[tom @ eas]

Originally Posted by ToneM2

Couple questions, I only see F87 M2 as on option on Bimmercode, did you use that to code? Some of us used Bimmercode to change some things and we used 3 Series/M3 G20 G80 option to do so.
Does a battery tender work on this type of battery? Might be putting my car in storage for a month or 2 depending on how bad winter is here in NY, another option would be to swap the OEM battery back in the car when its going to be sitting for long periods or out in below freezing temperatures.
Also, surprised to hear you say G80/G82 platform is much more complicated than the G87. I thought they were very closely related.

Tried to reply to your post last night, but the forum went down for server maintenance in the middle of posting.

You bring up a good point. At this time Bimmercode only supports up to F87, which is fine for battery coding on G87. When you get to the Battery Registration part on Bimmerlink, you can see the value is successfully read at 60Ah (instead of 90Ah), which is what we previously coded the new battery at using Bimmercode.



If sitting for long periods of time, you can opt for the Antigravity Battery Tracker to monitor voltage as needed from your iPhone/Android, otherwise you will need a LiFePO4-specific charger as not to damage the battery.

Originally Posted by RichP

I'm safe in assuming these batteries are not compatible in vehicles that have AGM batteries as the only option? I have a Volvo V60 Polestar and this would be ideal: Unlike in a BMW where the battery is low and in the back, the Volvo battery is pretty much above the engine, above the front wheels. Losing 40lbs there would be significant.

Absolutely. I've been running a AG battery in our Tesla Model Y Performance successfully for the past 2 years, as 20-22 models come with a really cheap lead acid battery that typically craps out in a couple of years for the 12V system.

[DSTR]

Originally Posted by M2siast

Did you have a metal pen in the glovebox though? Put one in there and report back if it understeers.

Montblanc of course. Understeer with style .....

[///M TOWN]

40 lbs is like going on a diet

Why the fuck not

[M2siast]

Originally Posted by ///M TOWN

40 lbs is like going on a diet

Why the fuck not

Because it costs $1,000.
And it doesn’t work in various temperature conditions.

To name 2.

If it worked in all temperatures, this is something I’d consider when/if my original battery died. Say the AGM battery is $500, and this is $1,000, I’d pay the premium.

For most use cases, paying $1,000 to reduce the weight of the car by 39 lbs (not sure where the 40 lbs figure came from lol), it’s a no for most people. You can’t feel it, does nothing for the car, but sure losing weight everywhere is beneficial. If it wasn’t for the downsides…

It’s like saying you’ll remove the rear seats. Saves even more weight… but you lose the rear seat, and the car gets louder inside. Everything has a purpose and a reason.

[G30M]

Originally Posted by GregW / Oregon

M2 auto is listed as 52.1/47.9. Removing 40 lbs. from the rear would change it to 53.1/46.9. Remember that fuel load can vary the rear weight by as much as 80 lbs.

these guys weighed their M2
no driver + full tank
F:R 52.2 : 47.8
total 3762 lbs


driver + full tank
51.9 : 48.1
total 3929 lbs

so without fuel front will go up another 1%? making it 53:47?

no 50:50
also that's static

when you drive there is constant weight transfer.
when you brake this car it will be something like 60:40 - 80:20 depending on how hard you brake

hence porches are 40:60, during acceleration the rear is weighted nicely, during braking the rear doesn't get too light - so it won't drift as much, but we all want to drift, so we get the M2

[baron95]

Originally Posted by F32Fleet

Okay, so then why buy this Li battery? Just so you can tick it off the box of alleged improvements over stock?

Because reducing weight is valuable. It improves acceleration, braking and turning (specially on transitions). It reduces consumables on track (tires, brakes). It makes the car more lively and enjoyable.

20 lbs or so by going to forged wheels, 40 lbs or so by going to Li-Ion battery, alone are a drop of > 1.5% of the weight of the car. Not eart shattering, but meaningful.

[F32Fleet]

Originally Posted by baron95

Because reducing weight is valuable. It improves acceleration, braking and turning (specially on transitions). It reduces consumables on track (tires, brakes). It makes the care more lively and enjoyable.

