You might want to ck out one of these, I've had good luck with them, and they have a 2yr replacement warranty, and I had to use it a couple of yrs ago, I had left the ign on?, killed the ign, and the battery came back, but not for long, but when I emailed them about it, all I had to do was send them a copy of my receipt, then take off the top of the old battery, about .060 thick panel, put it in an envelope, and send it back, and I had a new battery in a couple of days. The one I use is an MBTX16U, a 16ah 350cca AGM. Runs about $75.00 including shipping. The Company is MotoBatt, out of Florida, size is 5.85X3.23X5.51, and weighs about 7lbs. Course if you got the big bucks, you can go for the Lithium Ion, starting at about $225.00, and they recommend a $75.00 charger. I use mine for ignition, and instrument lights, and starter, and it's a total loss system, and I never have to charge it at the track. I buy mine off Ebay, they have the shipping included sometimes. Just another option. Bob!