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New battery life 312

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I realize this has been discussed somewhat previousty. I just purchased a quantity of 312 batteries from Amazon.
Rayovac Advanced 312
I have a battery tester and measured the batteries from the first package. They register 65% I have a few from a lesser known brand and the results are random, 65% to 100%.
THis is Rayovac, what gives? on the packaging the expiration date of the Rays is Aug 2028
I am using a Soundlink $7 tester from Amazon. What little info is obtainable on the internet the “best” is the Duracel tester. Same style and configuration. but $25. Wonder if I should get that and compare.
Comments please
If I am going to invest in hearing aid batteries I want the freshed

10 people in this conversation3 min readJump to latest

I think it is coin toss trying to get batteries that are 100% full.
But buying from a reputable source is the best approach.

I used to get Rayovac, Duracell and PowerOne, then it turned out PowerOne were better.
Try to get the latest PowerOne Evolution, they seem to be better.

I just realized maybe I should take the tab off and wait a few minutes to test.
I did so and got 100.%
I don’t think I will take this further, unless someone has some useful information

If you live near a Costco store, they have fresh batteries and at a good price. They also pay their staff relatively well.

@j45000 said:

I have a battery tester and measured the batteries from the first package. They register 65% I have a few from a lesser known brand and the results are random, 65% to 100%.

I’ve always been led to believe that ZincAir batteries don’t measure well, due to the way they work. Phonak don’t use a battery strength measure in the App for disposable batteries for this very reason. A Physicist friend of mine said that ZincAir batteries maintain a constant voltage throughout their life, right up until they die, unlike most other battery types, which gradually reduce their voltage as they degrade.

In the 30 years I’m wearing ’s I’ve never noticed significant fluctuations in battery life. They last about a week. Mostly using Rayovac 312, sometimes PowerOne 312. No difference between these brands. Also different brands of HA’s didn’t matter.

A couple of months ago Power One made by Varta had a bad batch of batteries. Some only last 30 minutes others would set off my low battery warning for a couple of days before the battery went dead. I complained to Varta gave them the lot number and they sent me replacement carton. Good customer service and the replacement batteries worked great but unfortunately came with the new child proof packaging. I found it is relatively easy to separate the cardboard package and remove the round plastic to remove the batteries and put them in a saved old style battery pack so it is easy to get them out.

In reply to @Baltazard

@Baltazard said:

I think it is coin toss trying to get batteries that are 100% full.

Interesting. Just got hearing aids for the first time and purchased some 312 batteries to replace the initial. The newly purchased ones don’t register 100% charge in the app the way the initial batteries did. Was wondering if I should look for certain makers (the originals were manufacturer branded).

But, I also notice that the maker is not always the same as the brand. The Renata batteries I bought seem to be made by Varta.

In reply to @j45000

No one has written this here, so I will. Be mindful that once exposed to air, the batteries starts to degrade and will be dead in a week or so, whether you’ve used them or not. So if you want to test them, only test ones you’re about to start using.

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