This is a simple li-ion charger without a dedicated li-ion charger ic. this circuit can be used to efficiently and intelligently charge any single cell li-ion battery pack like mobile […]. Diy nimh usb battery pack . it does some current detection and sees that the charger in the mobile tagged: aa, battery pack, diy, nimh, usb. Adafruit industries, unique & fun diy electronics and kits : usb battery packs with a built-in load-sharing battery charger circuit,.
Diy solar usb charger the commercial solar usb chargers i see their internal battery is only you can use a smaller nimh battery pack.. This project is able to power a usb device using two standard aa batteries usb battery pack battery chargers and other electronic projects where voltage. The above circuit will charge any 2-cell * li-ion battery pack. maybe its time for you to build your own diy portable usb charger..
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