Bosch Professional GLL 50 G Original Instructions Manual page 11

If the non-rechargeable batteries are empty, the laser lines will flash quickly for approx.
10 s, then the measuring tool will switch off.
Always replace all the batteries at the same time. Only use batteries from the same man-
ufacturer and which have the same capacity.
Take the batteries out of the measuring tool when you are not using it for a pro-
u
longed period of time. The batteries can corrode and self-discharge during pro-
longed storage in the measuring tool.
Operation with Lithium-Ion Battery Pack (Accessory)
Inserting/Replacing a Lithium-Ion Battery Pack
To switch from non-rechargeable batteries to a lithium-ion battery pack (6), remove the
battery compartment cover (9) and the inserted non-rechargeable batteries.
Insert the lithium-ion battery pack (6) and let the locking mechanism (7) click into place.
To remove the lithium-ion battery pack (6), press the locking mechanism (7) and take
the lithium-ion battery pack out of the measuring tool.
Charging a Lithium-Ion Battery Pack
For charging, use only a USB power supply unit whose output voltage and min-
u
imum output current comply with the requirements in the "Technical Data" sec-
tion. Observe the operating manual of the USB power supply unit.
Pay attention to the mains voltage. The voltage of the power source must match the
u
voltage specified on the rating plate of the power adaptor. Power adaptors marked
with 230 V can also be operated with 220 V.
Only use the USB connection to charge the battery at an ambient temperature of
u
between +10 °C and +35 °C. Charging outside of this temperature range can dam-
age the battery and increase the risk of fire.
Note: Lithium-ion rechargeable batteries are supplied partially charged according to in-
ternational transport regulations. To ensure full rechargeable battery capacity, fully
charge the rechargeable battery before using your tool for the first time.
If the lithium-ion battery pack is running low, the laser lines will flash slowly for approx.
1 min.
If the lithium-ion battery pack is empty, the laser lines will flash quickly for approx. 10 s,
then the measuring tool will switch off.
Open the flap for the USB Type-C® port (5). Connect the USB port to a USB power sup-
ply unit using the USB cable (15). Connect the USB power supply unit to the mains sup-
ply.
Bosch Power Tools
English | 11
1 609 92A 8K4 | (01.06.2023)