Originally Posted by Sam12345
Bigger battery may make it work better?
I doubt it. I just don't see the point of a battery charging itself up and then discharging itself when the car is at a steady state constant speed.
First, all that does is add cycles to the battery - more wear, shorter life.
Second, energy conversion is always lossy. The energy stored by the battery is less than the kinetic energy available from using the burned gas for motion. Then taking that stored energy in the battery and then driving the wheels - more losses.
It's a complex system. I suspect this operation is required by some nuance of the design where gearing/speed push the ICE into a range that's not as efficient, so it alternates between operating the ICE at a higher power setting where it burns more efficiently and stores the excess energy with a periodic termination of the ICE to consume the excess stored energy. It really feels like they had to tweak it post-design because they didn't account for something.