One thing about the IMA Honda hybrid, the electric assist can be viewed as a powerful starter motor (10kva -> 14 hp). That starter motor is used normally to assist the 1 liter gas motor when needed and also to “instantly” start the engine when the gas engine is shut down while braking and the speed drops below 18mph. When the system is put back in gear the big NIMH battery pack and the 14hp starter spin the engine up astonishingly fast.
In cold weather, tomorrow Chicago forecast is for -9 F and Thursday morning -16 F is expected. That big battery and big starter motor work a lot better than the more standard starter/9v battery.