How to repair my cordless drill battery

Written by jean asta
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A cordless drill's operation is dependent on its battery. If you've ever tried to run a cordless drill with a low battery, you know that the drill's performance suffers. If the cordless drill's battery is dead, you might think the only option is throwing the battery away. However, there is a chance that you can repair the battery.

Skill level:

Things you need

  • Protective eye wear
  • Protective gloves
  • Phillips or flathead screwdriver
  • Pencil and paper
  • Utility knife
  • Volt meter
  • Wire cutters
  • New battery cells
  • Paper tape
  • Soldering iron

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  1. 1

    Disassemble the battery case using a Phillips or flathead screwdriver. Take the battery cell bundle and any springs or other parts out of the plastic casing. Set everything aside but the battery bundle.

  2. 2

    Create a drawing of the battery bundle's connections. Carefully disassemble the battery bundle by cutting through the tape holding it together. Do not disconnect any of the cells from one another. Diagram which cells are connected to which other cells and how they are connected. Once you finish your repair, you will need the diagram to know how to reassemble the battery cells.

  3. 3

    Use the volt meter to test each battery. Place the red probe against the positive side of the battery cell and the black probe against the negative side of the battery cell. Identify which battery cell or cells are no longer holding a charge.

  4. 4

    Cut the connections between the bad battery cells and any connected battery cells using the wire cutters. Set the bad battery cells aside for disposal.

  5. 5

    Position the new battery cells in the correct places. Solder the connections on the battery cells to reconnect them to the neighbouring battery cells. The battery strap at the positive and negative end of the new battery cell should be soldered just as the previous battery cell was.

  6. 6

    Reassemble the battery pack, using the paper tape to hold the batteries in the correct arrangement. Reinsert the battery bundle into the battery compartment, replacing any additional springs or materials in their correct places. Screw the compartment back together.

  7. 7

    Fully charge the battery pack before using the drill again.

Tips and warnings

  • If you are not familiar with how to work with an electric soldering iron, do not attempt this repair.

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