Comments on: Expensive 18V Festool Powerpack Saved From The Dump

By: Fredrik

Fredrik — Fri, 01 Aug 2025 11:43:57 +0000

Have the same battery. It had a short in a custom made toy and instantly dropped to 10V in a second without heat or smell or smoke. Took apart and all cells have full load. There seems to be a fuse at the negative terminal but it is difficult to see. Would be graet to just be able to replace the fuse.. Bluetooth and charger say all good.

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By: Victor Almendarez

Victor Almendarez — Sat, 13 Apr 2024 11:56:05 +0000

Great is wonderful

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By: Yogesh Panchal

Yogesh Panchal — Wed, 03 Apr 2024 06:52:42 +0000

Good JOB!Albert
you are right Albert these are risky job if you do not understand the requirement.

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By: Jestine Yong

Jestine Yong — Sun, 31 Mar 2024 09:07:34 +0000

In reply to Albert van Bemmelen.

Hi Albert,

No problem.

Jestine

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By: Albert van Bemmelen

Albert van Bemmelen — Sun, 31 Mar 2024 08:24:36 +0000

In reply to Jestine Yong.

Thanks for the fast correction by adding that last important photo Jestine!

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By: Jestine Yong

Jestine Yong — Sun, 31 Mar 2024 00:34:30 +0000

In reply to Albert van Bemmelen.

Hi Albert,

I'm sorry for that mistake. I have just included that photo of your nephew with a thumbs up.

Jestine

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By: Albert van Bemmelen

Albert van Bemmelen — Sat, 30 Mar 2024 16:16:15 +0000

In reply to Parasuraman S.

The last photo originally showed my nephew successfully testing the battery pack on his Festool charger with a thumbs up but somehow got accidentally removed from the article by Jestine?
Instead it now sadly shows a duplicate photo with Bluetooth App connection to a smartphone.

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By: Parasuraman S

Parasuraman S — Sat, 30 Mar 2024 14:03:42 +0000

Vow! Another excellent informative 'class' for me! Handling such battery cases is very tricky and sometimes very risky too. But you handled it like an expert surgeon. Many thanks for sharing, dear!

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By: Albert van Bemmelen

Albert van Bemmelen — Sat, 30 Mar 2024 11:56:14 +0000

These powerful li-ion cells are indeed something to be extra careful with! I do not think that I would risk repairing such large battery packs as you managed to fix Tayo.
And that is also the main reason why no one would want to risk parking a new electric Tesla or Chinese made car right next to his house. Once they start burning it will take at least a whole day to cool them down and stop the completely burning out battery cells. And riding any electric bicycle is almost as riding on a dangerous bomb if something goes wrong!

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By: Tayo

Tayo — Sat, 30 Mar 2024 10:09:08 +0000

Excellent article Albert!
I have resurrected a similar battery pack with nearly 21 of those 21700 cells (dual 20v and 60v capabilities).
I would solder the connectors which is never good for the battery (heat degrades the cell). Your spot welder recommendation will serve me well. Once you go down the rabbit hole of these batteries you will find that it is not as easy as simply replacing a dead cell but rather there are things like conditioning and matching the characteristics of the batteries. As these batteries and devices are becoming more common place it's good to start dipping your toe into this arena. Well done.

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