[F87source]

Originally Posted by doug_999

Believe it or not, Ctek recommends directly connecting to the battery - but I agree, I just go with the terminals up front.

FYI re AGM charging: https://smartercharger.com/faq/#batteryknowledge6



Not according to Ctek...
https://smartercharger.com/faq/#batteryknowledge6

BMW doesn't (it's in the manual) advise connecting to the battery, Ctek does because not all cars have IBS sensors. So if you connect directly to the battery the car cannot control the charging itself which could be bad.