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Repairing a Cordless Drill Battery

  1. Repairing a Cordless Drill Battery, Repairing a Cordless Drill Battery: step 1, image 1 of 3 Repairing a Cordless Drill Battery, Repairing a Cordless Drill Battery: step 1, image 2 of 3 Repairing a Cordless Drill Battery, Repairing a Cordless Drill Battery: step 1, image 3 of 3
    • This battery operation concerns 12Volt, 14.4V and 16,8V cordless drills. First open the pack. Take out the battery cells. and disconnect the connector on the top.

  2. Repairing a Cordless Drill Battery: step 2, image 1 of 3 Repairing a Cordless Drill Battery: step 2, image 2 of 3 Repairing a Cordless Drill Battery: step 2, image 3 of 3
    • Next step is to take a 15cm long speaker cable. To one side you press 2 slide connectors. The other side you solder the top connector of the old battery pack. take care with the polarity. You can see the plus and the minus on top.

  3. Repairing a Cordless Drill Battery: step 3, image 1 of 3 Repairing a Cordless Drill Battery: step 3, image 2 of 3 Repairing a Cordless Drill Battery: step 3, image 3 of 3
    • When the cable is done we can push the top connector back. To hold this in place we have to make a spacer from wood.

  4. Repairing a Cordless Drill Battery: step 4, image 1 of 3 Repairing a Cordless Drill Battery: step 4, image 2 of 3 Repairing a Cordless Drill Battery: step 4, image 3 of 3
    • Now we have to find a way to connect the battery to the old box. The best condition is when the battery fits exact in the old battery box and that this can be closed. When not there is a possibility to use tie wraps to hold all in place. An other way is to saw the box open. On the last photo's you see how a Black and Decker is hacked.

    • So, this is it. There is also a video on YouTube about this hack. Here you find the instruction video

  5. Repairing a Cordless Drill Battery: step 5, image 1 of 2 Repairing a Cordless Drill Battery: step 5, image 2 of 2
    • Last but not least the question; how to charge the lead gel battery? For a 12Volt drill you can use the usual charger. For drills with a higher voltage you have to use an adaptor with a 12V till 14 V unstabilized DC output. Its easy to connect the adaptor cable to the charger because there is no electronics build in.

    • Addition: To avoid wasting the old adaptor, you can use a charger IC. It is the PB137. You need only 2 capacitors extra. See the diagram. The input voltage can be between 16 and 40 Volt DC. This circuit fit's easy within the charger unit.

Conclusion

To reassemble your device, follow these instructions in reverse order.

3 other people completed this guide.

Berto A

Member since: 06/12/13

300 Reputation

1 Guide authored

2 Comments

Thank you for the good article. I tried to make my own comparison table of the cordless drills and got the following results: https://www.firstcordlessdrillreviews.co... , it is a usefull guide for people who decided to buy a drill and who don’t know nothing about them.

Albertosi - Reply

It is so helpfull of the article.  We can buy some battery cells, and replace its by ourself when the drill battery is died.

Drillbatterycomau - Reply

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