My 4/4 has a cheap topupable battery at the moment. This will be quite an improvement!
I read some time ago that BMW wanted to move to a 48V starting system, with a combined starter / alternator built into the flywheel. The idea was to reduce weight, and have a smaller battery.
By starting with all valves open, the engine could be brought up to starting speed quickly, then you start firing the cylinders one by one. With the valves open, you don't need such a hefty torque for the starter, and with 48V rather than 12, the size of the cabling can be greatly reduced.
Sounded rather sensible to me!
