Ferrari 458 Italia, Technical Documentation Manual

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A3.24 Checking and recharging battery
Checking battery charge level
If you are in doubt about your battery or it if shows signs of inefficiency, check its charge level.
Disconnect the battery ( F2.01 ).
For the purposes of such a check, the battery must be at room temperature (between 15 and 25 °C ) and must
have been resting for at least 6 hours, i.e. it must not have been connected to any devices, even if these
absorb only a few milliamperes.
Then proceed as follows:
Remove the battery ( F2.01 ).
Remove the passenger footrest.
Detach the positive terminal (A) from the battery.
Connect the terminals of an appropriately calibrated
digital multimeter (Beckman T11 OB) (M) to the
battery poles.
Read the voltage value displayed by the multimeter to two decimal points. If the battery is insufficiently
charged, with a voltage of less than 12.55, either recharge or replace, depending on the voltage measured.
Once the battery has been recharged, make sure it maintains the same charge over time by carrying out a
test under full-load conditions.
To carry out the test, use a battery tester with a current range of 200 to 300 amperes .
Test the battery in the following way:
connect the battery tester to the battery terminals;
measure the battery temperature;
set the battery tester to a discharge current equal to
75% of the value indicated on the battery identification
plate (DC);
apply load for 15 second s and measure the voltage while still under load;
compare the voltage measured (with open circuit) against the limits given in the following table.
Page 1 of 9 Checking and recharging battery
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