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What they mean is that NiMH batteries operate better and last longer if you charge them whenever you're done using them, don't try to discharge a NiMH battery.
NiCd on the other hand, the should be discharged before being recharged, best way is hook up a car lamp to it. Electrically, it is impossible to get a 'battery reversal' going on, as current can flow either way through a bulb just fine, if you don't believe me, then hook up a high-current rated diode to the correct terminal of the bulb and plug that in.
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