I hate to be a party to this. If you are OCD you should consider an OEM battery from SONY. Those of you who have replaced your laptop battery with a generic model know what I mean.
IMO the generic batter is an improvement overall.
Not unpredictably the headphone is heaving difficulty sensing the level of charge.
If you are a power user should have the headphone on the charger at night
Otherwise the rapid charge ang long life btween charges should make this a minor annoyance