Hilti C 7/24 Operating Instructions Manual Download

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6.3 Refresh mode

The individual cells of a battery are subject to self-dis-
charge. With older batteries, some of the cells may lose
their charge more quickly than others. As conventional
chargers switch off when the first cells have reached full
charge, the other partly-charged cells never receive the
full charge. The user becomes aware of this effect in the
form of inadequate battery capacity.
This effect can be eliminated by charging the battery in
refresh mode.

6.3.1 C 7/24



Start charging in refresh mode by pressing and holding
your finger on the "Refresh” button as the battery is
inserted into the charger. Release the button when the
yellow lamp lights (constantly). The yellow lamp lights
as long as charging in refresh mode is taking place.

The battery should be conditioned by charging in refresh
mode at regular intervals, after approx. every 30–50 stan-
dard charging cycles, but not more than once a month,
as frequent refreshing may weaken the battery. Condi-
tioning the battery by charging in refresh mode is, so to
speak, a kind of "training” for the battery. Just as exces-
sive training can be harmful to the human body, use of
refresh mode too frequently may also weaken the battery.

6.3.2 C 7/36-ACS

The function described above is controlled automatically
by the C 7/36-ACS charger. Charging in refresh mode
starts automatically, according to battery type, when nec-

essary. When a new battery is charged for the first time,
refresh mode is activated immediately in order to ensure
that the battery cells "form" correctly. If charging in refresh
mode is interrupted, the charger begins charging in
refresh mode when the next charging cycle is started.

-NOTE-

Regular charging in refresh mode ensures maximum
battery performance and long battery life.
The normal charging time may vary (increase) depend-
ing on the state of the battery.

6.4 Battery

A new battery must be charged in normal mode (with-
out refresh function) for at least 12–24 hours or charged
once in refresh mode before being used for the first time
in order to ensure that the cells can "form" optimally.
Never use a battery until it becomes fully discharged.
Recharge the battery as soon as its performance drops
noticeably. When a battery is drained until totally dis-
charged, the cells that become discharged first are dam-
aged by the current still being drawn from the other cells.

-NOTE-

At low temperatures,

battery performance drops. Bat-

teries should be stored at room temperature when not
in use.

At high temperatures,

batteries suffer damage. Nev-

er charge or store batteries where they are exposed
to the heat of the sun, e.g. at a window or behind a
motor vehicle windscreen, or on top of a radiator etc.

8. Care and maintenance

Unplug the supply cord from the mains socket.

8.1 Care of the appliance

CAUTION
Always keep the grip surfaces of the appliance free
from oil and grease. Do not use cleaning agents which
contain silicone.

The outer casing of the appliance is made from impact-
resistant plastic.
Never operate the appliance when the ventilation slots
are blocked. Clean the ventilation slots carefully using
a dry brush. Do not permit foreign objects to enter the
interior of the appliance. Clean the outside of the appli-
ance at regular intervals with a slightly damp cloth. Do
not use a spray, steam pressure cleaning equipment or
running water for cleaning. This may negatively affect
the electrical safety of the appliance.

8.2 Maintenance

Check all external parts of the appliance for damage at
regular intervals and check that all controls operate
faultlessly. Do not operate the appliance if parts are
damaged or when the controls do not function fault-
lessly. If necessary, your electric appliance should be
repaired at a Hilti repair center.

Repairs to the electrical section of the appliance may
be carried out only by trained electrical specialists.

8.3 Care of the battery

Keep the electrical contacts free from dust, oil and
grease. If necessary, use a clean cloth to clean the
contact surfaces.

In the event of battery capacity dropping below an
acceptable level after a long period of use, we rec-
ommend that the battery is returned to Hilti for a diag-
nostic check.

7. Accessories

CA 7/36 adaptor for BP 12, BP 40, BP 72 and RB 10

Printed: 07.07.2013 | Doc-Nr: PUB / 5069451 / 000 / 00