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to the charger simultaneously. In this situation, two
batteries are charged at the same time and the rest
are charged in the order that they were connected to
the charging station.
The following batteries can be
charged with the GKL221
charging station
Charging times
The charging time depends primarily on the maximum
charging current, the battery capacity and the charge
state of the batteries when connected. Charging time
of discharged batteries at +20 °C (+68 °F):
At ambient temperatures above +20 °C (+68 °F), the
battery charging time can increase by
up to 1 hour. (For the recommended charging
temperature range see the section on "Charging
temperature"). As the temperature of the battery
increases towards the end of charging, the efficiency
of the storage of the charge drops. Taking the
GEB121 as an example, in the first 90 minutes the
battery is charged to approximately 80% of
its full capacity but a further 60 minutes is required
for the remaining 20%.
The GKL221 charging station has a temperature-
control mode. This temperature-control mode is
activated as soon as the battery becomes warm. In
temperature-control mode, the charging current is
switched off until the temperature of the battery has
dropped back to a specific value. Charging is then
continued at a reduced charging current. The user
does not notice the charging current being switched
on and off in temperature-control mode because the
indicator remains green (charging). The temperature-
control mode is also activated if the ambient
temperature is too high.
Trickle charging
If fully charged batteries remain connected to the
charging station, trickle charging is performed
automatically.
This compensates for the self-discharge of the
batteries that occurs for technical reasons. The
batteries are always fully charged and ready for use.
The trickle-charging feature only activates for NiCd
and NiMH batteries, as Li-Ion batteries undergo a
very small self-discharge when not in use.
Refresh function
If the capacity of a NiCd or NiMH battery drops
noticeably, it should be "refreshed" 2 to 3 times.
When a battery is refreshed, it is completely
discharged and then subject to a quick charge.
Further information about the refresh function can
be found in the GKL221 user manual.
Battery adapter
The GKL221 charger is supplied with two battery
adapters. Using the charger in combination with the
battery adapters allows the following batteries to be
connected to the charger:
Professional 3000 charger
GKL211
The GKL211 is a simple, low-cost quick charger
(accelerated charging) for charging Li-Ion batteries.
Only Leica Geosystems Li-Ion batteries GEB90,
GEB211, GEB212 and GEB221 can be charged with
this charger.
Power supply
The GKL211 can be connected to the mains electricity
supply or to the battery circuit of a vehicle.