I ran a Lithium for a few years, I just converted back to a sealed battery as I needed one ASAP and was being povo.
They hate the cold. On cold Targa mornings they appear to go dead flat, but come back to life once they have some load on them. I ended up going to the car of a cold morning and turning the lights on for a few mins so I could start the car.
You will want to keep the car on a trickle charger too, as once they go below a voltage level they never come back to life.
I took the life out of mine when my alternator failed and I drained the battery a few times in a day.
I ran the 550ca from here http://www.tuningworx.com/#!wwwlithiumaxcomau/sitepage_12