[Jon D]

Can anyone in the UK recommend a compatible battery charger/conditioner for my 840d? My old CTEK CTE-MXS5.0 5A charger won't work, presumably because it's not specifically for cars with stop/start tech, although it worked perfectly well on my last car, a 2016 640i which had start/stop.
It looks like the CTEC CT5 start/stop will be fine. Can anyone confirm or offer alternative suggestions?
Thanks and Merry Christmas to all.

[Seaford]

Originally Posted by Jon D

Can anyone in the UK recommend a compatible battery charger/conditioner for my 840d? My old CTEK CTE-MXS5.0 5A charger won't work, presumably because it's not specifically for cars with stop/start tech, although it worked perfectly well on my last car, a 2016 640i which had start/stop.
It looks like the CTEC CT5 start/stop will be fine. Can anyone confirm or offer alternative suggestions?
Thanks and Merry Christmas to all.

Have you tried it with the bonnet shut? My NOCO Genius 5 wouldn’t work on my 330i or 840i with the bonnet open - presumably something to do with current being drawn by heaven knows what with the bonnet open. Works fine with the bonnet shut.

[Jon D]

Originally Posted by Seaford

Have you tried it with the bonnet shut? My NOCO Genius 5 wouldn’t work on my 330i or 840i with the bonnet open - presumably something to do with current being drawn by heaven knows what with the bonnet open. Works fine with the bonnet shut.

Thanks for that, I'll give it a try before I buy a new charger.

[Beemer5to3]

Originally Posted by Seaford

Have you tried it with the bonnet shut? My NOCO Genius 5 wouldn’t work on my 330i or 840i with the bonnet open - presumably something to do with current being drawn by heaven knows what with the bonnet open. Works fine with the bonnet shut.

Even with the bonnet on the catch? My Genius 5 seems to work ok like that.

[Seaford]

Originally Posted by Beemer5to3

Even with the bonnet on the catch? My Genius 5 seems to work ok like that.

Never tried it - I just close the bonnet, making sure the charger cable isn’t going to get mashed.

On both my 3 Series it was easy to drop the mains plug through the engine bay so it exited under the car…not so easy on the 8!

[M8Bimmer]

I just run the cord up the windshield side. Lots of room to close the hood fully.