Anyone keeping track of the battery's soh

The 80% rule predates Tesla. Early in the development of Lithium cells, it was found that staying away from the extremes of charge increased their cycle life. There has been considerable refinement since which reduces the damage from going to 0 or 100, but the effect is still there. Your battery will push your car further if you keep it between 30% and 80%.
Tool batteries are generally only charged to 4V/cell to increase life.
Saying that, anecdotal evidence is that the Mini battery holds up very well, however you charge it.
I have noticed there seems to be a delay in balancing, but I haven't dug into this.
My SOH has been floating around in the lower 90s. I'm at 45k miles. I've not been very religious about 30-80, though I do aim at that range if I won't need all the range. With the Mini's buffer, a displayed 20-80 should equate to 30-80 and maximise the miles you get from a battery. I'm planning to keep my SE until it dies, so I try not to abuse it too badly. Hopefully, by the time the battery has lost significant capacity, there will be a higher capacity retrofit option, as there now is for the i3. If I could find out exact cell dimensions, this could be investigated. An extra 10kWh would make the car perfect for me. SE cells start life at 97.2Ah. It is often confused with the 93Ah i3 battery. The i3 cells are made by a different company in a different country...
 
M.Tray said:
22650 km, and battery capacity is 99.76 Ah. (Battery temperaure at 15.62 C). I always charge to 100% (L1 - 16A, 220V), and leave the car to balance the cells. I'm not sure, but somebody told me that the balancing starts after 4 hours of idle. By charging to less than 100, you are stressing the weaker cells and therefore minimizing the overall battery capacity. Just plug it after arrival and leave it on the charger.
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The acronym frequently used on this forum is "ABC" for Always Be Charging.

If MINI really wanted 2022 and later SEs to be charged to 80%, they would have included a software option to make that happen.
 
TO the best of my knowledge, there is no evidence that charging to 100 percent lowers battery life in a managed battery pack. All the 'research' involves charging Lithium cells on a bench in a lab over and over.
I don't have a mini, but my Kia I charge to 100 percent the once a week or so I charge it. If it is plugged in every day I tend to limit it to 80 or 90 as it is best to not have the battery 'sit' at 100 percent all the time.
Vehicles with small packs like the mini are designed to be charged all the time. It would make no sense to do otherwise.
 
SameGuy said:
...he says as he slaps on the autocross wheel set and dials in the suspension tweaks ahead of another weekend of rollicking good fun...
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I wasn't talking about the tyres...
Car has been been almost faultless for autocross. I have had a 'temporary' sway bar bracket break. My front jacking points have lost about 2/3 of their height. Even the EBC pads are holding up really well. I often turn the front discs blue.
 
Back to original topic:
Currently 45,500 miles 94% SOH. I've seen it vary a little in the lower 90s probably depends on when it was last float charged. I sometimes leave it plugged in overnight. Normally, I try not to let it sit at 100%
 
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