Digital Equipment HiNote VP 700 Series, Справочное руководство по обслуживанию, Страница: 32 / 149

Overview
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General Battery Information
All batteries have limited life span. A battery’s life span is
measured by the number of charging and draining cycles it can
undergo before it can no longer be charged. The amount of time
that your system can be operated by battery power before the
battery is drained is referred to as battery
run time.
Nickel Metal Hydride Battery Care
Nickel-Metal Hydride (NiMH) batteries are extremely common in
many types of portable systems, such as cellular phones,
camcorders and portable computing devices.
Memory Effect
A NiMH battery in poor condition may begin to exhibit
characteristics of memory effect. Memory effect will occur when
a user does not allow the battery to fully drain before charging it
again. For example, if you use the battery for 20 minutes at a
time and then recharge it, the battery will tend to “remember” that
it only needs to operate 20 minutes per charge. As a result,
during the charging process, the battery will only receive a
portion of its charge capacity.
NiMH Battery Life
Memory effect has a direct impact on the battery’s life span.
NiMH batteries have a typical life of up to 800 (charge/drain)
cycles. If the battery is used an average of 30 minutes per cycle,
you can expect a total life of 400 hours. If you use the battery 3
hours per cycle, you can expect a total life of 2,400 hours.
Therefore, it is advantageous to use the battery as much as
possible during each cycle.