Face it Ted, were just plain CHEAP...

Annnnnnnnnd.... I wanna try it....

I'm figuring on minimal destruction, just basically getting into and cutting the existing tabs from the dead batt, and attaching the wires from a new batt to those tabs once disconnected from the old batt...leaving it all potted in place, and then glue and heatshrink over the new batt external of the case, in the minimal recess I cut away.
If it works well, I will offer, for a price, to replace them.... anything that saves $300 and doesn't require a KDS and techs time and bill, is worth it...
I luckily had mine replaced under extended KPP, but was also lucky when I did, as they used the old style... so win win for me,