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What is the range in voltage of unloaded NiMH & Li-Ion cells from 100%-0% state of charge?

April 26, 2017cells charge li-ion NIMH range State unloaded voltage

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What is the range in voltage of unloaded NiMH & Li-Ion cells from 100%-0% state of charge?

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Most could tell you that the nominal voltage of Li-Ion and NiMH is 3.6(7)V and 1.2V respectfully, but that is only part of the difference. NiMH cells have an unloaded full charge voltage of about 1.35-1.40V and an end of discharge voltage around 1.00V. During 70% of the discharge, at rates less than 1C the voltage will be stable above 1.2V. Li-Ion on the other hand has a full charge voltage of 4.20V and a discharge termination voltage of 2.70V. The Li-Ion voltage will have more linear decreasing voltage from 4.2-3.0V.