Charging canon NB-4L battery over USB.

So im on vacation with my camera, but i forgot my charger. The battery is rated at 3.7 volts and 760 mAh. My charger outputs 4.2 volts. My question is, would 5 volts from a USB port be too much for a makeshift charger?

Yes. 5V could burn out the charge circuit or overload the battery.
Ancient15 years ago
KABOOM
'nuff said