User's Manual

6. Before use
NOTE
The PR 90 may only be operated using the Hilti
PRA 84 battery.
6.1 Charging the battery
DANGER
Only use only the Hilti batteries, car battery con-
nectors and Hilti mains adapters provided, which
are listed under “Accessories”.
NOTE
Make sure the system to be charged is standing
securely during charging.
6.1.1 Charging a new battery for the first time
Charge the battery fully before using it for the first
time.
6.1.2 Charging a previously used battery
Ensure that the outer surfaces of the battery are
clean and dry before inserting it in the corresponding
charger.
Lithium-ionbattery packs are ready to use at any time,
even when only partially charged. Charging progress
is indicated by the LEDs.
6.2 Options for charging the battery
DANGER
The PRA 85 mains adapter is for indoor use only.
Avoid ingress of moisture.
6.2.1 Charging the battery when it is still in the
appliance 9
NOTE
Take care to ensure that the temperatures during
charging correspond to the recommended range (0
to 40°C).
1. Place the battery into the battery compartment.
2. Turn the catch so that the charging socket on the
battery can be seen.
3. Plug the connection of the mains adapter or the
car battery connection into the battery.
4. During charging, the charge status is indicated
by the battery indicators on the appliance (the
appliance must be switched on).
6.2.2 Charging the battery outside the
appliance 9
NOTE
Take care to ensure that the temperature during
charging corresponds to the recommended range (0
to 40°C).
1. Remove the battery from the appliance and plug
in the connector of the mains adapter or the car
battery connector.
2. The red LED on the battery lights up while char-
ging is in progress.
6.2.3 Charging the battery while the appliance is
in operation 9
CAUTION
Avoid ingress of moisture. Moisture may cause a
short circuit resulting in a risk of burning injury or
fire.
1. Turn the cover so that the charging socket on
the battery can be seen.
2. Plug the connection of the mains adapter into
the battery.
3. The appliance continues to operate while char-
ging is in progress.
en
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