I have a 1981 Honda Goldwing gs1100. It currently has an Everstart ES50N18A2 battery that needs to be replaced. I am thinking of replacing it with ES50N18A3 because I already have one. What is the difference between EverStart ES50N18A2 and ES50N18A3 batteries? Can I have one as a replacement for the other? I would really appreciate your useful information. I hope to hear at the earliest from you guys out there. Thanks.