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1.2V per cell: NiMH batteries have a standard nominal voltage of 1.2 volts per cell, which is lower than the 1.5V typically found in standard alkaline batteries. This voltage is consistent across common NiMH battery sizes, such as AA, AAA, C, and D cells.
1.4V to 1.6V per cell: When fully charged, a NiMH battery’s voltage will rise slightly above the nominal voltage, typically reaching between 1.4 and 1.6 volts per cell. This slight increase allows the battery to provide a bit more power at the start of its usage cycle.
1.0V per cell: During discharge, the voltage gradually drops, and once it reaches about 1.0 volts per cell, the battery is considered depleted. Below this point, continuing to discharge can damage the cell or reduce its lifespan.
In battery packs, NiMH cells are connected in series to achieve higher voltages:
4.8V (4 cells in series): Common for battery packs in RC cars or cordless phones.
7.2V (6 cells in series): Often found in power tools and some camera equipment.
9.6V (8 cells in series): Used in more demanding devices or higher voltage applications.
Load: NiMH battery voltage can vary slightly under different loads. High-drain devices can cause a drop in effective voltage output.
Temperature: NiMH batteries generally perform well across various temperatures, but extreme cold can reduce voltage, while high temperatures can impact battery life.
While NiMH batteries offer a reliable 1.2V, they may not be a direct replacement for 1.5V alkaline batteries in all devices, as some electronics are sensitive to the lower voltage. However, NiMH batteries excel in high-drain applications and provide stable performance throughout the discharge cycle.
NiMH batteries, with their 1.2V nominal voltage, are suitable for many applications, especially where consistent, rechargeable power is needed. They’re widely used in electronics, power tools, and even hybrid electric vehicles due to their reliable performance and environmental benefits.
