Use power supply to charge battery

Hi All,

I have a empty battery. I have no charger, how to charge it by a power supply ?

This is a 3.7V, 750mAh battery, I think it should be a Li battery. There are totally 3 contact point on battery.

Could you please advice ? THX!

Best regards, Boki.

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Hi boki,

You wrote "I think it is", when you are not sure do not take the risk, unless you like unintended phenomena. Because of 3.7V it will probably a Li-ion battery.

Google for Li-ion chemistry and charging. You may try to find the datasheet for some Li-ion batteries.

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has some nice technical documents on Li-ion chemistry.

For Li-ion and lead type batteries, charger is basically current limited (

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