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How to make a Smart-Charger??

I was wondering if anyone knew how to make a smart charger for my cell phone so the charger turns off after my battery reaches a certain level. Help. Thanks.

wkuace7 years ago
i'm almost certian that phones have their own smart chargers built in. I have opened up some car chargers and they are pretty much just a 7805 and other components (just a 12v to 5v converter) so the phones must control the charging.
That being said i'm not responsible if you destroy your phone, good luck
lemonie7 years ago
Yes, people do, but you need to be careful. How good are you with a soldering-iron and electronics?

L
jules15 (author)  lemonie7 years ago
pretty good
orksecurity7 years ago
Regarding why you want to be careful: See https://www.instructables.com/answers/How-can-I-recharge-37v-Li-ion-batteries-from-cell/

Question: Doesn't the phone already contain a smart charger? I haven't seen one that will overcharge its battery...