That's pretty much how my HCHII works under normal conditions. However, I'm convinced that the battery packs of certain HCHIIs weren't balanced properly (supplier problems, lack of quailty controls, who knows). We also have more cells in our packs if I recall correctly, so there are more to get out of balance. When one or two cells start acting up, it looks like the whole pack is screwed up to the BCM so it goes into panic mode.

If Honda had spent a little extra $$ per pack, they could have built a smarter system that charges/discharges each cell appropriately. In that case, it could be possible to just change out the few cells with problems. However, (I'm guessing because of a bean counter somewhere) the whole pack rises and falls based on the lowest common denomonater cells, and the whole thing will need to be replaced when those cells finally go bad enough to throw an IMA light.