Braun Trimmer Battery Replacement and Modification

Introducción

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.

Qué necesitas

Paso 1 Disassemble the trimmer

Braun Trimmer Battery Replacement and Modification, Disassemble the trimmer: paso 1, imagen 1 de 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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Paso 2 Print a holder for the batteries

Braun Trimmer Battery Replacement and Modification, Print a holder for the batteries: paso 2, imagen 1 de 3

Braun Trimmer Battery Replacement and Modification, Print a holder for the batteries: paso 2, imagen 2 de 3

Braun Trimmer Battery Replacement and Modification, Print a holder for the batteries: paso 2, imagen 3 de 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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Paso 3 Remove the old batteries

Braun Trimmer Battery Replacement and Modification, Remove the old batteries: paso 3, imagen 1 de 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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Paso 4 Attach the printed batteries holder

Braun Trimmer Battery Replacement and Modification, Attach the printed batteries holder: paso 4, imagen 1 de 2

Braun Trimmer Battery Replacement and Modification, Attach the printed batteries holder: paso 4, imagen 2 de 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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Paso 5 Place the new batteries

Braun Trimmer Battery Replacement and Modification, Place the new batteries: paso 5, imagen 1 de 3

Braun Trimmer Battery Replacement and Modification, Place the new batteries: paso 5, imagen 2 de 3

Braun Trimmer Battery Replacement and Modification, Place the new batteries: paso 5, imagen 3 de 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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Paso 6 Test

Braun Trimmer Battery Replacement and Modification, Test: paso 6, imagen 1 de 2

Braun Trimmer Battery Replacement and Modification, Test: paso 6, imagen 2 de 2

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

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Paso 7 Assemble

Braun Trimmer Battery Replacement and Modification, Assemble: paso 7, imagen 1 de 3

Braun Trimmer Battery Replacement and Modification, Assemble: paso 7, imagen 2 de 3

Braun Trimmer Battery Replacement and Modification, Assemble: paso 7, imagen 3 de 3

Now you should be ready to assemble the trimmer back

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Paso 8 Profit

Braun Trimmer Battery Replacement and Modification, Profit: paso 8, imagen 1 de 2

Braun Trimmer Battery Replacement and Modification, Profit: paso 8, imagen 2 de 2

Enjoy the proper working time of your refreshed trimmer

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Conclusión

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.

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