Danger
Potentially Dangerous
Injury may result if this procedure is not followed properly. Use caution and follow all warnings.
Danger

Introduction

We are going to identify dead cells in battery packs and replace them.

Beware - This tuto is higly experimental, Li-Ion cell present fire / explosion / burn hazards this guide is for educationnal purpose only and should not be reproduced without safety measures. Remember to always wear apropriate PPE and work in appropiate environment.

  1. Battery pack works by putting individual cells in parallel / series. Each cell has a nominal voltage / capacity and they are put together to give the whole battery pack it's global voltage / capacity.
    • Battery pack works by putting individual cells in parallel / series. Each cell has a nominal voltage / capacity and they are put together to give the whole battery pack it's global voltage / capacity.

    • Here we have a 3s2p battery pack. This means that you have 3 serial attached blocks of 2 parallel cells.

    • The lefmost block seems dead, the cells reads a steady 0 volts on my multimeter.

    • The 2 other block show ~3.6 V which means they are still alive, great !

    • I haven't tested individual cells from the 2 working blocks for a good reason. This battery pack has been stored for several monthes, if only one cell in the block was dead, the other (good) one would have discharged in it until it also dies ( which is what must have happen in dead block )

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  3. Here I have 2 scrap 18650 cells form another dead battery pack. They are still charged but I have no fear has the battery electronics will balance the charge levels later.
    • Here I have 2 scrap 18650 cells form another dead battery pack. They are still charged but I have no fear has the battery electronics will balance the charge levels later.

    • After this step, reassemble the pack and everything should be fine.

    • Remember that this a dirty fix and you should consider the repaired battery pack as NOT SAFE

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Conclusion

Pour réassembler votre appareil, suivez les instructions dans l'ordre inverse.

15 other people completed this guide.

Damien Leflon

Member since: 12/27/2015

481 Reputation

1 Guide authored

One Comment

Salut, je pense changer toutes les cells dans ma batterie de laptop morte. J’ai actuellemt 6 x Samsung 26H. Est ce que je peux installer plus puissant ? Des LG HG2 18650 3.7v 3000mAh 20A High Drain Flat Top par exemple ? pour augmenter en duree et de vie de la batterie de mon laptop. Merci.

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