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Charging 101 for a first timer EV owner

3160 Views 8 Replies 8 Participants Last post by  BlueDH
Just joined the community today, and I have been reading up on some treads about charging, however, I have some additional questions:

1) Fast charging like with Electrify America is not good for battery life if constantly charging with DC as it degrades the batteries' life, but does it help slow this process down if you put the car into "Reduce AC current" from the infotainment system? I did this today at an EA station that support 150kwh and with this option set, at 42% SoC, the current speed was at 68kw.

2) Assuming that my car is 80% SoC at the start of my day and ending at 70% SoC, is it always good to charge back to 80% daily or let it dip to say about 40% SoC from a couple of days driving then charge it? Does choosing one over the other have any benefit to protecting the battery for it to last longer?

This is probably the biggest concern that I have as an EV owner as I have experience this with phone's batteries going bad after a couple of years. Just wanted to hear opinions from long-term EV drivers.

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First off, not having a full understanding of the many details of a fairly new technology does not make you dumb. Just keep learning. You can run your car at any level of charge down to zero and DC fast charging isn’t necessarily bad for it.

What is bad is heat and plating. If you are interested I can find a great video on lithium batteries but basically the lithium passes through between the cathode and anode to join the electrons that power the car. Less lithium means less available charge. You lose available lithium a couple ways but mostly from heat causing the lithium to plate the anode. If the battery has proper management, and part of that is cooling built in as well as only charging to 80%, it should not plate as much and therefore should not degrade faster than normal.

Unlike a cell phone battery an EV battery is many cells and the management system decides which cell to send a charge to instead of just charging everything at once. If it can distribute charge evenly without taxing one cell it can keep that charge safe. Over 80% there are less options to distribute so the likely hood of damage is greater. You can still charge to 100% but it is safer to do it at a lower charge rate and less often.
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