Ctek charger - connectors for the battery?

[BuffUpdate]

Greetings, everyone.

I own a Ctek 5.0 charger equipped with a new cable (CTEK 56-261) for hardwiring in the engine compartment near the battery terminals. Is there anybody who can provide guidance on their removal? Does it resemble hex in the center of the post? The vehicle is a 640D.
Where should I attach the negative side, considering the cable is around 40 cm length for hardwiring?


Thank you.

[MamaKiddo]

Unfamiliar with the 640d, but I presume the battery is located in the trunk and there are just jump points beneath the hood?
If so, use a T50 to remove the nut for the positive connection; the negative will again be on the inner wing. I believe that a T50 is required for its removal.

[BuffUpdate]

Thank you, the battery is located in the trunk. I will ascertain if I own a T50.

[Talentrews]

I have linked mine to the battery and have never had any issues.
For eight years, I have connected the CTEK charger to one of my automobiles once a month during the weekend.

[BuffUpdate]

The issue is that the IBS is located at the negative terminal of the battery, necessitating a connection to an other grounding point. BMW recommends the terminals located in the engine compartment.

[MamaKiddo]

To connect to the battery, attach it directly to the positive terminal and the ground terminal; alternatively, you may connect the ground to the bolt of the bracket securing the battery, since it does not affect functionality whether it is connected there or to the ground terminal.

[Inspirli]

On my F36, the hardwire is connected to the positive terminal of the battery, while the negative is attached to the chassis in the boot. I connect the charger in the driveway once a week for about half a day; otherwise, due to my limited excursions, a new battery lasts just one year.

[Talentrews]

I removed the 10mm nut from the terminal clamp, reattached the connection, and then replaced the nut.