How to Repair a Rechargeable Battery

Written by deb katula
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How to Repair a Rechargeable Battery
Save money on rechargeable batteries. (dead battery image by Vladimir Gurov from

No need to throw your used rechargeable batteries away. If your rechargeable battery no longer holds a charge, it can be repaired to work like new. Repairs on rechargeable batteries can work on cell phones, computers, appliances, cars, AA, AAA, D, A, C batteries and many others. The most commonly used rechargeable batteries include Nickel Cadmium (NiCd), Nickel Metal Hydride (NiMH) and Lithium Ion (Li Ion) batteries. Save money on new batteries by bringing your rechargeable batteries back to life.

Skill level:
Moderately Challenging

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Things you need

  • Dead rechargeable battery
  • Safety goggles
  • Multimeter or battery tester
  • 12-volt 5-amp AC/DC charger
  • Insulated gloves
  • Long sleeve shirt

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    Bring your rechargeable batteries back to life

  1. 1

    Confirm that your battery recharger is working. If your rechargeable battery charger is not operating properly, the repair should be to the charger and not the battery. To test the recharger, place a working uncharged rechargeable battery into the charging station. If this battery successfully charges, then the other dead battery should be repaired.

    How to Repair a Rechargeable Battery
    Repair rechargeable batteries. (battery image by Aditia Patria Warman from
  2. 2

    Test your rechargeable battery using a digital multimeter or battery tester to make sure it has no charge.

    How to Repair a Rechargeable Battery
    Test the battery charge. (battery tester on white image by JoLin from
  3. 3

    Test a fully charged rechargeable battery on the multimeter or battery charger. This reading will be used as a level to target for fully recharging a dead rechargeable battery.

    How to Repair a Rechargeable Battery
    Set a target full charge level (cylindrical batteries stacked image by from
  4. 4

    Put on safety gear including a long sleeved shirt, safety googles, and insulated gloves. This is a potentially dangerous procedure and all precautions should be taken to protect your skin and eyes.

    How to Repair a Rechargeable Battery
    Protect your eyes and skin. (safety at work image by Paula Gent from
  5. 5

    Locate the positive and negative ends on the rechargeable battery. On a AA battery, the positive end is the raised or bumpy end, the negative end is usually flat.

    How to Repair a Rechargeable Battery
    Positive end of battery. (battery image by KtD from
  6. 6

    Use the 12-amp, 5-volt AC/DC charger to revive your rechargeable battery. Place the black clamp on the negative end of the rechargeable battery. Quickly and lightly tap the red clamp onto the positive end of the rechargeable battery once or twice. The battery should spark.

    How to Repair a Rechargeable Battery
    Spark it. (grinding sparks image by Mateusz Papiernik from
  7. 7

    Hold the red and black clamps in place for a maximum of two seconds. The red clamp should only be on the positive end of the rechargeable battery; the black clamp should only be on the negative end. Release and check the charge on the battery. A fully charged AA rechargeable battery should read between 1.2 and 1.3 volts on a multimeter.

    How to Repair a Rechargeable Battery
    Finish the charge. (battery image by saied shahinkiya from
  8. 8

    Repeat the process in reviving your rechargeable battery until the desired charge is reached.

    How to Repair a Rechargeable Battery
    Revive rechargeable batteries. (battery on white image by Aleksandr Ugorenkov from

Tips and warnings

  • Try placing the rechargeable batteries in the freezer for 24 hours to see if that revives them before using the shock process.
  • This procedure can also be done with a welding gun.
  • This battery repair process should be done by individuals experienced in working with electricity. It is a very dangerous process.
  • During this process the battery could explode and spray battery acid. The battery could also catch fire.
  • This article is for information purposes only. Any damage or injury done to persons or property are the sole responsibility of any individual attempting this process.

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