Ludi+ aka max battery kinda goes hand in hand with "launch mode" meaning:
Theres not many reasons to use ludi+ and if you do find the need to use it, you will also probobly want to "launch" it.
That being said, ludi+/launch have warning messages, indicating that it causes extra wear on your gear box etc.
But if you want the true thrill of what your car can do follow these steps:
Max battery mode, let it warm battery for 30+ mins.
Fully charge your car as much as possible (more battery % = more power)
Put your car into low or very low suspension (important)
Engage Launch mode! And enjoy the screams.
(Launch mode is engaged by having the car in ludi+ low/very suspension, at a full stop on a straight road: hold the brake pedal down, while holding brake down also hold down acceleration pedal, display shows "Launch mode enabled" release the brake and your off!
This is a different experience than just flooring the accelerator. Enjoy