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homemade airsoft battery charger

 my friend is gonna sell me a smg for 15 dollars but without the charger. the battery is 4.8V and 400Mah.
so i was wondering if i switch its plugs on it and a usb cable that i can charge it
computer usb=    5V   500Mah------- to the batery-------4.8V   400Mah= battery
can i use this effectively 

Re-design7 years ago
Yes, if it really is only 400 mah.  You still stand a chance of destroying your computer mb.

Better solution is to get to radio shack and buy a 6 volt 500 mah wall wart for about 15$ and not risk ruining your motherboard.