while NIMH rechargeables are great for daily use, they loose to much energy over time, so might not be the best for longterm storage.
Modern NiMH like Eneloops have a lower self discharge and work well.
That being said no matter what battery I use you should pull it out and check and/or replace a couple times a year, end of winter, end of summer for example.
There are adapters that will hold 2-3 AA's in parallel in a C/D sized container, so you get one of those for each battery and fill them.
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