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Should LFP batteries be charged to 100%?
- Thread starter SaffaT3sla
- Start date
ErikJupiter
Closed
I supposedly took delivery of an LFP SR+. My delivery sales person was not particularly confident when I asked that question. In the waiting room thread, a couple users have suggested that some of the cars recently delivered have actually been NIC vehicles on canceled orders. So, I’m wondering how to tell whether my car is actually an LFP battery pack car. When I plugged it in at home, and selected the charge limit of 100%, I did NOT see a “daily” and “trip” advisory. Perhaps that is a good indicator that I do indeed have an LFP vehicle?
HenryT
Active Member
Apparently Tesla has a 60kwh variant of the LFP battery. I think Bjorn Nyland also mentioned about an increased capacity in one of his SR+ cars he tested recently.
when do we think these cars might come to the UK?
when do we think these cars might come to the UK?
Lord Farquad
2022 MYLR W/B/20s/Tow bar. Previously 2021 M3SR+
I think Bjorn showed the 55kwh LFP originally had a large “buffer” so only 49kwh useable. After a recent OTA update it now has 53kwh usable (smaller buffer) due to better management software. I imagine that’s a worldwide update to all the 55 LFPs?
ErikJupiter
Closed
I took delivery yesterday of an LFP car here in the U.S. Right now at 100% it is about 250 miles. However, on other threads I see recent purchasers, after an update, getting 262.
Mine shows 264 (miles) range after a 100% charge, the same as it showed when I collected it 6 months ago.
I don’t consider that reading to be particularly relevant, what matters is what you actually achieve, that of course varies every time you drive (subject to all the factors that determine what range you get (such as ambient temperature, rain/ dry roads, speed you drive at, etc etc)
I’m unable to tell you if that range has changed following any of the OTA updates I’ve had since I collected the car.
The buffer may have decreased by 4 kWh but due to the miriad of factors controlling actual range I believe it’s impossible to say if any additional (or less) achieved range might be due to buffer reduction or other controlling factors.
The European owners manual is clear on how to determine if you have an LFP battery pack:
ErikJupiter
Closed
I'd assume that when the manual gets its next update it will include that section as some US vehicles are now being supplied with LFP packs.
Here is the additional detail applicable to LFP vehicles:
ErikJupiter
Closed
Super helpful. Thank you. I expect one reason they recommend to charge to 100% at least once a week is that the LFP battery voltage does not drop significantly as the battery discharges, making it difficult for the car to calculate range. Fully charging once in a while gives the car more data to calculate range.
Mine (from Dec 2020), showed 418km (~259-260 miles) for months ... and since I've been on 2021.24.x, it's been slightly decreasing (lost a few km/miles).
ThisOur Fiesta only does 50mpg; what happened to the other 20mpg I paid for? [Just an inappropriate jest ... but ... you know ...] In truth the electric car world probably does slightly better than the petrol world in representing its ranges but we're working with smaller margins so, understandably, it does make us panic a bit!
Difference in range between advertised and achieved is not an electric car problem!
Besides, my last ICE car only had a range IRL of 290 miles, and it was costing £85 to fill up every time. I'll panic far less about using 'fuel' when I pick up my M3 on Wednesday.
Eh? Why would regen braking not be in full effect?
Unless you fully charge and then immediately start rolling down a hill, you should have used more energy to get up to your speed than you can recover with regen (it isn't 100% efficient) - so it's not as though the battery would be too full to take back the energy.
Am I missing something?
Possibly because regen strength doesn't have linear correlation with the SoC. I don't know for sure but it seems plausible that at high SoC like 95%+ there would be some drop off.
At max. regen the energy created is more than can safely be put into the battery pack when it is almost fully charged. The charge rate has to be greatly reduced to avoid overcharging individual cells.
Lord Farquad
2022 MYLR W/B/20s/Tow bar. Previously 2021 M3SR+
What usable capacity do you think you’re Mic LFP has? Ive got a 2021 SR+ Mic which was delivered on the 30th Sep. I’ve done 500 miles and it’s bloody fast and very efficient. My first 500 miles have been around 200wh/mi.
But……
On my current charge I’ve averaged 186wh/mi, covering 70 miles and used 29% (13kWh). Unless my Maths is out that only gives me a 44-45kWh battery. I thought these were 55kWh with a usable around 53kWH? I’m up to date with software.
The Energy graph is predicting 212mi and the basic range display is 184mi remaining.
Effectively the % seems the odd one out.
Thoughts?
But……
On my current charge I’ve averaged 186wh/mi, covering 70 miles and used 29% (13kWh). Unless my Maths is out that only gives me a 44-45kWh battery. I thought these were 55kWh with a usable around 53kWH? I’m up to date with software.
The Energy graph is predicting 212mi and the basic range display is 184mi remaining.
Effectively the % seems the odd one out.
Thoughts?
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