Spent some time with a number of Folks at Rayovac regarding their 312 batteries and packaging and branding as well as on the phone with a big box resellers customer service folks…
Some of what I learned…
all Rayovac hearing aid batteries are identical from Rayovac regardless of branding… Private label such as Kirkland, Proline, extra, retail store , battery club etc… ALL ARE IDENTICAL batteries IF FROM THE MANUFACTURER RAYOVAC/spectrum brands.
One of the big box stores that is discussed in these forums that had a 30 pack and now a 40 pack… both are by Rayovac… The 40 pack says 1.45 bolts although the 30 pack from at least one year ago also were 1.45 volts although they did not specify that higher voltage on the packaging.
the big box store has change from the EXTRA name on the batteries to a store brand name… but still same battery just a changed price… (LOWER per unit ~ HIGHER NUMBER PER PACKAGE)
Big box store spent over $30,000 dollars evaluating HA batteries before settling on Rayovac as their “store BRANDED” battery… they also compared performance to (among others) a German made battery which apparently would have been able to have been sold at a lower price as it was offered to the Reseller at a lower price.
Regardless of the higher cost for the Rayovac made batteries… they chose them after their own purportedly “totally independent” testing due to the results.
FYI it apparently cost Rayovac about $1 MILLION DOLLARS in research related expenses TO GAIN A 3% INCREASED battery life/reliability in their last round of product improvements.
I found this all very interesting… I am not an engineer. I am new to HA usage. I just hate having to change batteries as it is a constant reminder of my lack of self independence on a 5 day cycle.
I was curious and called the manufacturer and the big box reseller to find out if there was a manufacturing change with the removal of EXTRA and the addition of the in house branding and change in packaging quantity etc…
Interestingly I had been considering trying the German made/branded Batteries… as I only get 5 days with my Future branded aids using the stores supplied free batteries…
My telephone research has convinced me to not bother as I am about to become one of the regular consumers of purchased batteries.
If anyone has other facts that are not consistant with anything above… please post them… Thanks in advance… I am just trying to be a very informed consumer with a medical need.