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Laser level Power Supply
The laser level can be operated either with
conventional non-rechargeable batteries or
with a Bosch lithium-ion battery.
Do not use any commercially available re-
chargeable batteries (e.g. nickel metal hy-
dride).
Operation with Bosch Rechargeable Lithium-
ion Battery Pack
Use only Bosch recharge-
able lithium-ion battery
packs listed in the technical data section of
this manual. Use of other battery packs may
increase the risk of fire, personal injury and
property damage.
Note: The battery pack is supplied partially
charged. To ensure full capacity of the battery
pack, completely charge the battery pack in
the battery charger before using for the first
time.
Use only Bosch chargers
listed in the technical
data section of this manual. Use of other
chargers may increase the risk of fire, person-
al injury and property damage.
The lithium-ion battery pack can be charged
at any time without reducing its service life.
Interrupting the charging procedure does not
damage the battery pack.
The "Electronic Cell Protection (ECP)" pro-
tects the lithium-ion battery pack against
deep discharging. When the battery pack is
discharged, the laser tool is switched off by a
protective circuit.
u Do not switch the laser level back on after
it has been switched off by the protective
circuit. This can damage the battery.
Battery charge indicator
If the rechargeable battery is removed from
the laser level, its state of charge may be indi-
cated by the green LEDs of the battery charge
indicator on the battery.
Press the button for the battery charge indica-
tor
or
to show the state of charge.
If no LED lights up after pressing the button
for the battery charge indicator, then the bat-
tery is defective and must be replaced.
GRL4000-90CHVG 10-21.indd 17
Assembly
Battery model ProCORE18V...
LEDs
5× continuous green light
4× continuous green light
3× continuous green light
2× continuous green light
1× continuous green light
1× flashing green light
Battery model GBA18V...
LEDs
3× continuous green light
2× continuous green light
1× continuous green light
1× flashing green light
Recommendations for Optimal Handling
of the Battery
Protect the battery against moisture and water.
Only store the battery within a temperature range
of −4 to 122 °F. Do not leave the battery in your
car in the summer, for example.
Occasionally clean the ventilation slots on the bat-
tery using a soft brush that is clean and dry.
A significantly reduced operating time after charg-
ing indicates that the battery has deteriorated and
must be replaced.
Follow the instructions on correct disposal.
Operation with Non-Rechargeable Batteries
It is recommended that you use alkaline manga-
nese batteries to operate the laser level.
Put the batteries into the battery adapter (23).
Make sure that the polarity is correct and corre-
sponds to the diagram on the battery adapter.
u The battery adapter is intended only for use
in designated Bosch laser levels and must
not be used with power tools.
Always replace all the batteries at the same time.
Only use batteries from the same manufacturer
and which have the same capacity.
u Take the batteries out of the laser level
when you are not using it for a prolonged
period of time. The batteries can corrode and
-17-
Capacity
80−100 %
60−80 %
40−60 %
20−40 %
5−20 %
0−5 %
Capacity
60−100 %
30−60 %
5−30 %
0−5 %
10/20/21 3:23 PM
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