My audiologist had numerous complaints about Rayovac batteries that he sold a while ago and switched back to Power One. I myself find no difference between them since I get 8 days of power in my HA's with both brands. One caveat is that when I use accessories such as the Compilot, it tends to cut the time by a few hours.
Similar waveform for both ears
Presently wearing Phonak Ambra SP hearing aids.
I am also using the included Phonak ComPilot/TVLink package.