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Ni-Cd batteries are monitored during charging to avoid damage resulting from..
  • A
    an excessive increase in temperature due to reduced internal resistance.
  • B
    an excessive increase in temperature due to evaporation of the electrolyte.
  • C
    increased pressure inside the battery due to a plugged battery-ventilation system.
  • D
    internal short circuits due to the accumulation of sediment.
In a NiCad battery, the plates are made of Nickel Oxide and Cadmium which are both suspended in an electrolyte solution of potassium hydroxide. They have a very low change in voltage during discharge as it remains relatively stable at around 1.2 V. One very important thing to consider about the NiCad battery is the charging. In fact, the heat generated in certain batteries is more than what the battery can normally dissipate, which leads to a rapid increase in temperature. This higher temperature leads to a lower internal resistance causing an increase in charging current, therefore multiplying the effect even more. If not monitored, the battery may be completely destroyed during charging.

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