but less often. Cycling lithium-based batteries is only recommended for the purpose of
measuring the performance. Many battery users have a
choice of switching from NiCd to NiMH to obtain longer runtimes
and/or reduce weight. Regulatory bodies advise using less toxic
alternatives because of the environment. But will the NiMH battery
perform as well as the NiCd in industries that require repetitive
deep discharges? The NiMH will not match the cycle count of the NiCd chemistry. This
lower life expectancy has serious consequences on applications that
need one or several recharges per day. However, in a recent study on
battery choice for heart defibrillators for emergency applications,
it was observed that a battery may cycle far less than anticipated.
Instead of the expected 200-cycle count after two years of use, less
than 60 cycles had been delivered. Such service information is now
available with the use of smart batteries. With fewer cycles needed, the switch to
lighter and higher energy-dense batteries becomes practical for these
applications. In most cases, NiMH can be used as a direct replacement for NiCd.
When doing so, the charger must be checked. A NiMH charger can charge
NiCd batteries, but a
charger designed only for the NiCd battery should not be used to
charge NiMH. Battery damage may result due to inaccurate full-charge
detection and excessive trickle charge while in ready mode. If no
alternative exists, the battery should be removed as soon as the
green ready light appears. Battery temperature during charge should also be
observed. Remote control racecar enthusiasts rely heavily on high current
capabilities and quick charging. NiMH batteries are now available that can handle very
high discharge currents. This makes the battery ideally suited for
competitions, because the weight and size of the battery can be
reduced. more info:www.good-
battery.com
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