[TomBMW]

So, BMW doesn't make things easy. My Li-Ion Battery is dead. I tried several things to resurrect it, but no luck. If you guys have any ideas, please chime in.

Please don't chime in and say warranty this take to dealer, buy a new Li-Ion at the dealer etc., it's not helpful. This will end up helping a lot of people in the future that do not want to spend 2k at the dealer for an Li-Ion battery, if the Li-Ion can be bypassed on the F80/F82, there has to be away to do it on the G80/G82.

So for the F80 / F82, you can simply buy an IBS negative cable and then code an AGM battery to the car, simple, easy.

I tried this for the G82 and it doesn't work. The IBS cable on the battery only has 1 lead, whereas on the F80 / F82 it has 2 leads.

Anyone have any idea how to get the IBS connector to work with only 1 LIN lead?

You see the new G82 Li-Ion battery only has 1 lead as shown in the picture. I also attached the LIN cable pig tail and it only has 1 lead to it as well.

[DocWeatherington]

Originally Posted by TomBMW

So, BMW doesn't make things easy. My Li-Ion Battery is dead. I tried several things to resurrect it, but no luck. If you guys have any ideas, please chime in.

Please don't chime in and say warranty this take to dealer, buy a new Li-Ion at the dealer etc., it's not helpful. This will end up helping a lot of people in the future that do not want to spend 2k at the dealer for an Li-Ion battery, if the Li-Ion can be bypassed on the F80/F82, there has to be away to do it on the G80/G82.

So for the F80 / F82, you can simply buy an IBS negative cable and then code an AGM battery to the car, simple, easy.

I tried this for the G82 and it doesn't work. The IBS cable on the battery only has 1 lead, whereas on the F80 / F82 it has 2 leads.

Anyone have any idea how to get the IBS connector to work with only 1 LIN lead?

You see the new G82 Li-Ion battery only has 1 lead as shown in the picture. I also attached the LIN cable pig tail and it only has 1 lead to it as well.

Have you confirmed the battery is dead and not in safety mode?

Have you tired different chargers? Or pulled the battery and taken it to a shop for confirmation?

I'm not aware of anything as it's a different platform and old options are no longer an option as the tech has advanced.

[TomBMW]

Hi, no I haven't. How do I get it out of safety mode?

Originally Posted by DocWeatherington

Have you confirmed the battery is dead and not in safety mode?

Have you tired different chargers? Or pulled the battery and taken it to a shop for confirmation?

I'm not aware of anything as it's a different platform and old options are no longer an option as the tech has advanced.

[TomBMW]

I have a guess, I'm thinking the missing pin is for the 12v POWER supply for the IBS, and the other is the data cable. There's no ground obviously becasue the whole cable is a ground cable. I guess I'll have to test this out.

[DocWeatherington]

Originally Posted by TomBMW

Hi, no I haven't. How do I get it out of safety mode?

https://g20.bimmerpost.com/forums/sh....php?t=1994351

https://www.bimmerpost.com/forums/sh...php?p=29847203

https://www.bimmerpost.com/forums/sh...php?p=29848912

BATTERIES WITH "UNDER VOLTAGE PROTECTION"

Some Lithium-ion batteries have an on-board UVP (under volt-
age protection) that disconnects the battery to avoid it becom-
ing too deeply discharged. This prohibits the CTEK charger
from detecting that there’s a battery connected. To bypass this,
the battery charger needs to open the UVP.

By pressing the RESET-button for 10 seconds, the charger
opens the UVP. During this process, the charging STEP 7 is
lit. Once the UVP has been opened and the battery is ready
to be charged, the charger automatically starts the charging
cycle.

[2quick]

Originally Posted by DocWeatherington

https://g20.bimmerpost.com/forums/sh....php?t=1994351

https://www.bimmerpost.com/forums/sh...php?p=29847203

https://www.bimmerpost.com/forums/sh...php?p=29848912

BATTERIES WITH "UNDER VOLTAGE PROTECTION"

Some Lithium-ion batteries have an on-board UVP (under volt-
age protection) that disconnects the battery to avoid it becom-
ing too deeply discharged. This prohibits the CTEK charger
from detecting that there’s a battery connected. To bypass this,
the battery charger needs to open the UVP.

By pressing the RESET-button for 10 seconds, the charger
opens the UVP. During this process, the charging STEP 7 is
lit. Once the UVP has been opened and the battery is ready
to be charged, the charger automatically starts the charging
cycle.

Came across this. Browsing around on Ctek chargers. I plan on getting the Ctek 56-926 soon. Which i assume is a good choice. For my 24 M3 when it gets here. Will not forget to do this. If it doesn't start to charge right away. Thanks!

