There is a battery disconnect switch above the gas pedal. It's in the manual.
Switching off the power supply
Battery main switch to the left of the center console
X Remove the key from the ignition lock and
wait for at least five minutes.
X Press button ; in the direction of the arrow
X Pull connector : from the ground pin.
X Push connector : as far to the side as possible
so that it cannot make contact with the
All starter battery consumers are disconnected
from the power supply.
As for the battery, there is nothing special about it and can replaced by anyone, even yourself.