I have that Varta battery on mine. Absolutely no problems with it since fitting early December (I think). I can leave it two/three weeks and know that I can press the accelerator pedal fully down to prime the oil for a few seconds with confidence that it will still crank and start on the second press of the button.
I did have an issue with fitting it though. One of the terminals was too small for the clamp on the cable. I had to get some shims to pack out the terminal from
Amazon. It will be interesting to hear if you have the same issue.