Product Description
VMAX XTR8D-310 AGM Marine Starting Battery
The VMAX XTR8D-310 12V deep cycle marine battery delivers true dual-purpose AGM performance, combining 1,200 cold-cranking amps with a 310Ah deep-cycle capacity in a standard Group 8D case. It’s built for applications that need both strong starting power and long, reliable runtime—without a compromise.
Engineered using VMAX’s military-grade AGM construction, the XTR8D-310 features thick internal plates, tightly packed separators, and a sealed, maintenance-free design. The result is excellent vibration resistance, high output, and durability that holds up in the toughest environments.
Ideal for inverter systems, houseboats, off-grid power, commercial equipment, and other high-draw applications, the XTR8D-310 is a dependable upgrade when reliability, endurance, and versatility matter.
Features & Benefits
- High Cranking Power – 1,200 cold cranking amps ensure reliable starting power in all weather conditions.
- 310Ah Deep-Cycle Capacity – Designed for frequent deep discharges without loss of capacity.
- AGM Construction – Heavy-duty plates with Absorbed Glass Mat separators for extreme durability.
- Heavy Vibration Resistance – Rugged construction ideal for marine, RV, and industrial environments.
- Group 8D – Direct-fit replacement for many marine, RV, and commercial equipment applications.
- Low Self-Discharge – Maintains a charge longer between uses than conventional flooded batteries.
- Temperature Tolerant – Dependable starting power in both high and low temperatures.
- Dual Terminal Design – 3/8″ Studs + SAE Automotive Posts provide versatile connections.
- Built for Commercial Use – VMAX takes pride in building Tough Batteries for Tough Applications.
VMAX Xtreme Series AGM
VMAX Xtreme AGM batteries are engineered for applications that demand high power and zero excuses. Built with thick, military-grade lead plates and tightly compressed AGM separators, they deliver true deep-cycle endurance, fast recovery, and consistent output—day after day.
These batteries are purpose-built for high-demand environments – inverter banks, off-grid systems, mobility equipment, trolling motors, and industrial machinery. You get rugged construction, long runtime, and maintenance-free reliability in a single platform that handles both starting bursts and sustained cycling. When failure isn’t an option and compromises cost you time, VMAX Xtreme AGM is built to perform.
| Voltage | 12V |
| Capacity | 310 Ah / 4.1 kWh |
| Type | Dual Purpose AGM |
| Cold Cranking Amps | 1,200 Amps |
| Marine Cranking Amps | 1,550 Amps |
| Group Size | 8D |
| Length | 20.8" (528 mm) |
| Width | 10.6" (269 mm) |
| Height | 8.7" (221 mm) 9.5" (241 mm) w/terminals |
| Terminals | 3.8" Studs (HW included) & SAE Posts |
| Weight | 170 lbs |
| Charging Current | 20 - 80 Amps |
| Charging Voltage | 14.6V - 14.8V |
| Float Voltage | 13.5V - 13.8V |
| Float Service Life | 10 - 12 Years |
| Warranty | 1 Year |
For additional specifications – XTR8D-310 Datasheet
XTR8D-310 Battery Cross-Reference
Replacement for Group 8D Batteries: 12CRV8D, 708D, 8A8D, 8D-AGM, 8D-MHD, 8D-XHD, 8G8D, 908DFT, BB8D, CSA8D-1200, DC260-12, GPL-8DA, GPL-8DL, LFP12300BH, ODP-AGM8D, RB300, S12-290AGM, SLI8DAFT, SLI8DB, SLIDAGMDP, T716, T904, T975, T978, UB-8D.
