If you're looking for a gel cell, I keep all of the NAPA blue and black tops in stock. They are stronger than the OPTIMAS but not very cheap ($179 and $229 respectively). But, I can tell you that those who have been by the shop have seen our truck out there for 10 hours a day with full power 60 watt strobes on and no battery charger. Starts right up every night for my drive home with NO problems. My old Optima yellow top could go about 6 hours before someone had to remember to start it. These batteries are ridiculous.