How to Find The Battery Capacity In The BMW i3 

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Thanks for this little tutorial! Checked my 2015 i3 battery today, and the capacity is 17.4kWh out of 18.2-18.8 when new. 4-8% degredation after 6 years and 63000km. Very pleased with that - seems like the battery is high quality.

Just about to buy an i3, so thanks for this useful video on capacity. It would be impossible to check without help such as yours, since it is so hidden deep in the menu

Why the hidden menu battery reading is NOT an indicator of battery health. Max Kappa is the BMS estimated snapshot capacity at that point in time, its based on external factors (temperature, current load), coulomb count, these factors are then fed into a statistical model to provide an educated guess of what the current capacity of the pack. There is no way to display the battery SoH on an i3. (But it's almost certainly fine, as many have done 100,000 miles with no noticeable degradation. BMW did a good job of making sure the car looks after the battery well.) The best thing you can do is to regularly leave it on AC charge until **and after** it has reached 100% charge capacity. This is when cell balancing takes place. This information (on how cell balancing is managed on the i3) was given to some lucky owners who were given a workshop tour at the BMW UK HQ.

This was really helpful. Thanks. More like this would definitely be welcomed! 🙏🏽

Very useful video when buying an i3. Really appreciate it

Great video thanks so much... I got 28.6 for my 17 with 40 000 miles happy with that.. ...had the car for ages but never tried doing... I'll be more concerned nearing 8 years lol.. Thanks again!

Fantastic video. Thank you so much for this great information. And also thank you for not saying VIN number.

Very useful …Thank you for making this video

This was really helpful! Thanks for posting. I'm about to go look at a pre-owned i3. Wondering if there's anything else not obvious to a non-expert to look out for.

Brilliant. 2 and a half year old i3S 42kw 19,000 miles bat capacity is 38.7. Hardly ever rapid charged it, I only ever trickle charge it on a 3 pin at home in the garage 👌🏼

Super helpful. Thank you!

Thank you just bought 2017 BMW i3 Rex 2days ago so I am learning.

Thanks - very helpful ❤

Thank you for this very informative video!!

Really useful :)

Thank you

Very useful thanks

Hi, nice video and glad to see an author responding to community comments ! I just purchased a 2017 94Ah bmw i3 70 000 kms, the battery capacity is 27,5 kWh on 33 kWh. But what is exactly the net capacity of the car when it was new ? Because 83,33% of health is not very good… also it’s winter time, don’t know if it decrease the result. Is there a way to increase the capacity ? Thank you for your answer 😊

I found this bc I was looking to swap an I3 battery pack into my FIAT 500e. I read it can be done fairly easily as the individual cells are the same size/same mfr(Samsung) However, BMW pack is 33 or 42 kWh(depending on year), where the FIAT pack is only 24kWh

Very helpful, thank you. My 2014 i3 Bev with only 16k miles only has 94% battery kappa. Primarily level one and occasional level two. Cant DC charge.

I have a 2019 94ah (28.3kwh) i3 with 90,000 miles - checked today and it is showing 27.7kwh available. Incredible.

Hello. So I have watched your video many times I’m not sure if I missing something but after I push and hold to unlock I put in my number but after that it doesn’t have anything other then unlock. Any ideas? Thanks

@BMWblog - I could use interpretation assistance. The usable capacity is always less than the possible battery capacity (e.g., 2019 is 42kw, but per some sources, only 38kw is usable). So which number should the output of this hidden menu be compared against? (just ran it on a possible-to-purchase used 2019 i3 and got 38.9kw; since this is higher than 38, I think that's a good thing?)

Thank you so much for a great video! This may be a silly question, but is this net, or gross battery capacity you see? I got 38,9KWh at my 2019 model.

Nice video. Do you have video about Park Assistant?

nice thx

Very helpful. I'd also like to know what the cost is to replace a battery pack in the US. Thx.

Hi. I’ve done this on my i3 before but when I just tried I only got the message “reset not possible” on the screen. Any ideas?

I checked on mine today, bought yesterday, 38,5 120ah 2019. What is soc when new?

