BMW i4 GRAN COUPE Owner's Manual page 294

MOBILITY
Discharged high-voltage
battery and vehicle battery
General information
In addition to the high-voltage battery, the ve-
hicle has a 12 volt vehicle battery, which is re-
quired for operation of the onboard electronics.
With a discharged vehicle battery, no operation
of the vehicle is possible.
Service life of high-voltage
battery
General information
The performance of the high-voltage battery
decreases over its service life. The service life
of the high-voltage battery can be optimized
by how it is used.
Charging instructions
When charging multiple times in succession
using DC, e.g. during a longer trip, the charging
capacity is temporarily reduced as needed to
protect the high-voltage battery.
The charging capacity is also reduced as
the service life of the high-voltage battery in-
creases.
To optimize the service life of the high-voltage
battery, note the following:
▷ Preferably charge at AC charging stations
for daily use.
▷ Keep the charge level between 10 % to
80 % if possible, for instance by setting a
charging target of 80 %.
Charge target, refer to page 290.
▷ Recharge the high-voltage battery as close
to a planned departure as possible. A time
frame can be set for charging.
Charging in the time frame, refer to
page 289.
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Charging the vehicle
Online Edition for Part no. 01405A88AA4 - VI/23
Before and while driving
To optimize the service life of the high-voltage
battery, note the following:
▷ Bring the high-voltage battery to operating
temperature before driving. To do this, pre-
heat/precool the vehicle.
Setting the departure time, refer to
page 292.
▷ Anticipatory driving.
Increasing the range, refer to page 277.
Parking
To optimize the service life of the high-voltage
battery, note the following:
▷ Avoid direct sunlight at high outside tem-
peratures.
▷ Park the vehicle in a secure location at low
outside temperatures such as in a garage.
Long stationary periods
To optimize the service life of the high-voltage
battery, note the following:
▷ If possible, park the vehicle with a charge
level between 30 % and 50 %.
▷ Do not leave the charging cable connected.
▷ Do not park the vehicle for longer than
14 days if the electric range is exhausted.
Taking out of service
If the vehicle is parked for more than three
months, observe the following:
▷ Park the vehicle with a battery charge state
between 30 % and 50 %.
▷ Do not leave the charging cable connected.
▷ Check the battery charge at least once
within 6 months.
▷ Charge up to 50 % if the battery charge
state is below 10 %.
Maintenance
The high-voltage battery is maintenance-free.
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