Terry
I use these batteries in both my boats. I get them at Advance Auto around $150. 12" x 9" x 6" Here is a link for some coupons. You can order online and then pick it up at the local store. You can get an additional 15% off by signing up for their eMail! Check it out
Coupon Link
Advance Auto Link
The OPTIMA BlueTop is ideal for those who need a sure-starting, strong cranking, maintenance-free power source.
Optima BlueTop D31M group 31 batteries are the most powerful and have the largest energy storage capacity. Ultra high-Performance Spiralcell AGM (absorbed glass mat) dual-purpose battery for marine and RV. Blue Top has 3x the cycling capability (rechargeability) with ultimate cranking power for your boat or RV in a maintenance-free package. Perfect for multiple high-demand accessories and trolling
motors with 15x the vibration resistance and lighter weight. Lower internal resistance provides more efficient power output and faster recharges.
Cold Cranking amps 900
Cranking Amps 1125
Reserve Capacity 155
Capacity (c/20 rate) 75
Post Type Dual SAE & 5/16 Stainless Stud
Weight 59.8lbs.
Length 12.19inches
Height 9.38inches
Width 6.56inches