[DocWeatherington]

Originally Posted by 2quick

Came across this. Browsing around on Ctek chargers. I plan on getting the Ctek 56-926 soon. Which i assume is a good choice. For my 24 M3 when it gets here. Will not forget to do this. If it doesn't start to charge right away. Thanks!

No problem what forum friends are for

[turbojg]

Originally Posted by 2quick

Came across this. Browsing around on Ctek chargers. I plan on getting the Ctek 56-926 soon. Which i assume is a good choice. For my 24 M3 when it gets here. Will not forget to do this. If it doesn't start to charge right away. Thanks!

Keep in mind that charger has an output of 4.3 amps so it is fine as a maintenance charger but not good if you need a fast charge. The G8X battery has a capacity of 70 amp hrs so 70/4.3=16 hrs to charge to full capacity if you are lucky.

[2quick]

Originally Posted by turbojg

Keep in mind that charger has an output of 4.3 amps so it is fine as a maintenance charger but not good if you need a fast charge. The G8X battery has a capacity of 70 amp hrs so 70/4.3=16 hrs to charge to full capacity if you are lucky.

Thanks! Unfortunately, i already bought it. Guess i hope i don't ever need a full charge right away.

[Mike02z]

I just picked up this one. My 22 X3MC had AGM but the 24 G82 has Lithium. I wonder if this is why I would get a “Battery Maintenance” warning as I was using an AGM charger….

CTEK 56-926 LITHIUM US | Fully Automatic Lithium Ion Phosphate LiFePO4 Battery Charger | 5.0Ah - 60Ah | Maintenance Charging up to 120Ah https://a.co/d/f6L7cCw

[Hit_Apex]

The newer G82 uses an updated IBS / LIN BUS protocol for which the aftermarket will eventually address. tom @ eas may have an update from Antigravity on their progress.

[tom @ eas]

In development. No details to share at the current moment.

[fanofbmwe46]

Should reset be pushed when plugged into wall and connected to battery? Or just when plugged into wall? Or either?

[turbojg]

Originally Posted by fanofbmwe46

Should reset be pushed when plugged into wall and connected to battery? Or just when plugged into wall? Or either?

Plugged in and connected to the battery.

[turbojg]

Originally Posted by Mike02z

I just picked up this one. My 22 X3MC had AGM but the 24 G82 has Lithium. I wonder if this is why I would get a “Battery Maintenance” warning as I was using an AGM charger….

CTEK 56-926 LITHIUM US | Fully Automatic Lithium Ion Phosphate LiFePO4 Battery Charger | 5.0Ah - 60Ah | Maintenance Charging up to 120Ah https://a.co/d/f6L7cCw

The G8x cars have a 70AH battery. This charger is rated up to a 60 AH battery for a regular charge. Once a battery is charged this charger can take over and maintain that full charge for up to a 120 AH battery. I am not sure if can charge a battery that is fully discharged. That would be a good question for the manufacturer or possibly answered by someone who has attempted to do so.

What I recommend if you have a dead battery is to jump start the car and let the car run (or drive it) to charge the battery from the alternator. Once the battery is at full charge you can then put the maintenance charger on it.

Here is a % charge vs voltage chart. I'm not sure what the exact low voltage cut off is but I would guess it is 12 volts as typical cutoff for a Lithium battery is 3 volts per cell 4 cells = 12 volts

Do not use a charger designed for Lead acid or AGM as the charging voltage is too high and can damage the Lithium battery. However if you are getting "Battery Maintenance" warnings I would guess it is because of how low the capacity is of the M batteries and how fast they discharge. Part of the problem I think is how long it takes for the car to go to sleep after the door is closed each time you enter it and the car isn't run.

Keep in mind you only have a .5 volt change to get from full charge to 30% capacity and a 1 volt change to get from full charge to to cut off.

[turbojg]

I recommend carrying a good quality Lithium jump started in the car and have your manual key (in the key fob) handy (as you cannot open the door when the battery is dead)

[N54andS63TU]

Any update tom? I'm trying to fit antigravity too

[tom @ eas]

Originally Posted by N54andS63TU

Any update tom? I'm trying to fit antigravity too

Making progress. Will update once we are completed on the R&D side.

[jwoo]

Very interested too. Will this work for an AGM swap?

[jwoo]

I have the same problem, I wonder if you can use the negative cable from a G87 M2 (AGM battery)that has the IBS connection?

[Hit_Apex]

Originally Posted by jwoo

I have the same problem, I wonder if you can use the negative cable from a G87 M2 (AGM battery)that has the IBS connection?

It doesn't work on the G80/82 like it does on the AGM equipped G87.