It almost sounds to me like the breakdown could have been caused by some windings short circuiting in the electric motor or you may have a short somewhere else that is draining the bat's even when the key is off, like a couple of shorted cells. After the short circuit the IMA could be using much too much power which could be why your bat's are always low and never recharge to normal levels. If possible, I would try and monitor the current during IMA usage. Not too many Honda dealerships have the brainpower needed to service these vehicles so you may to search for one that does..

Ralph.

BSEE..