Got heaps of those batteries here Mik. Put a 40ah in our spare pulsar about 4 years ago, can leave it for months and still goes.Put a 36ah in my ute (a14) 5 years ago and still goes well. Can start the little tractor with a 36ah (45HP Leyland) without any problems. Have got a good s/h 36ah here if you want it or can get you a big new 80ah for about $150 if you wanted one.