Battery Test - Husqvarna Automower 305 Technical Manual

6.6 Battery test

If the mower's battery starts to perform poorly,
the robotic lawnmower will mow for shorter time
periods. The mower can also stop and show the
message Low battery voltage. To establish whether
the battery is functioning unsatisfactorily a battery
test is recommended.
A battery test is also recommended in connection
with the mower's winter service. An inferior battery
can then be replaced before the next season starts.
6.6.1 Performing a battery test
1. Checking the battery's capacity requires
that the battery is completely discharged.
Use manual mode and fully charge the
battery. When charging commences the
battery temperature should not be more
than 40ºC.
2. Allow the robotic lawnmower to mow in
manual mode until the battery is completely
flat. The mower should have a low level of
cutting resistance during the battery test.
The cutting height should therefore be set
at maximum.
3. When the battery has run down the mower
stops. The result of the battery test is then
saved automatically and can be read in
Autocheck EXP or Battery capacity (5-
2-5) in the mower's display, see "Battery
capacity (5-2-5)" on page 24.
In cases where a battery test cannot be performed
on an installation, the test can be performed directly
on the work bench via Autocheck EXP. The test is
performed as above, except the mower's driving
wheel and blade disc rotate freely during the test.
Since resistance to the wheel drive and blade disc
is in principle non-existent, discharging the battery
may take several hours. Note that the most reliable
test results can be achieved when the mower is run
in one installation.
6.6.2 Evaluating the battery test
The four most recent battery tests are saved in the
mower. Read the test result from Autocheck EXP or
Battery capacity (5-2-5) in the mower.
A new battery has a total capacity of about
1,600 mAh but is charged to a maximum of
1,200 mAh. The test results from a battery test on a
new battery are thus normally around 1,200 mAh
As the battery ages the battery capacity decreases.
If the battery capacity displayed is approximately
900 mAh or lower, it is possible that the battery
6. TROUBLESHOOTING
is dead and needs to be replaced. Note that the
values are approximate and vary between different
mowers and assume that the measuring is done
as described.
NOTE! If the mower has not been in operation for
more than two months when the test is performed,
for example if the mower has been put in for
a winter service, at least two and preferably
three battery tests should be carried out. The
assessment should be based on the most recently
conducted test as the first test can show an
incorrect value. It is consequently more practical
to perform a battery test in connection with the
mower's normal operation or in connection with it
having recently been in operation.
When changing the battery Operating data, trip
should be reset in Autocheck EXP. This resets
the value for Chargings OK, which is a measure
of how old the battery is, both in the main counter
and the trip counter. A battery can normally take
approximately 2,000-3,000 charging cycles.
IMPORTANT INFORMATION
Note that the limit value 900 mAh is only
a guideline and that the battery capacity
can vary between different mowers. As
long as the mower can cut the grass the
battery does not need to be replaced.
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