The engine code decides the capacity
Our verified BMW data shows how closely capacity tracks the engine: 80Ah for a 330i or M3, 80Ah across the 520i to 530i, 90Ah for the X5 xDrive30i and xDrive40i, and 105Ah for the X5 xDrive50i, M50i and the whole X7 range. Fitting the smaller figure to save money shortens life badly in UAE summers.




