Even accidentally disconnecting good cells in such a battery can cause a lock-out and effective loss of the battery from use. Whilst early versions were quite ‘dumb’ and could be persuaded to reconnect the battery to the outside world if the fault condition was corrected, later versions are more sophisticated and can permanently lock-out the battery terminals unless the BQ chip is ‘unsealed’ and ten the fault flag reset after new cells are fitted. This is a safety feature and not a bad idea as it prevents overheating cells ! Sadly the BQ chips have evolved over the years. What is common to all is the ‘battery lockout’ feature that basically disconnects the battery supply terminal if an imbalance or failure of a cell in the pack is detected. For those unaware, the TI BQ chips come in many types and with varying features. This post relates to replacing cells in laptop and tablet battery packs that are using the various Texas Instruments BQ series battery management chips. Dear All, I am more commonly found helping in the Thermal Imaging sub forum but I have come out into ‘General Population’ to ask for some help for a change.
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