My 5260 battery that came with the tractor is now dead after many years of operation. It is a GROUP 58 battery. I was looking to replace it but wanted to know if a group 58 with 550 cold cranking amps was actually necessary to run the starter and iginition coil or if I could go with a smaller style lawn tractor battery with 200 or 220 CCA's. Can you all share what you're using in your walk behinds and make some recommendations? A new Group 58 could be as much as 150$ but a lawn tractor battery is 50$.