we’ll then, seems we need to enable auto update software
we pull CAC through a separate interface, so this is a welcome improvement to SMT
btw: nice balance! the CAC on that is well within 99 percentile.
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What Constitutes Battery Replacement Under Warranty for Older Batteries?
- Thread starter Tam
- Start date
we’ll then, seems we need to enable auto update software
we pull CAC through a separate interface, so this is a welcome improvement to SMT
btw: nice balance! the CAC on that is well within 99 percentile.
In not looking for a replacement @ this time, just would like T support to acknowledge my battery is degrading too quick & they will address it when it degrades > 30%. If they cant acknowledge my battery issue now, they prob wont acknowledge a battery issue >30%.
ucmndd
Well-Known Member
islandbayy
Active Member
Is there a specific way to see the CAC values? I have the most updated version of SMT and cannot find the CAC numbers anywhere???
islandbayy
Active Member
Was checking the differences between iOS and Android and for me it looks iOS is more reliable (battery capacity in special). And it took less than 2 minutes to get the CAC values
@Recell if interested
@Recell if interested
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awesome
<installs iOS version>
small nit - min/max/avg CAC can be reported to one decimal place.
big nit - full CAC by brick would help a LOT of people understand battery health. better than voltage by brick would. that said, the Min-to-Avg CAC delta is a VERY decent proxy of pack health. if it’s much more than 3 you start getting into a grey area, even more so if the Avg-to-Max CAC delta is around 1… that’s why displaying min/max/average to own decimal place comes in handy.
<installs iOS version>
small nit - min/max/avg CAC can be reported to one decimal place.
big nit - full CAC by brick would help a LOT of people understand battery health. better than voltage by brick would. that said, the Min-to-Avg CAC delta is a VERY decent proxy of pack health. if it’s much more than 3 you start getting into a grey area, even more so if the Avg-to-Max CAC delta is around 1… that’s why displaying min/max/average to own decimal place comes in handy.
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Totally wish it had brick-level CAC reporting.
Interesting you use min-to-avg delta % instead of min-to-max. Useful to know; I was wondering if there was a slightly more official of the two calculations to use for imbalance %. SMT is clearly reporting max-min as the CAC imbalance total.
Good news, you can see the values to tenth of an Ah on the “dashboards” if you scroll all the way down to the last pane. Here’s mine right near its demise:
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Additional note from all this: the brick ID is almost always wrong or even flat out backwards. In the pic above it says my max CAC brick is 45, when brick 45 is/was the problem child all along. First brick to reach max voltage and first to bottom out at low SoC, demonstrating it’s severely reduced capacity. You have to find the bad brick(s) by manually monitoring individual brick voltages across various SoCs in SMT. Shout out @wk057 for turning me on to that fact somewhere in one of these threads.
min-to-max is of course useful, but the min-to-avg and avg-to-max gives you a quick sense of what the distribution looks like. if the deltas are the same (and both relatively small), then the distribution is generally evenly spread and the pack is likely doing fine. if it's skewed, especially when the min-to-avg is greater, then you have one (or more) modules that have likely failed (or is failing) while the remainder are working perfectly fine. because we only see failed/failing packs (after all, we live in a world of failure 
) we see this min-to-avg skew A LOT.
(and if the spread is equal, but relatively large - say greater than 6 Ah min-to-max with min-to-avg ang avg-to-max the same - you actually have a pack that has multiple bricks, possibly multiple modules, that have failed, or are failing. that's actually our worse case scenario, and may prevent us from being able to re-certify a pack...
)
) we see this min-to-avg skew A LOT.(and if the spread is equal, but relatively large - say greater than 6 Ah min-to-max with min-to-avg ang avg-to-max the same - you actually have a pack that has multiple bricks, possibly multiple modules, that have failed, or are failing. that's actually our worse case scenario, and may prevent us from being able to re-certify a pack...
)
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Do you have the formula for calculating those CAC values if they are not given in SMT? I have an older car and am watching it closely since my warranty is up soon.
Can’t be calculated from other values in SMT. Sounds like only the iOS version gives them out. Not sure if other ways to get that data, but it’s a value calculated and reported by the BMS directly it seems.
islandbayy
Active Member
SMT has released an update for Android. A pretty big re-design, and now includes the CAC Values.
@re/cell Maybe I should have put this in a pm or messaged your website, but have kept it public in case anyone else has meaningful comment.
I have 2014 MS 85 with approx 75k miles on it. Just before I bought it, three years ago, it had a battery under warranty. Only I suspect that it was repaired rather than brand new.
The car runs fine at present (not wishing to tempt fate).
However, I have noticed a massive trend in 2014 MS battery failures recently, and most have already been replaced under warranty.
I have been through your (excellent) website and the only stumbling block is that I am in the UK.
Hopefully I will never need to call on your services, but it is starting to look like when rather than if.
On your website, you make it clear that you do not want to touch cars out of the USA as it is not practical and you do not want to touch just batteries - i.e. you want the whole car.
Assuming that I could get the car or battery shipped to you at my expense, would you be prepared to carry out the work? (I work in the shipping industry and may be could get it there at a good rate - although EV batteries are a hot topic in shipping right now).
Do you have a a ball park price to replace a 2014 MS85 battery? Feel free to PM me if that is better business wise.
At present this is all academic, but should the worst happen, I like to know what I will do about it.
I have 2014 MS 85 with approx 75k miles on it. Just before I bought it, three years ago, it had a battery under warranty. Only I suspect that it was repaired rather than brand new.
The car runs fine at present (not wishing to tempt fate).
However, I have noticed a massive trend in 2014 MS battery failures recently, and most have already been replaced under warranty.
I have been through your (excellent) website and the only stumbling block is that I am in the UK.
Hopefully I will never need to call on your services, but it is starting to look like when rather than if.
On your website, you make it clear that you do not want to touch cars out of the USA as it is not practical and you do not want to touch just batteries - i.e. you want the whole car.
Assuming that I could get the car or battery shipped to you at my expense, would you be prepared to carry out the work? (I work in the shipping industry and may be could get it there at a good rate - although EV batteries are a hot topic in shipping right now).
Do you have a a ball park price to replace a 2014 MS85 battery? Feel free to PM me if that is better business wise.
At present this is all academic, but should the worst happen, I like to know what I will do about it.
to be clear, work outside the US is always a consideration, never off the the table. understandably, the issue is really international shipping logistics, especially when the physical car is involved, as potential importation issues come into play if it’s a physical car.
provided shipping can be arranged, and we’re always happy to expand our logistics capabilities, we are more than happy to take on ANY pack.
In fact, we already do this today as part of our Preferred Installer program.
provided shipping can be arranged, and we’re always happy to expand our logistics capabilities, we are more than happy to take on ANY pack.
In fact, we already do this today as part of our Preferred Installer program.
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