WARNING!!!!!

Here is a tip, do not use a CTEK charger on AGM and RECOND mode at the same time.
Unless you would like to kill your AGM Battery over night!

This was my concern about these Chargers and having them connected while the Battery was in the vehicle!!!
Thankfully, i killed another AGM Battery that was out of the vehicle
Before killing the one in it and probably some expensive sensitive other stuff.

AGM Battery, really dont like voltages over 14.4v or 14.7 if its cold.

The CTEK in AGM mode, with RECOND mode also selected provides 15.8 volts @ 1.5 Amps.

You can expect your $$$ AGM to be dead by morning.
Dead as in killed, toss it in the bin.

As to what 15.8volts does to anything else in your BMW, i have no idea, but its probably not good.

You have been warned.