Bought an RV with 8 Optima Blue Top Marine Batteries, Group Size D34M, 750 CCA. They sat dormant for a year before I bought it and now won't hold a charge. Is
OPTMA 8052-161 BLUE TOP GROUP 31 MARINE DEEP CYCLE
Optima Blue Top BT DC 5.5 12V 75Ah Marine Dual Purpose Accu - Accu Service Dreumel
OPTIMA Batteries 8052-161 - D31M Group 31 BLUETOP Dual Purpose (Deep-C – I&M Electric