Sounds like you are talking about the high voltage battery pack not the 12v since the 12v doesn't have a gauge attached to it. From your description I think your HCH is performing a recal on the battery pack. Basically the pack is outputting less current than what the BCM and MCM are expecting so its performing a forced charge to recondition and reevaluate the batteries. How many miles do you have on your pack and do you use your IMA alot?
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