Group 31's are what you need. Go over to Voltex on Buford Hwy, pull around to the back door and tell them you need Group 31 blems. Should run you around $30-$35 each (used to only be $25 each). The regulars go for around $85-$90, so make sure you get blems. They will last just fine. Mine usually last around 5 years before they need replacing, but you need to have a good charger for them and take care of them to get optimal life out of them. Hit me or Josh up if you need info. I need to run over and pick up 2 more myself soon also.