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== Additional Information ===== Charging ===NiCad and NiMH batteries are amongst the hardest batteries to charge. Wheras with lithium ion and lead acid batteries you can control overcharge by just setting a maximum charge voltage, the nickel based batteries don't have a "float charge" voltage. So the charging is based on forcing current through the battery. The voltage do do this is not fixed in stone like it is for the other batteries. The minus delta V bump that is indicative of end-of-charge is much less pronounced in NiMH than NiCad and depends on temperature. New NiMH batteries can exhibit bumps in the curve early in the cycle, particularly when cold. Also, NiMH are sensitive to damage on overcharge.