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BQ20Z655-R1: Enabling IT before pack assembly

Part Number: BQ20Z655-R1

I have seen from previous threads that enabling IT before pack assembly is not recommended due to the potential for introducing errors into the Gas Gauge function.  It Was also mentioned that changing the Update Status from 06 to 02 (disabling IT) would not clear up the problem. However it was also stated in the same thread that most errors introduced would be worked out over the first few charge/discharge cycles.

My question is this: I have 130 newly manufactured packs that had the Update Status erroneously set to 06 in my .rom file when they were programmed/calibrated via MultiStation tester.  The packs have not yet been software sealed.  Can the issues with the wrong Update Status be resolved by issuing a System Reset (0041 command) before re-enabling IT (0021 command)?  This would be preferable to having to go back and manually re-program all 130 units (load default .senc file, load new .gg file, recalibrate V,T,I, and offsets, then reset and enable IT).

  • George
    We recommend keeping IT disabled until you are ready to seal the pack for a few reasons. The first is that the gauge does not record Lifetime Data until IT is enabled. It is better to calibrate the pack before enabling IT and a false DOD point may get set it IT is enabled. The DOD point error would be corrected with use, but the erroneous lifetime data may not get corrected. The reset would clear the false DOD point, but it may also cause lifetime data to be updated. You can check a couple of packs to see whether the lifetime data was updated to undesirable values.
    Tom