Is it possible to recharge the Olympus FE-20 digital camera battery with a USB cable?

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Or is it only possible with the charger?

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Should be the same voltage. The battery probably has a protective mechanism that can pass as well as nothing

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Not without a charger in between

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Simply with 5V on the LiIo battery with 3.7V rated voltage and 4.3V maximum? He will explode.