Cell Level Testing of the SK805A (Lightning Cell)

[02Reaper]

Unless these tests involve the vehicle they were designed in, being tested on the road, I wouldn't sweat it. You can make or break anything in a controlled environment.

Sponsored

 

[Zprime29]

Unless these tests involve the vehicle they were designed in, being tested on the road, I wouldn't sweat it. You can make or break anything in a controlled environment.

Knowledge of precisely what breaks them can be applied to their use within the vehicle to determine "best" practices for longevity. Hence his comment about small charge deltas and try to keep under 45C (easier said than done in the SW).

 

[Amps]

Did I miss any parts?

Maybe you missed taking the time to read his bio and posting history.

 

[wighty]

I will say that the delta is a HUGE issue for this cell

For those that asked, my interpretation of this is the delta he is talking about is the charging difference (ie cycling the battery from 10-90% is a larger delta than 40-70%).

 

[adoublee]

I will also say our testing takes us outside of what the truck allowed during our road testing. Do not expect me to make any more post about this specific cell, but I will entertain generic questions based on my 13 years of experience on testing a wide variety of cells

Are your comments generically about raw cells, or vehicle-specific packs with cooling and BMS?

 

[Tony Burgh]

Drive it. Enjoy it. Charge it when you want to. Nothing lasts forever.

 

[queuewho]

I charge to what I need. I don't worry about any of this. Until there are more shops out there that can do battery rebuilds and replacements, it isn't wise to keep any EV past its battery warranty.

Some day, I'm pretty confident, swapping out EV batteries in old project cars will be as common as engine swaps are today. We just aren't there yet. I'll be sticking to trading EVs in before half of their battery/powertrain warranty is gone.

 

[Refactoringdr]

Mickey's the expert and I will be the first to admit that the plural of anecdote is not "data", but I have 53k miles on a 23 platinum. Just ran FDRS battery diagnostic and the pack is still showing 100% health and a capacity of 396.4 Ah...whatever that means.

 

[potato]

For those that asked, my interpretation of this is the delta he is talking about is the charging difference (ie cycling the battery from 10-90% is a larger delta than 40-70%).

I was under the impression that "delta", when talking about battery packs, referred to the variation in state of charge between individual cells in a pack, particularly when under load.

But I agree this thread isn't particularly useful with the amount of information given.

 

[invertedspear]

Mickey's the expert and I will be the first to admit that the plural of anecdote is not "data", but I have 53k miles on a 23 platinum. Just ran FDRS battery diagnostic and the pack is still showing 100% health and a capacity of 396.4 Ah...whatever that means.

W = A x V, our battery is supposedly 400V, but maybe your car scanner gives a different number?
W = 396.4 x 400
W = 158,560
so 396.4 Ah should equate to 158.6 kWh, which is bigger than our battery is supposed to be....
I have read that our packs have 400V architecture but 370 "nominal volts" I don't know what that means. But it changes our calculation to 146.7 kWh which is still better than it's supposed to be, but much closer to being "in line" with the battery specs. Does your diagnostic show a voltage number?

 

[bydabeach]

Mickey's the expert and I will be the first to admit that the plural of anecdote is not "data", but I have 53k miles on a 23 platinum. Just ran FDRS battery diagnostic and the pack is still showing 100% health and a capacity of 396.4 Ah...whatever that means.

This is the only useful and understandable post in this thread full of 3 pages of questions and non-answers or vague answers.

 

[lightspeed]

Really perplexed about this post. The tldr seems to be

“I’m a battery expert and the battery Ford uses sucks and I’m selling my truck before the battery warranty expires. Please don’t ask me questions as I’m an expert and I can’t share any info”

Did I miss any parts?

Actually I think he said he was going to keep it for a while because 8 year warranty was good enough, but also that their tests exceeded the conditions that the truck's BMS would allow, so the batteries might last longer than his tests imply.

But it would be a lot better if he just said what he's allowed to say instead of forcing us to try to dig the information out of him.

 

[GoodSam]

I would think the Delta reference is about how much the swing in State of Charge (SOC) affects the battery chemistry due to the intensity of heat building during the reversing of the electron flow, especially during Fast Charging, and the longer this goes on, the more heating and breakdown of the battery cell chemistry (but hopefully the Battery Management cooling system is counteracting some of that). So charge in smaller increments (Delta=change of SOC). Besides, using DC Fast Charging, is fastest for the first, say, 50% going in (staying below 80%), so less time spent charging on the road. I would bet L2 (240Vac, home/work/hotel) charging at a 9kW rate, should be less stressful for the battery cells, so going to 100% as needed (and not staying there more than a day) is fine.

 

[Amps]

changes our calculation to 146.7 kWh which is still better than it's supposed to be

Your calculation is close to the battery sticker on the side of the 2022 packs.

The ER label reads: 143.4 kWh, the SR battery reads: 107.6 kWh

 

[Lytning]

I think Mickey is just trying to boost his forum Reaction Score with this thread. My reply will contribute one more to his tally.

Mickey, I do sincerely appreciate your history of sharing whatever information you feel comfortable sharing with us.

Sponsored