Seemingly everything ok, but the Parkside 20V 2Ah battery is not charging

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Why is my Parkside 20V 2Ah battery not charging, and can it be repaired?

The battery is most likely faulty because its cell voltages are badly uneven and too low for the charger to recognize it, so the pack should probably be replaced [#19881143][#19881214] The flashing red/green LEDs on the charger indicate a battery fault rather than a normal charge state [#19881214] One suggested recovery attempt is to measure the individual cells under load and, if needed, precharge the weak cells separately with a 1S charger such as a TP4056 or a current-limited supply [#19881409][#19881438] Another suggestion was to briefly precharge the whole pack with about 20–22 V for around 15 minutes, then try the proper charger again [#19881143] However, several replies concluded that the cells are already too deeply discharged or worn out, so replacing all cells or buying a new battery is the most sensible solution [#19881599][#19883392]

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#31 19962097 03 Apr 2022 17:27

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19962097 03 Apr 2022 17:27

So now the question - what specific batteries should I buy to replace the old ones? Specifically not worse than the old ones, and maybe there will be better ones (or better ones, as some say)?
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Topic summary

The discussion revolves around a Parkside PAP20 A1 20V 2Ah battery that is not charging, indicated by flashing red and green LEDs on the charger. The user reports that the battery shows low voltage across its cells, with some cells significantly underperforming. Various contributors suggest that the battery is likely faulty due to uneven cell voltages and recommend replacing the battery or its individual cells. Some suggest attempting to charge the cells directly with a higher voltage to potentially revive them, while others caution against this due to the risks associated with lithium-ion batteries. The consensus leans towards replacing the entire battery for reliability, given the age and condition of the cells.
AI summary based on the discussion. May contain errors.