Hay un error en tu calculo, la degradacion no es 70%, debes calcular contra la capacidad utilizable, no la bruta. Me parece que tienes mas del 90% disponible

Mine 5.5 year old 2017 i3 94ah show 27.4 kw at 83000km, but its 4 degrees outside. Curious to see if this number actually changes with temperature. Ill check again when its around minimum 10 degrees. Also I rarely fast charge, but I did fast charge 2 times yesterday for the first time since last summer. I read that fast charging doesnt adjust cells voltage, and the cell with lowest voltage is the calculated capacity. But charging "slow" allows the car to adjust the cells voltage and equal them and with that possible to gain some capacity.

Thank you very helpful! I have a 2014 with a 22kwh battery My test showed 14.6. Can you tell me if this should be of concern

Hi, thanks for the tip, does it also work the same way for hybrid BMWs?

but how much battery kw was usable when the battery was new? Although its a 33kw battery, isn't only 30kw was available?

Hi, i am about to buy a bmw i3 100k miles 42kw model 2015 and battery capacity showing 15.4 is that ok ?

Hi thank you for the informative video. By any chance do you know what to do when the display screen doesn't match the battery status? For instance Yesterday we charged the vehicle in a charger point station, it took more than 1 hour to charge the vehicle from 9% to 35% but just we we finally finished. I tuned on the vehicle (2015 bmw i3) And the display was at 14% but the battery display was at 35% This car its a freaking nightmare

Hi i have problem with my bmw i3 stock on drivetrain

i’m still a little confused on the kWh score .. is a lower kWh score better or the other way around ? thanks for the info !

Is 29.6 highest number possible on 2017 rex? Thanks.. Great video!

Hi I would love your advice on this. I’m looking at a used 2015 w/range extender and the battery capacity is at 15.1. It has 22k miles on it. It’s been in mainly warm weather (FL, TX, AZ, CA). Would this be worth it, if I drive about 75 miles daily for work?

I recently bought a used 2014 bmw i3 rex at 54K miles. Batt.Kapa Max is at 15.8 kWh, is this a good number?

God I hate single button multi function operation, it is so unintuitive, oh just press and hold it for 3 seconds oh, just hold it in for 10 seconds, LOL

How do you get the temperature to display on the screen?

Hi I have BMW i3 2017 model and when I charge it full it’s showing 71miles only , can you help on this

Hi, I found 2015 i3 with 25000 KM, as you are user of i3 do you recommend me to buy this car? My yearly car use is 12-14k KM.

What are your thoughts about a 2014 60ah with Rex, 68000km on the clock and battery at 75% (13,5) ? Is it too risky?

Went to the mechanic and had the 12 volt battery changed mileage went done from 92 to 56 is the 56 range normal or is there a way to reset this. Car has about 42000 miles

For a 2014, would 12kwh and 67% battery "ladung" be ok? What does this mean exactly?

My kappa shows 13.1 max @95% charge 2015 rex. Is this bad? 96k miles

I have a 2014 i3 Rex. Status says 14.4 kWH out of 18. I still get 65 to 75 miles on a full charge. Do you know how that can be with this battery depredation?

29.6 kWh is the gross capacity, which is supposed to be 33.2 for a new car? Is that correct? This would be a loss of 3.6 kWh capacity.

I got a 2015 i3 I did the test and I got 16.2 out of 22 should I start get worried??🤔

My 14 rex 70.7k shows 15.6 kwh but while flashing…?

hi my name is chuck i live in sarasota i checked my battery on my i3 like you said and put in my vin number and its a 2015 model with extended range and it said my battery was like 15.1 not sure if that means its used 15 percent of its life but my problem is i bought the car last week and when i charge it on my house charger on 110 ac it will only charge to 58 miles but the honda dealership i bought it from said it would charge to about 72 to86 miles per charge can you tell me what it should charge at

Anyone upgraded their battery through BMW? Cost?

Is it worth to buy 7 years ago with 91000 mile on it ?

❤❤🎩

Go Gophers

That's 94% capacity - so it's just 6% degraded?

ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-qaR_zTThOrk.html En français pour info

This was great. Thanks

Hello. So I have watched your video many times I’m not sure if I missing something but after I push and hold to unlock I put in my number but after that it doesn’t have anything other then unlock. Any ideas? Thanks

Hello. So I have watched your video many times I’m not sure if I missing something but after I push and hold to unlock I put in my number but after that it doesn’t have anything other then unlock. Any ideas? Thanks