Anybody tracking supercapacitors or ultracapacitors? A little off topic but whatever. Basically, people are trying to make hyrbid hybrid batteries. So take a smaller Li Ion battery and join it to some suped up capacitors and you can dump a load of electricity (for a nice boost to the ICE) or drastically increase the energy recovered from regen braking. So much so that you might be able to eliminate the drive wheels friction brakes.
Benefits in summary
1. Lighter battery pack
2. Deletion of friction brakes of at least two wheels
3. Explosive type acceleration boost from electric motors to ICE
I see this would benefit Honda's IMA system better than the Toyota's synergy drive.
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