Product Description
MR137-120 Marine Deep-Cycle Battery
The VMAX MR137-120 12V deep cycle battery delivers true AGM performance with a 120Ah capacity in a Group 31 case. It’s built for applications that need strong, steady power for extended periods.
Engineered using VMAX’s military-grade AGM construction, the MR137-120 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.
Features & Benefits
- 120Ah Deep-Cycle Capacity – Designed for frequent deep discharges without loss of capacity.
- High Output – 900 cranking amps ensure reliable power in all weather conditions.
- 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 31 – Direct-fit replacement for numerous marine, RV, and off-grid 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.
- M8 Insert Terminals – Includes new hardware for quick installation and secure connections.
- Left-Positive Polarity – Verify your current battery's terminal locations before purchase.
- Built for Commercial Use – VMAX takes pride in building Tough Batteries for Tough Applications.
VMAX Marine Series AGM
VMAX Marine deep cycle batteries are engineered for applications that demand consistent 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 tough environments – from marine electronics & trolling motors, to house power banks & commercial equipment. You get rugged construction, long runtime, and maintenance-free reliability in a single platform that handles long power draws and sustained cycling. When failure isn’t an option and compromises cost you, VMAX Marine AGM is built to perform.
| Voltage | 12V |
| Capacity | 120 Ah |
| Type | Deep-Cycle AGM |
| Marine Cranking Amps | 900A |
| Group Size | 31 |
| Length | 12.90" (328 mm) |
| Width | 6.80" (173 mm) |
| Height | 8.50" (216 mm) 8.70" (221 mm) w/terminals |
| Terminals | M8 Inserts (HW included) |
| Polarity | + Left / - Right |
| Weight | 75 lbs |
| Charging Current | 8 - 35 Amps |
| Charging Voltage | 14.4V - 14.9V |
| Float Voltage | 13.5V - 13.8V |
| Warranty | 1 Year |
