I am looking at batteries to power a 12 Vdc motor in my garage and want to know if size matters. I can get a very large 12 v battery from Sam's wholesale for under $100. This is a commercial duty, tractor battery. It is rated @ 1300 CCA and about 105 amps per hour. However, they have a deep cycle battery that is rated @ 995 CCA and 165 amps per hour? Is a bigger battery better? Will it last long to charge and drain several times a month? Will it hold a charge longer than the deep cycle?