[tsekhar]

The i5 only allows you set one specific charge level. My previous Ioniq 5 allowed for different levels for AC and DC charging. that said, I don't see any significant downsides to charging to 100% on AC. DC is different, since the time to go from 80 to 100% can be pretty steep, especially since the BMW charging curve seems to be quite conservative.

[promee]

Originally Posted by AP

This is a bit of a long read but it describes what causes a battery to age and therefore how to prolong its use

https://batteryuniversity.com/articl...ased-batteries

This article is geared to phone and similar type batteries , car batteries are arguably more sophisticated but I believe the basics still apply

In summary the range to keep a battery is between 65 and 75% and away from heat

What’s bad is leaving a battery deleted or fully charged

I also believe that the car battery reserve some captivity at either end to avoid this so when it states it’s 100% charged that is really a bit less day 95

this is a brilliant article, but the key is really hidden.
in its figures, always doing 65%-75% cycles degrades the battery most less.
25%-100% is the worst.
but in reality, for 65-75%, you have to charge it 10 times comparing to 0%-100%, 5x comparing to 25%-75% cycles.
so power delivery(your true milage) has to be taking accouted.

i made a chart below by the data of the article.
25%-100% is the best. you lost 6.2% after 3000 times of your full capacity.
for i5, it's 3000*82KWh of milage.
but this happens only when you charge to 100% and return to 25% immediatelly.

SoD EoD DoD Cap left Cap loss power-deliverd Cap loss per 1000 delivered
100 25 75 81.5 18.5 3000 6.2
85 25 60 85 15 2400 6.3
75 25 50 87 13 2000 6.5
100 40 60 83.5 16.5 2400 6.9
100 50 50 85.5 14.5 2000 7.3
75 45 30 89.5 10.5 1200 8.8
75 65 10 93 7 400 17.5

rules of thumb of all experiment data:
1. reduce charging cycles. do deeper charge and recharge.
2. don't let battery sit at extremely low or high state too long.

one 20%-80% cycle looks better than two 40%-60% cycles.
85-25% better than 40%-100%
25-75% better than 50%-100%

hope it helps