Constant power applications are very demanding on any type of battery chemistry. As the cell voltage decreases, the constant power requirement demands more current from the cells. Normally, this results in batteries that fail relatively quickly once the internal impedance (due to Cathode Freeze-Over) starts to increase.
Equipment requiring constant power should never be used with cells that are passivated. Because of the lower voltages typical of passivated cells, the constant power required by the equipment will often cause an excessive current drain, which results in cathode freeze over.
As long as the user in aware of the implications of using constant power, and as long as the used depassivates cells prior to use, constant power can be used successfully.
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