OPTIMA BLUETOP STARTING & DEEP CYCLE BATTERIES

Patented Spiralcell Technology means more running time, faster recharge and twice the life of traditional marine and RV batteries. Plus, it's spill-proof, can be stored longer and has 15 times the vibration resistance, not to mention superior heat resistance. 12V. Dual SAE and 5-16" SS stud. D31M model fits group size 27 marine boxes and trays.