It is recommended that any rechargable batteries be run down before a recharge, this is supposed to give more charging life to the battery. So if this is the case then run the battery down before storing.
I use NiCads and NiMH AA batteries a lot. I always charge my batteries fully if they are for non use over a month or so. NiMH are reputed to be quite fast in self discharge. Therefore might get down to the critical voltage at which they are said to go into reverse polarity. I'm sure but someone will correct me if I am wrong. Try the two links below for the rundown on batteries.
There is no point in dicharging or charging before storaging NiMH as this type of battery loses it's charge normally. What is important is that they should be fully charged before use. NiMH also require several charges / discharges to attain their rated output.
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