity

i left original protection board on battery and i probbably shorted it out during assembly that couse automatic protection disconnect battery from rest of the circuit

no worry for restart just plug it on charger for a second and it immediately self restart

test it :)

i added some hot glue on ends and LEDs and rap with heat shrink sleeve for waterproof seal

cut holes for LEDs and check for possible holes

if there aren't any air bubbles you have good seal

just for inspiration

(click for more images there are step by step photos)

here is full video with detailed steps if you are interested but not in english I'm sorry :(