Anyone keeping track of the battery's soh

I'm just about to reach 40,000 miles (39,740 mi to be exact, or just under 64,000 km) on my 2021 SE, which I've had for one month shy of two years. My daily commute is 80+ miles, so I've pretty much been charging every day from 40% SoC to 100% SoC. All I've been tracking is my trip range, but there's no sign of any battery degradation.

Here's the data from the day's drive from my most recent commute:

***********************************
Jul 8, 2022 at 18:13 ** 78.8°F ** Wind: 6.835 mph from E ** Humidity: 61% ** Driven: 87.7 Mi ** Start-Batt: 100% ** End-Batt: 43% ** Mi / kWh: 5.32 ** GOM Reading: 45 Mi ** Range Left: 66.11 Mi ** Total Range (From 100% charge): 153.81 Mi ** Total Range (From 100% charge): 153.748 Mi

 

Electrified app on '23 with 50 miles. 100% soh and 97.2 Ah capacity

 

Does the 68.9% number mean the SE's battery management software maintains a 31.1% top-end buffer?

 

No, I think it was just at 68.9% soc. Not sure why soc was listed at 68.6%

 

This is what I have seen so far. Seems to be dropping rather more quickly than I would have hoped. Anyone else tracking SOH?
date mi capacity(Ah ) SoH
6/27/2022 50 97.2 100
7/31/2022 445 96.4 99
8/27/2022 1010 95.8 98

 

Only three data points, but that aside, don't EV batteries show a small, more rapid drop at first, then a long gradual decay before a final nosedive? At least that's how I recall some long-term Tesla battery curves (not the same exact chemistry, of course).

 

This is generally true of Lithium batteries, yes. The specifics of that curve (eg when that final nosedive might occur) are what vary between chemistries.


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In 2000, I thought my gen-1 Honda Insight was so cool with its Nickel-Metal Hydride batteries (120 D-cells), consigning lead-acid batteries to the realm of ancient technology (ignoring the fact there was a 12-Volt lead-acid battery under the hood).

I'm waiting to read about the first mass-production, solid-state lithium battery and learn how long such a battery can retain close to its original capacity. Which will come first, practical fusion or affordable solid-state lithium batteries?

 

Practical fusion may be closer than you think. Or it could be never. But we are making strides in Plasma science which could be the key to unlocking grid-scale fusion. But Mr Fusion is definitely a long way off either way! And I bet we’d still have a lead battery in the car for some reason

We are due for a breakthrough in battery tech. It seems that solid state is constantly promised as “just around the corner”. But I will believe it when I see it. I hope it is soon, but in the meantime Lithium Ion is pretty good!


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AFAIK quick degradation like that is normal and expected. It’s part of how the battery protects itself. After that steep loss batteries tend to hold steady. Battery University has a lot of great info for anyone looking to dive deep into the topic.

 

And objectively, 41 000 km is more than 200 cycles and two full years, so a drop of 5% isn’t that unreasonable on a battery pack that is warrantied to stay above 80% SOH for eight years or 160 000 km. But I’d be surprised if it drops more than another 5% over the next six years, unless it’s being abused. I don’t think altitude change has much affect on battery degradation.

 

I am using electrified too.
I didn't record initial readings.
Last weekend I was down to 95.3Ah. A couple of 6+ hour float charges has me back up to 96.1 yesterday. I'm at 2672 miles
I read on a forum somewhere that i3s need to spend at least 5 hours at 100% with the charger hooked up to balance cells. I've been attempting to keep my charge between 30 and 85%. I was doing a weekly 100% charge for cell balancing. Will now be doing a weekly 6hr 100% float charge
When I saw the SOH at 97% after about 2500 miles, I was a little concerned. It's now 98%. Not as bad as Darrel's numbers...

I'll be keeping a close eye on it now.

 

Is the pack actually warranted to hold 80%?
I have only seen 'defects' etc covered.