the output is probably a standard usb charging circuit if it's rated at 4.2V (especially since most LI-rechargeable batteries take their charge at 4.2V).
while more details are needed, the input being 5V Dc makes me think it's a usb connection. probably requires an adapter to fit on a NEMA 5-15 line.
One more thing the Output: DC 4.2V 420mA means you should not charge a battery smaller than 420mA. It's ok to use for a larger lithium battery but it will take longer to charge. I also would not risk connecting it to an expensive computer. If something goes wrong with your battery the computer can be fried. a usb wall wart is a lot cheaper.
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