Need new battery for dixie chopper. Have Kawasaki engine. First battery lasted 7 years. Last 2-3 years had to charge first thing in the spring well this time that's not doing it. Came with battery that has 300 cca been fine and I think book says 500 or 550 cca. Most stores have some in 200's and 300 or 340. Should I get 300, 340 or look for the 500? Thanks