Batteries dying in Phonak case

I switched to Duracell Activair 312 Batts. I keep a back up set in the metal Phonac case ,sometimes for a couple of weeks. At least 2 sets were DOA when I went to use them. ??Ideas on this?

If they are touching, they’ll discharge even with the stickers on them.

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Correct. The stickers do not cover the entire case, only the area with the air vents. You need to keep them in a non-conductive case.