How many miles on your Mini SE?

Had it just over 3 months and have done 1,300 miles so about 400 miles per month.

Certainly haven’t noticed any degradation in this kind of timescale, got over 130 miles of range last week at 70mph in mild weather…

 

I'm at 31,500 miles. Had mine since August 2020, put about 85 miles per weekday on it. So I'm also putting the charge cycle of the batteries to a good test. No hint of degradation.

Update: I've had my SE for just shy of 19 months.

 

If you want a general comparative, you can see Chris Cathcart's report on his 2018 BMW 94Ah i3s for 134,055km (83,298 miles) in 39 months. He reports 4.23% battery degradation.

https://thedriven.io/2021/08/30/ev-grin-bmw-i3-owner-says-battery-still-great-after-134000km-and-minimal-fuel-cost/
https://www.facebook.com/groups/1737462746527033/permalink/2936865936586702/

 

19 months, 19,000 miles. No perceptible battery degradation.

 

I’ve had mine for just under 3 months and I’ve covered 750 miles. Obviously no degradation at this point.

 

It's a trade off between degradation and max range/acceleration with battery styles and chemistry. The 4.23% loss is the actual degradation, but it's probably buffered in the actual usable kWh so there will be little to no perceived range loss.

 

As of today, I have slightly more miles than I did yesterday.

 

But the i3 has Samsung batteries vs the newer CATL batteries in the SE.

 

1925 miles after 2 months.

 

Both the MINI and 94Ah i3/i3s are using the same NCM 333 chemistry to achieve close to 398.4V. Samsung SDI is 12 cells per module and CATL is 8 cells per module (16 for a double module). Both have 96 cells with the MINI at (2x8)+(5x16) and the i3 at 12x8. The closest dimensional comparative I can think of is VHS cassette vs Betamax for the cells.

 

But even if they use the same chemistry, aren't there other design variables like anode size? The quality of manufacturing beween companies might vary, too.

 

Yes anode size (i.e. copper sheet size) could play a factor. In the earlier 60Ah i3 batteries I believe they would stack the electrodes like sheets of paper (similar to pouch style) but the 94Ah switched to a tighter packed compressed roll of toilet paper.

The "A" sample testing was about 4,600 cycles to max 80% SOC retention for the Samsung SDI 94Ah so I would imagine the CATL ones should perform similar. If you want to play it safe just say 2,500 cycles, 28.9kWh usable and efficiency at 3.5mi/kWh. That would end up being 252,875 miles before you get to end of life at 80% of the original capacity.

 

I have yet to hear anyone cry about their Hyundai Palisade's fuel economy dropping from 19MPG in the city to 15.2MPG (20% drop in range) after 30,000 miles let alone any other ICE vehicle. Many parts of the world pay over $7.50USD/gal for petrol, so no big deal if it's over $4USD/gal.

 

Good point. My Prius that started out getting 50 MPG now gets 43 MPG if I'm lucky/careful at 78,000 miles.

 

It's unclear if the hybrid battery can offset the physical wear and tear on the ICE engine. Winters in the colder northern states have a bigger impact regardless. No data on the upper 1 state (Alaska) or middle 1 (Hawaii) but we have some data for the lower 48.

 

Sure. ICE vehicles with high miles don't make near the power that they do when they are new. It may not show up as a large decrease in fuel economy, but it certainly would when you're trying to pass, towing or any other activity that involves higher loads.

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