Quote:
Originally Posted by Iron Lung Jimmy
He has a point.
I AM an engineer so I get the whole 80% thing but in my engineer's mind I'm thinking they should have made "full" (100% on the gauge) only 80 % of battery capacity. People fill up and owner and battery are happy.
They should also tell people that you can fill it up to 120% (100% of capacity) on occasion but you shouldn't do it too often as its not good for the battery. That way the nurse, and my wife, are not confused.
Telling even me, who understands it, that I should only fill up to 80% elicits a "Then why the f*%k don't you just call 80% 100%?" response. Telling my wife that you should only fill up to 80% elicits the question "Why?". When explained she asks the legitimate question "If it's bad for the battery why do they let you do it?"... which may be the best question of them all.
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I had to look up a better answer than what is easily repeated. I found it.
First of all it depends on battery type = chemistry. You are aware the Iron battery cars are suggested to go ahead and charge to 100% ?
The traditional battery I have is suggested to 80% unless driving it soon. It has to do with battery degradation if stored at a very high or very low state of charge. I found a chart but I don't know exactly what type of cells it references or if improvements have been made as Tesla keeps improving cells even mid year cycles. It does show how you don't want to leave your car highly charged in the desert heat or here in California it's been in the 100s for a few weeks. I consider all the available data and know many people won't follow the guidance and there is still only a few percent degradation in all batteries on average in a few years.
I liked to know what's going on so I can avoid wear similar to how you decide when to change your oil.