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akkuman

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akkuman

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March 22nd, 2023 03:00

Battery pack BMS reset after cell replacement

Hello Folks,

I've replaced the cells in the battery pack of my Latitude E5540 with brand-new high-quality Samsung cells.

However, the self-health-check reportes that the battery is degraded and has to be replaced. The laptop does not even start without the charger plugged in. I know for a matter of fact, that these cells are in excellent condition and properly wired.

How can I reset the BMS to get this thing working again? The usual trick did not work.

Best

  • ejn63

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    31617 Posts

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    Posted March 22nd, 2023 04:00

    You'd need to replace the control board inside the battery.  Since there are safety issues as well, it is far safer to simply replace the battery pack.