Along the same topic, I noticed that the Starkey batteries seem to go full-power right up to the point of their death whereas, it seems the Duracell batteries I tried (were not only much more expensive but) seemed to fade out for the last hour or two before they died.
Yesterday, I had my Audi’ turn up both left and right hearing aids a bit, then I noticed afterward that the left side seemed to be quieter than the right side. Since my left side is a bit worse, the left aid seems to use up batteries just a tad sooner (perhaps a half hour or so compared to the right side).
This brings me to think that different batteries behave differently when they are about to die. The Starkey batteries I have been using from the beginning last full-power all the way up to the point of the aid beeping at me - notifying me that the battery is about to die. On the other hand, the Duracell seem to kind of fade for the last hour (or two) before they give the signal that they are about to die.
I just notified my Audi’ that I believe the aids are equally-balanced and that it was a battery in the left side that was going around the time she turned them both up a bit. As soon as I put in new batteries, the left and right are back to normal.
I pay a lot less for the Starkey brand 312 batteries than I did for the Duracell, and I get on average about 11-13 days out of the Starkey batteries vs. about 10-12 days for the Duracell (about two days on average LESS for Duracell). And, the Duracell were about 50% more in price than my Audi’ charges for a pack of six Starkey batteries!