ETS-Lindgren HI-6153 Electric Field Probe - Manual (Page 86)

86 | Series H-491198-01 Battery Charger for NiMH Batteries
B ATTERY L IFE
The NiMH batteries powering the battery-operated probe have high energy
density for maximum operating time between charges, but also have a significant
self-discharge characteristic. When the probe is stored for longer than a week or
two, the batteries will discharge even though not in use. Leaving the batteries in
a discharged condition for long periods of time may result in reduced battery life.
For optimum testing time, charge the batteries before use.
The battery charger is microprocessor controlled to charge the batteries in the
fastest possible manner. When the charger senses that the batteries are fully
charged, the charging current drops to a maintenance level. This level is
sufficient to maintain the full charged without causing battery damage. It is
acceptable to leave the probe connected to the battery charger for extended
periods of time.
With proper care, the batteries should last two to three years. Follow these
recommendations to ensure maximum battery life and optimum testing
performance:
 Turn the probe off when the probe is not in use. Leaving the probe on
for extended periods of time will damage the batteries. When the
batteries are discharged, the flashing power
ON indicator will not
function.
 When possible, leave the robe connected to the battery charger, and
the battery charger connected to the mains electrical supply (charger
operating). The battery charger status indicators will show
CHARGER
ON and COMPLETE when the batteries are on a maintenance charge.
 Operate the robe only within the optimum operating temperature range
of +20
º C to +30 º C (+68 º F to +86 º F). Although NiMH batteries are
rated for operation in temperatures from -20 º C to +65 º C
(-4 º F to +140 º F), operating the probe at temperature extremes
reduces the operating time of the batteries.
 Make sure the batteries are fully charged before resuming operation.
The batteries do not require periodic deep discharges to reverse the
effect caused by repeated shallow discharges, but undercharging can
reduce battery capacity.