Product Description
VMAX XTR31-135 – High-Output Dual-Purpose AGM Marine Battery
The VMAX XTR31-135 is engineered for boaters, RV owners, and power users who need a battery that can deliver both explosive engine-starting power and long-lasting deep-cycle performance. With 1,150 cold-cranking amps and a robust 135Ah of usable capacity, this 12V AGM Group 31 battery supports high-thrust trolling motors, large inverter loads, and demanding onboard electronics while still providing strong, confident starts every time you turn the key.
Built using VMAX’s military-grade AGM design, the XTR31-135 offers extreme vibration resistance, secure sealed operation, and exceptional durability in harsh marine and off-road environments. Whether you’re powering a trolling setup all day, running a full electronics suite, or building a reliable house bank, this battery gives you the strength, stability, and endurance needed for serious recreational and commercial use.
Features & Benefits
- High Cranking Power – 1,150 cold cranking amps ensure rapid, reliable engine starts in all weather conditions.
- 135Ah Deep-Cycle Capacity – Delivers long runtime for trolling motors, inverters, lighting, pumps, and onboard electronics.
- Military-Grade AGM Construction – Heavy-duty plates with high-porosity separators resist shock, vibration, and extreme use.
- Dual Terminal Design – 5/16″ studs plus SAE posts provide versatile connection points for marine, RV, and industrial wiring.
- Group 31 – Direct-fit replacement for many marine starting, house bank, solar storage, and commercial equipment batteries.
- Vibration & Impact Resistant – Ideal for boats, RVs, off-road rigs, utility vehicles, and mobile equipment.
- Low Self-Discharge Rate – Holds a charge for months, making it dependable for seasonal or intermittent use.
- Built for demanding applications – Supports heavy use in mobility devices, utility vehicles, scrubbers, and more.
Why the VMAX XTR31-135 Is a Top Choice for Marine, RV, and Off-Grid Power
As part of the VMAX Xtreme AGM series, the XTR31-135 is built for users who demand maximum reliability from their power system. Its thick military-grade plates and tightly packed AGM separators provide the deep-cycle endurance needed for long days on the water, extended off-grid stays, or heavy daily commercial use. At the same time, its high cranking output ensures dependable engine starts even after hours of accessory draw.
From trolling motors and inverter banks to mobility devices and industrial machinery, this battery excels in applications where rugged construction, long runtime, and maintenance-free operation matter. When you need a battery that performs in tough conditions and delivers multi-purpose capability without compromise, the VMAX XTR31-135 is built to handle the job.
| Voltage | 12V |
| Capacity | 135 Ah |
| Type | Dual Purpose AGM |
| Marine Cranking Amps | 1,500 Amps |
| Cold Cranking Amps | 1,150 Amps |
| Group Size | 31 / 31M |
| Length | 12.90" |
| Width | 6.77" |
| Height | 8.66" 9.84" w/terminals |
| Terminals | 5/16" Studs (HW included) & SAE Posts |
| Polarity | + Left / - Right |
| Weight | 78 lbs |
| Charging Current | 13 - 20 Amps |
| Charging Voltage | 14.4V - 14.9V |
| Float Voltage | 13.2V - 13.8V |
| Float Service Life | 10 - 12 Years |
| Warranty | 1 Year |
For additional specifications please reference the XTR31-135 Datasheet
XTR31-135 Battery Cross Reference
Replaces Group 31 Batteries: 1031MF/PMF, 1131MF/PMF, 1231MF/PMF, 31‑PC2150S, 7T31, 7T31P, 8A31DTM, 8G31, 8G31DTM, CT2500, DC31DT, DP31CS, DP31DT, DURHR12-430C/FR-A, HEPPC2150T-M, MB137-120, MR137-120, NSB‑AGM31, ODX‑AGM31, SLI31AGM, SLI31AGMDPM, SLI31CS, SLI31DTMAGMDC, SLI31DP, SLI31MDC/MDCP, SLI31PA/SA, SLI31PHP/SHP, SLR125, XCA31-1400, XTR31-135.
