How to Charge a 3.7 V Battery

Written by james stevens
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How to Charge a 3.7 V Battery
Use the correct charger to charge a 3.7 volt battery. (Polka Dot Images/Polka Dot/Getty Images)

A battery that has an output of 3.7 volts is a rechargeable lithium polymer (LiPo) battery. It can be used as a single 3.7 volt cell or wired in series as part of a battery pack. In many ways it is similar to a lithium ion (Li-Ion) battery, but is generally the preferred battery for use in remote control models, especially aeroplanes. Li-Ion batteries are mainly used to power cell phones and laptop computers.

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Things you need

  • LiPo battery charger

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  1. 1

    Insert your battery into your LiPo battery charger. You can only charge 3.7 lithium batteries using a specifically designed charger, otherwise you can damage your battery. More importantly, it could get overcharged and catch fire or even explode.

  2. 2

    Check the settings on your battery charger, if it has variable voltage settings. Ensure that your battery charger charges at a rate not higher than 4.2 volts, otherwise your 3.7 volt battery will get damaged.

  3. 3

    Turn on your battery charger, once you have confirmed the charge rate is correct. A red light usually illuminates to indicate that your battery is charging.

  4. 4

    Let your 3.7 volt battery charge. A LiPo charger has an automatic cut-off when it senses the battery is fully charged. When the battery is fully charged the charging light either turns green or turns off.

  5. 5

    Turn off the power to the charger. Remove the battery from the charger. Never leave chargers turned on or keep batteries in a charger.

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