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Charging rechargable battery using USB?

New here and I have a question. I was building a NES MP3 player and everything is going fine until I got to the battery part. At the moment, it current uses normal nonrechargable AAA battery to power it but I was wondering if it's even possible to put in a rechargable battery in there and wire it up to the USB port so that plugging it into the USB will recharge the battery? If so, how do I do it? Thanks in advance

i can't find any chips from microchip or maxim-dallas that can charge 1.5v batteries with usb if you need 3.6v then you can get one that is meant for charging lithium ion cells with the usb, you can also reduce the voltage with a regulator
Incostel (author)  frank260801159 years ago
That's nice to hear. Is there a guide to make it or can I just buy from somewhere? Is it difficult to contruct it yourself?
the diagram is shown http://www.maxim-ic.com/quick_view2.cfm/qv_pk/4002

all you really need is three of the five pins of the chip, also two capacitors

it's a tiny chip though, you need to be good at soldering