Instructables

18650 iPod Touch 7805 Charger

If I had 2 18650 batteries (3.7V each in series = 7.4V) could I use a 7805 and a female usb connector to make a cheap iPod charger (iPod Touch)? I know that the 7805 will provide 5V @ 1A but is it efficient enough to charge the battery up a good amount? The last one I made I used a 9V battery (big mistake) but it just drained the ipod battery :( My question is do 18650 batteries provide enough current to charge an iPod Touch?

frollard4 years ago
You can, but you need resistors across the data pins to tell the ipod to charge. 18650 provides PLENTY of juice.

http://hackaday.com/2010/08/03/reverse-engineering-apples-recharging-scheme/
I would also recommend trying out a mintyboost circuit bump the 3.7 up to 5 volts.  That way, you're not burning 30% of your energy (2.4 of the 7.4 volts) off as heat in the regulator.  Then you could run the 2 18650's in parallel to have longer run time.
u will need resistors on the data pins to tell the iphone to charge.

click here for the minty boost : http://www.ladyada.net/make/mintyboost/icharge.html
ARJOON4 years ago
i have tried it it w9n't w9ork 9well. it w9ill either s3ay that there i3s an e*xernal pow9er 3source or 9will charge a few minutes3 and then s3ay that its3 charged but the ipod is3 not charged
You might want to fix or replace that keyboard...
yeah but i have no money to buy s3ome batterie3s for my w9ireles33s keyboard s3o i am u3sing an old olivetti keyboard for no9w
Dr. Pepper4 years ago
I would be careful of putting random charges through your ipod. It happened to me and I bricked my ipod so bad Apple had a hard time fixing it.