Best way to store rechargable batteries.

Black & Decker is doing it's obsolete tool game again, 18V tools are now a thing of the past. I have too many tools that run on that battery to just start over with their newest and best.

I have found a source of 18v batteries on Amazon that will fit their tools, they are advertised to be NI-MH batteries, much better than the B&D batteries at 1/4 of the price.

So, if I buy a supply of these batteries, what would be the way to get THE MOST LONGEVITY from them??? Some of my options could be leaving them as I got them, putting them on a charger unused until I need them maybe 4-5 years later, use them lightly in rotation with a lot of other batteries. Would storage in a cool place help???

While we might have some battery experts here, how is the best way to store NICADs and lead acid batteries???

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Best way to store rechargable batteries.