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How do I charge a lipo battery?

Charging a LiPo (lithium-polymer) battery requires care and attention. LiPo batteries deliver high performance, but are more sensitive than NiMH or NiCd batteries. Therefore, always use a suitable, computer-controlled LiPo charger.

Please note: The exact procedure may vary depending on the brand and model of the charger. Always consult the manual for both your charger and battery for the correct settings.

Needed to Complete

  • Computer-controlled LiPo charger (e.g. iMAX B6, SkyRC, Absima, ...)
  • LiPo battery with balance plug and main connector
  • LiPo-safe bag or heat-resistant surface
  • Power supply: mains adapter or 12V power source

Step-by-step charging

  1. Check the battery
    Never use a battery that is damaged, swollen, or punctured.
  2. Connect the battery correctly
    Connect the main connector (XT60, Deans, Traxxas, etc.) to the charger’s charging cable.
    Connect the balance plug to the balance board to charge all cells evenly.
  3. Set up the charger
    Select the LiPo program.
    Select the correct number of cells (e.g., 2S = 7.4 V, 3S = 11.1 V).
    Set the charging current to a maximum of 1C, unless the battery allows for a higher current.
    Example: 5,000 mAh battery → charging current 5.0 A.
  4. Start the charging process
    Enter the number of cells when prompted by the charger, then press start. The charger will begin charging and balancing the cells.
  5. Stay nearby
    Never leave the battery charging unattended. It’s best to place it in a LiPo-safe bag.
  6. Stop charging
    The charger stops automatically once the battery is fully charged. A fully charged cell has a voltage of 4.2 V. Check that all cells are charged evenly (difference max. ±0.01–0.02 V).

Important tips

  • Storage mode: use the storage mode (±3.8 V per cell) when not using the battery directly.
  • Never overcharge: don't go above 4.2 V per cell.
  • Do not discharge too deeply: keep the voltage above ±3.2 V per cell, use an ESC with LVC or an alarm.
  • Cooling and safety: charge on a non-flammable surface, preferably in a LiPo-safe bag.

Conclusion

Charging a LiPo battery with a computer-controlled charger is safe and efficient, provided you select the correct settings for the number of cells and charging current. Always connect both the main connector and the balance plug; preferably charge at 1C , and use storage mode if you won’t be using the battery for an extended period. This way, you can safely enjoy your LiPo batteries for a long time.