For various aftermarket installs, you need constant power, that if available somehow in the cabin today, may not be with a future software update. Enter the Frunk "12v" battery, for small loads.
But in the 2022+ MY's (and 2023+ M3, and I believe the latest refresh MS/X) it is not a 10mm nut post on a traditional Lead Acid 12v battery. It is a tap point pictured below with what seems to be a 1/2" bolt, I trust connecting to the ~16v Li Ion battery that replaces.the Lead Acid version. Thankfully all the aftermarket additions I install have been designed to work off around this voltage, also.
I am not keen on what a lot of aftermarket install guides seem to be implying, by not advising the best way to make constant contact with that is... wrapping a wire around the bolt and pushing the rubber protector back on. So am planning to use a nut to hold a lug connected to the + wire of the kit, onto the bolt firmly. However to avoided galvanic corrosion, anyone know, or know how I can test, what material the bolt is made out of?
But in the 2022+ MY's (and 2023+ M3, and I believe the latest refresh MS/X) it is not a 10mm nut post on a traditional Lead Acid 12v battery. It is a tap point pictured below with what seems to be a 1/2" bolt, I trust connecting to the ~16v Li Ion battery that replaces.the Lead Acid version. Thankfully all the aftermarket additions I install have been designed to work off around this voltage, also.
I am not keen on what a lot of aftermarket install guides seem to be implying, by not advising the best way to make constant contact with that is... wrapping a wire around the bolt and pushing the rubber protector back on. So am planning to use a nut to hold a lug connected to the + wire of the kit, onto the bolt firmly. However to avoided galvanic corrosion, anyone know, or know how I can test, what material the bolt is made out of?
