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How battery Charging at High and Low Temperatures (2)?

By: www.good-battery.co.uk

How battery Charging at High and Low Temperatures (2)?

How battery

Charging at High and Low Temperatures (2)?
   
The charge

acceptance of a NiCd at higher temperatures is drastically reduced. A battery that provides

a capacity of 100 percent if charged at moderate room temperature can only accept 70

percent if charged at 45°C (113°F), and 45 percent if charged at 60°C (140°F) (see

Figure 4-7). Similar conditions apply to the NiMH battery. This demonstrates the typically poor

summer performance of vehicular mounted chargers using nickel-based batteries.
Another reason for poor battery performance, especially if charged at high ambient

temperatures, is premature charge cutoff. This is common with chargers that use absolute temperature to terminate

the fast charge. These chargers read the SoC on battery temperature alone and are fooled

when the room temperature is high. The battery may not be fully charged, but a timely charge cut-off protects the

battery from damage due to excess heat.
The NiMH is less forgiving than the NiCd if charged under high and low temperatures. The NiMH cannot be fast charged

below 10°C (45°F), neither can it be slow charged below 0°C (32°F). Some industrial

chargers adjust the charge rate to prevailing temperatures. Price sensitivity on consumer

chargers does not permit

elaborate temperature control features.
more info:www.good-battery.co.uk

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if you have any questions,pls feel free to contact www.good-battery.co.uk

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