Braun Trimmer Battery Replacement and Modification

はじめに

In this guide, I describe how I replaced rechargeable batteries in my Braun Trimmer. The original batteries started losing their capacity after the first year of using the trimmer. So I decided to include a 3D-printed battery case in the trimmer to ease the process of battery replacement in the future. Plus, this approach doesn't require any soldering that could potentially harm the new batteries.

必要な工具と部品

手順1 Disassemble the trimmer

Braun Trimmer Battery Replacement and Modification, Disassemble the trimmer: 手順 1、 1の画像 1

First you need to disassemble the trimmer.
To access the four screws you would need first to open the frontal cover. Use opening picks, starting from the bottom of the trimmer
For detailed disassembly refer to another article on iFixit

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手順2 Print a holder for the batteries

Braun Trimmer Battery Replacement and Modification, Print a holder for the batteries: 手順 2、 3の画像 1

Braun Trimmer Battery Replacement and Modification, Print a holder for the batteries: 手順 2、 3の画像 2

Braun Trimmer Battery Replacement and Modification, Print a holder for the batteries: 手順 2、 3の画像 3

Print a holder for your new batteries on a 3D printer
I used a modified 3D model from ThingVerse
The original model is too big for the trimmer case. I modified the scale like following: X 97%, Y 84%; Z 95%
I stopped the printing at 60% of completion to keep the holder low enough to fit the trimmer case

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手順3 Remove the old batteries

Braun Trimmer Battery Replacement and Modification, Remove the old batteries: 手順 3、 1の画像 1

Remove the original dead batteries
I didn't have a soldering iron, so I used a heated knife to slowly detach the batteries from the connectors. It worked okay

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手順4 Attach the printed batteries holder

Braun Trimmer Battery Replacement and Modification, Attach the printed batteries holder: 手順 4、 2の画像 1

Braun Trimmer Battery Replacement and Modification, Attach the printed batteries holder: 手順 4、 2の画像 2

Place the 3D-printed battery case on the board so the connectors would go inside the case as you see on the pictures

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手順5 Place the new batteries

Braun Trimmer Battery Replacement and Modification, Place the new batteries: 手順 5、 3の画像 1

Braun Trimmer Battery Replacement and Modification, Place the new batteries: 手順 5、 3の画像 2

Braun Trimmer Battery Replacement and Modification, Place the new batteries: 手順 5、 3の画像 3

Place the new batteries into the case. Pay attention to polarities
Before full assembly, you can test if the new batteries are charging

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手順6 Test

Braun Trimmer Battery Replacement and Modification, Test: 手順 6、 2の画像 1

Braun Trimmer Battery Replacement and Modification, Test: 手順 6、 2の画像 2

After the battery has fully charged the trimmer should work as new

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手順7 Assemble

Braun Trimmer Battery Replacement and Modification, Assemble: 手順 7、 3の画像 1

Braun Trimmer Battery Replacement and Modification, Assemble: 手順 7、 3の画像 2

Braun Trimmer Battery Replacement and Modification, Assemble: 手順 7、 3の画像 3

Now you should be ready to assemble the trimmer back

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手順8 Profit

Braun Trimmer Battery Replacement and Modification, Profit: 手順 8、 2の画像 1

Braun Trimmer Battery Replacement and Modification, Profit: 手順 8、 2の画像 2

Enjoy the proper working time of your refreshed trimmer

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終わりに

My old batteries barely lasted one minute of shaving, and never held any charge. I didn't test the full working time of the new batteries, but they allowed me to use the trimmer at least for 10 minutes.

Thanks to adding the battery holder next battery replacement would be way easier and faster.

3 の人々がこのガイドを完成させました。