20 lbs or so by going to forged wheels, 40 lbs or so by going to Li-Ion battery, alone are a drop of > 1.5% of the weight of the car. Not eart shattering, but meaningful.

LOL. Okay so reducing total weight by a couple of lbs is valuable but possibly upsetting 50/50 weight distribution is completely irrelevant. You are aware that this makes no sense right?

[baron95]

Originally Posted by F32Fleet

LOL. Okay so reducing total weight by a couple of lbs is valuable but possibly upsetting 50/50 weight distribution is completely irrelevant. You are aware that this makes no sense right?

I never said static weight distribution makes no difference. I said changing it by 1% or so makes little difference. I, as a driver, can balance a car dynamically with throttle and brake application as needed. And dynamic weight distribution is what the tires feel.

Lowering weight pays dividend everywhere. And I, as a driver, can do nothing about extra weight.

I have no idea why you are being so derisive and argumentative. We are just sharing ideas about how to improve our cars. You don’t need to use any of the ideas.

Cheers.

[ToneM2]

Originally Posted by tom @ eas

Tried to reply to your post last night, but the forum went down for server maintenance in the middle of posting.

You bring up a good point. At this time Bimmercode only supports up to F87, which is fine for battery coding on G87. When you get to the Battery Registration part on Bimmerlink, you can see the value is successfully read at 60Ah (instead of 90Ah), which is what we previously coded the new battery at using Bimmercode.



If sitting for long periods of time, you can opt for the Antigravity Battery Tracker to monitor voltage as needed from your iPhone/Android, otherwise you will need a LiFePO4-specific charger as not to damage the battery.



Absolutely. I've been running a AG battery in our Tesla Model Y Performance successfully for the past 2 years, as 20-22 models come with a really cheap lead acid battery that typically craps out in a couple of years for the 12V system.

I was wondering what happened, I received a notification that you replied but I couldn’t find it.
Any insight as to why the G80/G82 is more complicated to swap the battery? Doesn’t the M3/M4 already come equipped with a Li-Po battery?

[MNoob]

Reading this thread thinking about all the stupid shit lotus owners do to shave 16 grams.

I’d spend $1k to drop 40 lbs.

[tom @ eas]

Originally Posted by MNoob

Reading this thread thinking about all the stupid shit lotus owners do to shave 16 grams.

I’d spend $1k to drop 40 lbs.

Right? Grams!

[chmura]

Will this work on a 2019 M2c?

To my understanding there is no Lithium setting on the M2c? But I have read people install these on their cars.

[Ojala]

Anyone have issues with cold charging of the lithium batteries? I build custom lithium battery packs (12v 100ah-200ah) for vehicle surveillance packages. In my experience the lithium batteries don't like charging below freezing. I get around that by installing automatic battery heaters along with the BMS. Different use case than a vehicle starter and accessory battery but I am curious about others experience.

[tom @ eas]

Originally Posted by chmura

Will this work on a 2019 M2c?

To my understanding there is no Lithium setting on the M2c? But I have read people install these on their cars.

There is a Lithium setting in Bimmercode for your F87.

[GregW / Oregon]

Originally Posted by Chris Dominguez

Anyone have issues with cold charging of the lithium batteries? I build custom lithium battery packs (12v 100ah-200ah) for vehicle surveillance packages. In my experience the lithium batteries don't like charging below freezing. I get around that by installing automatic battery heaters along with the BMS. Different use case than a vehicle starter and accessory battery but I am curious about others experience.

Driving my F82 below freezing there was never an issue with charging, even though the trunk mounted battery was subject to those temps. With a battery in the engine compartment it is naturally heated when driving. Now static charging I do not know.

[Ojala]

Originally Posted by GregW / Oregon

Driving my F82 below freezing there was never an issue with charging, even though the trunk mounted battery was subject to those temps. With a battery in the engine compartment it is naturally heated when driving. Now static charging I do not know.

I was thinking about static battery tender charging. Then I realized I never even said that. I'll catch up one of these days

[Cruise'n]

BMW are legendary with car balance.
Small or Large they are all near perfect 50:50
Could this not be in their equation to have extra weight in this spot. To change could effect? the handling of the car I wonder 🤔