Having upgraded my M3W's banner to a Lithium battery my old CTEK is gathering dust. Needless to say I'm using another CTEK unit now as I found it pretty foolproof.
Specs at https://www.ctek.com/uk/products/car/xs-0-8-uk
"The XS 0.8 is a compact, fully automatic 6 step charger that delivers 0.8A and charges 12V batteries from 1.2 to 32Ah and maintenance charging up to 100Ah"
Not sure if a 4-wheeled mog would benefit but certainly helped my M3W's battery last 4 years!
Seem to be going for £50 on fleabay so I would ask for £25 shipped within UK including crocodile clips and circular terminal plugs - looks "as new" condition except I didnt keep the box!. Note if you get one of these for a M3W you can use an accessory adapter that plugs into the "cigarette lighter socket" which is connected to the battery and good enough for conditioning (but note I am not selling mine as I am using it for my new CTEK unit!)
Please PM me if interested.