For secure, waterproof, low-bulk packaging of strictly-for-backup batteries, would it work to use plastic dip? Or would its temporarily-liquid nature harm the batteries before it dried?

The idea came when I was replacing the battery pack in one of my cordless phones this weekend. Those come bundled in some sort of plasticized shrink wrap.

Dan
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"Things that have never happened before happen all the time." — Scott Sagan, The Limits of Safety