Just a technical correction: the HV traction battery on our cars and on most other hybrids is Nickel Metal Hydride and not lithium. NiMH cells are far more robust and cope far better with high current charging and discharging than any lithium batteries can manage.
But, yes, preventing them from fully charging or discharging is a deliberate feature to reduce battery stress fatigue and so ensures a long lifespan.
. (Reference to NiMH is at 2 minutes into the video)
Apologies for that. I knew it was one of them and I picked the wrong one.
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