The walmart everstart marine batteries are good and have a 2 year free replacement warranty where most others only have a 1 year replacement. I think the biggest thing with marine batteries is to always get them back charged up as soon as possible for longer battery life. The "smart battery chargers" are also a battery's life saver also just plug them up and they do what ever the battery needs unlike the old battery chargers that we use to have. Also remember that wet cell batteries are wet always keep a check on the water in them and always use distilled water and do not under or over fill them.