I like using rechargeable NiMH batteries (AA and AAA) rather than buying single-use ones, for obvious reasons. The issue is, I often have to prematurely discard them because they leak. I suspect it has to do with storing them together in the same box, and with the weather (I live in a sub-tropical region where temperatures can get very high and there is a dry season and a wet season).
How should I store my rechargeable batteries in order to really use them to their full potential in the long term?