Topcon W106 Car Video System User Manual


 
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X20 Console Manual
Nickel-metal hydride has been replacing nickel-cadmium in markets
such as wireless communications and mobile computing. Experts agree
that nickel-metal hydride has greatly improved over the years, but
limitations remain. Most shortcomings are native to the nickel-based
technology and are shared with nickel-cadmium. It is widely accepted
that nickel-metal hydride is an interim step to lithium-based battery
technology.
Nickel-metal-hydride is less forgiving than the nickel-cadmium if
charged under high and low temperatures. Nickel-metal-hydride cannot
be fast charged below 10°C (45°F) neither can it be slow charged
below 0°C (32°F). The X20 charger is designed to adjust the charge
rate to existing temperatures. This is why this manual recommends that
the X20 is brought to room temperature before being charged after an
extended period of storage.
At higher temperatures, the charge acceptance of nickel-based batteries
is drastically reduced.
TIP
A battery that provides a capacity of 100% when
charged at moderate room temperature can only accept
70% if charged at 45°C (113°F), and 45% if charged at
60°C (140°F).
TIP