Sorry to read of your problem Tom I have 2 sets of the batteries for my HB1B rig and they both are fine at this stage. I took them out from inside the rig I did not like them being that close to the circuit board.
I made up a lead to charge then externally from the radio still using the charger that came with the rig.
Not the answer to your problem of course.
cheers all Ian vk5cz …