Battery firmware lockout: Difference between revisions

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==How it works==

When the battery is outside its operating range, such as ~~overcharged,~~ overcharged, overheated, unbalanced(in multi-celled battery packs), the BMS prevents the battery from further usage, limiting damage. However, the BMS should resume normal operation when the battery is back within operating range. Instead, the BMS changes bytes in its memory, leading to a "Permanent Fail (PF)" state, preventing the use of said battery even after reconditioning or repairing.

When the battery is outside its operating range, such as overcharged, overheated, unbalanced(in multi-celled battery packs), the BMS prevents the battery from further usage, limiting damage. However, the BMS should resume normal operation when the battery is back within operating range. Instead, the BMS changes bytes in its memory, leading to a "Permanent Fail (PF)" state, preventing the use of said battery even after reconditioning or repairing.

Documentations from known BMS manufacturers such as Texas Instruments said the device can permanently disable the use of the battery pack in case of a "severe failure"<ref>[https://www.ti.com/lit/ug/sluua43a/sluua43a.pdf? https://www.ti.com/lit/ug/sluua43a/sluua43a.pdf?] ([http://web.archive.org/web/20250604023257/https://www.ti.com/lit/ug/sluua43a/sluua43a.pdf Archived])</ref>. However, users report the battery is "bricked" after scenarios like long-term storage, discharging a laptop overnight or using a power tool in a warm environment while charging it cool, indicating the manufacturers have abused the BMS program, exaggerating the nature of the failure as a form of [[self-destructive design]].

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 ==How it works==
-When the battery is outside its operating range, such as overcharged, overcharged, overheated, unbalanced(in multi-celled battery packs), the BMS prevents the battery from further usage, limiting damage. However, the BMS should resume normal operation when the battery is back within operating range. Instead, the BMS changes bytes in its memory, leading to a "Permanent Fail (PF)" state, preventing the use of said battery even after reconditioning or repairing.
+When the battery is outside its operating range, such as overcharged, overheated, unbalanced(in multi-celled battery packs), the BMS prevents the battery from further usage, limiting damage. However, the BMS should resume normal operation when the battery is back within operating range. Instead, the BMS changes bytes in its memory, leading to a "Permanent Fail (PF)" state, preventing the use of said battery even after reconditioning or repairing.
 Documentations from known BMS manufacturers such as Texas Instruments said the device can permanently disable the use of the battery pack in case of a "severe failure"<ref>[https://www.ti.com/lit/ug/sluua43a/sluua43a.pdf? https://www.ti.com/lit/ug/sluua43a/sluua43a.pdf?] ([http://web.archive.org/web/20250604023257/https://www.ti.com/lit/ug/sluua43a/sluua43a.pdf Archived])</ref>. However, users report the battery is "bricked" after scenarios like long-term storage, discharging a laptop overnight or using a power tool in a warm environment while charging it cool, indicating the manufacturers have abused the BMS program, exaggerating the nature of the failure as a form of [[self-destructive design]].