@Volusiano: Iām still not sure of the etiology of that failure:
- The batteries I originally had didnāt hold a charge nearly as well as my current replacements;
- Only one battery showed zero charge: the other had 2% left. Even that battery failed in the same way as the first within a day or two;
- The HA that said it was completely discharged fired up into a normal charge cycle as soon as I connected the charger to a power source (just like the 2% unit, and - even though that one never hit zero - it failed, too).
So, I wouldnāt want to frighten people by leading them to believe that one mistake will fry Oticon batteries.