Restore a 40v Li battery that holds charge but won't recharge?

Price: $ 42.00

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I have a 40v, 2 AH, Type 4 Black and Decker lithium battery for a trimmer that is capable of holding a charge but when placed in a charger produces a flashing error signal. I have another of the same battery that charges ok, so the problem isn’t the charger. Also, the flaky battery will run

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Battery Fix - 40V won't Charge! Solved - Nailed it.

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Kobalt 40-Volt Lithium Ion (li-ion) Battery at

https://www.diyelectriccar.com/attachments/image_75e4fa5b-32da-4954-abc8-b4b97372b944_1024x1024-2x-png.130155/

Ryobi 40V BMS troubleshooting and repair, Page 9

https://qph.cf2.quoracdn.net/main-qimg-4b6f6cd1914c502bebbcefbf78c9841a

What is the time period to charge a Lithium-Ion 3.7v 4800mah rechargeable battery? How long will it work if it is fully charged? - Quora

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Why My Lithium Battery won't Charge?

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How do you fix a battery that doesn't hold a charge introduction and usage?

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40V MAX* 4Ah Battery

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Why My Lithium Battery won't Charge?

Have a Cordless Tool Battery Won't Recharge? You Can Fix That.