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It totally depends on the battery.
Nickel-cadmium batteries (used in those old Dynacharge rechargeable batteries) suffer from the "charge memory," so it's best to recharge them after they're completely drained of power.
However, it's recommended that rechargeable alkaline batteries (like the brand name Pure Energy. Actually, all alkaline batteries are rechargeable...) are never drained and kept as charged and as much as possible.
So, it really depends on what kind of battery you're using...
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