Why does the battery display on my device indicate plenty of battery power remaining just before it stops working?
This happens because of the different discharge characteristics between Alkaline and Nimh batteries. Because the voltage of an alkaline battery drops at a very predictable rate its possible to estimate the amount of capacity left in an alkaline battery based solely on its voltage. Many consumer electronic devices have a digitally displayed voltage meter to indicate the battery capacity remaining. It is important to note that these meters are displaying battery voltage as an estimate of capacity remaining. When compared with Alkaline Batteries, it is more difficult to determine how much energy remains in a Rechargeable Battery because of its constant operation voltage throughout. These displays will accurately display the voltage of your Nimh batteries but because of the flat discharge characteristics of Nimh batteries they will not accurately estimate the battery capacity remaining. Nimh batteries tend to show less than full capacity when fully charged (around 1.4V) and drop rapidly to
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