USB port charge battery MuVo n

Hello
I have a question about the USB port and rechargeable battery.
I use a rechargeable AAA battery in my MuVo N200.
I notice when my battery is near to dead and I connect my MuVo to the USB port of my PC, it's seem to recharge the battery.
The battery indicator show me full.
Is it possible that the USB port of my computer recharge my battery?
Is it normal?
Can this phenomena damage my MuVo?
Thanks for help

What's more likely is that when in the PC the player is using USB power and the battery is recovering a little. Alkalines do recover a tiny bit, particularly when warmed up, or so's the myth.

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