This got me thinking about using a USB wall wart or powered hub to recharge some of my lower mAH devices. In reading Azmaria's battery pack sticky and some of the recharge port threads, it seems that the conventional wisdom is to buy a smart charger and use unprotected, matched lion cells. Perhaps because of the analog nature of the protection boards, and also because of the high capacity making USB non-viable.
I don't have a battery pack, just a single 16340 at about 550 mAh. It is protected. Could I safely plug it into a USB wall wart charger, say one with output of DC5.00±0.02V DC300±50mA? Would the PCB of the battery do the work and cut itself off? Is 5V okay voltage to feed a 3.7V cell?
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