Refer to figure.
In the attached figure, the extremity of the graph indicates when the battery is almost fully discharged. You can observe a tendency for the voltage to drop on both types of batteries. The main difference is that the lead-acid battery’s voltage is decreasing linearly, whereas the NiCad battery’s voltage drop is rather abrupt. This is because the NiCad battery has a pretty steady voltage output throughout its entire discharging cycle (while in use).
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