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IIRC no high voltage car batteries are actually charged/discharged 0-100%, even if it reads so from the user's perspective. This is due to significantly increas
by ProfessorLayton 9y ago
IIRC no high voltage car batteries are actually charged/discharged 0-100%, even if it reads so from the user's perspective. This is due to significantly increased wear on the batteries when fully charged/discharged, and why a cellphone battery only lasts a few years.
The batteries need to be significantly over-provisioned to extend their lifespan. A Prius, for example, will keep the battery's SOC between 40-80%, and is one of the most reliable hybrids out there.
The same is true for EVs, so charging it till it reads 100% does not mean the battery is at capacity. The same is true when it reads empty.
- mikeash 9y agoI don't think any lithium ion battery is ever truly used at 0-100%. True 100% would be just before it explodes, and true 0% would be just before it completely bricks. You get horrible degradation near those areas so they're always avoided. I'm sure consumer electronics push it farther than cars do, though.
- hwillis 9y agoThe "sticker" capacity on a Tesla is usually ~3% lower than the real capacity (the one in EPA filings), but the car lets you chose any charge level up to the sticker rating. That's the one I'm talking about- I just mean as relevant to an owner.