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Usb power bank/charger

I have one of these and it works great! However be AWARE.... there are some models around which use a questionable controller chip... some versions over drain the battery, others over charge but there all look the same case-wise, you only know when you check the PCB inside.

Sorry I can't find the thread right now but on some other forum there is a 10 page thread on these things, think its on a flashlight forum. Just google "power bank 18650" or something, you'll find it.

As for mine, I snipped off all the clips on the lid, glued some super small rare earth magnets to it and now it works great. I took the clips off as you will near wreck the thing getting the lid off!
 
Schematics

Hello geniuses...

Does anyone know what the Circuit schematics for this would be, doing someone similar for a college project, would help a lot if anyone knew.

Thanks all.
 
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