No. Under clause 6.3 of the rental agreement a car is never immobilised while occupied or moving, and never for a low battery. Immobilisation is limited to non-return after 48 hours written notice, theft, and dangerous operation. You may obtain two emergency releases of 24 hours in any rental month.
Question
Can the car be immobilised while I am driving?
Never. Not while occupied, not while moving, and never for a low battery.