[shawntech]

Originally Posted by TurtleBoy

As I said, just about every charger out there will use around 14v for charging. Also keep in mind, there is no magic volt number to get the install to work. While it did for the OP and me, it didn't for others or for me on the M340i.

I got close with my USB pack but it won't supply 14v for very long, my m340 had this problem for 3/2023 and dealer had to update but I sold it to a friend and he had no problem updating with OTA without connecting anything. Nor did any of my x3 m40i friends. I had hoped my m850 would be solved as well. I only have small 1-4a battery tender devices and they won't supply enough to please the car.

[shawntech]

Went and got a centech battery charger, set 12v 40a boost mode and it worked... We are up to date!

[TurtleBoy]

Originally Posted by shawntech

Went and got a centech battery charger, set 12v 40a boost mode and it worked... We are up to date!

I don't see an AGM mode, are you sure that has one? If not I wouldn't use it.

[shawntech]

Originally Posted by TurtleBoy

I don't see an AGM mode, are you sure that has one? If not I wouldn't use it.

I was just using to supply 13.6v to charge points only, batteries been trickle charger several times.

[TurtleBoy]

Originally Posted by shawntech

I was just using to supply 13.6v to charge points only, batteries been trickle charger several times.

I understand but it is an AGM battery so AGM battery chargers/maintainers are what is recommended.

[shawntech]

Originally Posted by TurtleBoy

I understand but it is an AGM battery so AGM battery chargers/maintainers are what is recommended.

Tnx

[VegasX5702]

Originally Posted by shawntech

What power supply are you using to achieve 14v?

I used this one off of Amazon: https://a.co/d/gazTJse

[VegasX5702]

Originally Posted by shawntech

I got close with my USB pack but it won't supply 14v for very long, my m340 had this problem for 3/2023 and dealer had to update but I sold it to a friend and he had no problem updating with OTA without connecting anything. Nor did any of my x3 m40i friends. I had hoped my m850 would be solved as well. I only have small 1-4a battery tender devices and they won't supply enough to please the car.

While the update was installing on my car, the car was requesting between 10A-30A during the update at 14.0V.

[TurtleBoy]

Originally Posted by VegasX5702

I used this one off of Amazon: https://a.co/d/gazTJse

I would avoid using that one also since it is designed for LiOn batteries and not AGM. Occasional use probably will not hurt.

[labphoto]

I followed:

(1) I plugged the trickle charger, waited until fully charged. ~12 hours
(2) I checked iDrive, but no message to upgrade software.
(3) iDrive off. I used Bimmerlink and cleared all errors (not just the head unit errors, but all). Charger still connected. iDrive on, no message to upgrade.
(4) Let trickle charger top off the battery again
(5) I repeated step #3 again
(6) This time I got the install prompt when I turned on iDrive, I accepted, let it upgrade.


I used a Schumacher SC1281 to charge the battery and left connected during the above process.

[VegasX5702]

Originally Posted by TurtleBoy

I would avoid using that one also since it is designed for LiOn batteries and not AGM. Occasional use probably will not hurt.

Agreed.

I only use it to maintain 14.0V voltage for updating and programming, after I use my 4A Duracell Battery Charger (https://a.co/d/fChn8YQ) to charge it to 90-100%. That Duracell one should be good for AGM charging.

[Deauto]

Hello Guys,
So i did the update,
In these steps
1. connected the obd
2. started bimmercode
3. I selected that i have mounted a new battery
4. check battery status ( it was 100%)
5. clear the codes
6. restarted the idrive( push vol button with ignation on for 10 sec)
7. and the update button was there( lets update)

[pshovest]

Originally Posted by VegasX5702

I used this one off of Amazon: https://a.co/d/gazTJse

While that adjustable power supply may lack BMW "Approval", it does exactly what BMW recommends for charging.....charge at constant voltage. It is suitable for both AGM and Li-ion. User will have to set the voltage properly and pay attention to disconnect charger when charge is complete.

Charge AGM at constant 14.8v until current reaches to 2.5 amp.
Charge Li-ion at constant 14.0v until current reaches 2.5 amp.