Martel Electronics BetaGauge 3II - Manual (Page 169)

Battery Care/Maintenance A-4
Battery Packs
The BetaGauge II uses rechargeable nickel–cadmium
(NiCd) batteries that have high power-to-size-and-
weight ratios. If properly maintained and cared for, they
will provide years of excellent service. However, NiCd
batteries are susceptible to damage under the following
conditions:
 Heat. Protect the batteries from prolonged
exposure to extremely hot temperatures.
 Cold. Protect the batteries from prolonged
exposure to extremely cold temperatures. If
possible, when batteries are cold, allow them to
warm to room temperature before using them.
 Charging. Charge batteries at an ambient
temperature of 0 to 45ºC.
 Overcharging. Overcharging NiCd batteries is the
most common cause of early failure. Do not charge
the battery packs continuously. For a full charge,
the trickle charger requires about 12 hours . (Never
charge the batteries for more than 16 hours.)
Approximately once a month, allow the batteries to
fully discharge before recharging.
 Storage. Store battery packs at an ambient
temperature of 0 to 35ºC. If you must store a
battery packs for a prolonged period (more than
three months), you should discharge the battery
pack prior to storage. The recommended method
for discharging a battery pack is through use in a
BetaGauge II calibrator.