VMAX XTR8D-350 8D 12V 350Ah Deep Cycle AGM SLA 12 Volt 350Ah Battery Upgrades Any Group 8D Battery 12 Volt 350Ah Group 8D Heavy Duty "Xtreme" series battery by VMAXTANKS Dimension: 20.8"L x 11.1"W x 9.0"H (9.8"h to top of terminals) Terminals Posts: SAE+3/8" STUD (Posts included) Bulk charging voltage required: 14.4-14.9V; Float voltage: 13.5V Excellent for Solar/Wind backup for home or business, boats, and other uses where a Group 4D battery is required