My M4 is pretty much cabined up for the winter now. With my previous cars I have always connected the battery up to my Optimate 6 when off the road for long periods to keep it ready to go. I hadn't realised the M4 has a LiOn battery which means I cannot use the Optimate 6.
So my question: Do you think this will be suitable
http://www.optimate.co.uk/optimate%20lithium.htm
Any other suggestions?