Product Description
SLR50 Group 21R Deep Cycle Battery
The VMAX SLR50 12V deep cycle battery delivers true AGM performance with a 50Ah capacity in a compact Group 21R case. It’s built for use in RV's, and off-grid energy storage applications that need lasting, steady power for extended periods of time.
Engineered using VMAX’s military-grade AGM construction, the SLR50 features thick internal plates, tightly packed separators, and a sealed, maintenance-free design. The result is excellent durability that holds up in the toughest environments.
Note: Group 21R batteries have reversed terminal polarity vs a standard Group 21 battery. Check for proper polarity if the locations are critical in your application.
Features & Benefits
- 50Ah 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.
- Vibration Resistance – Rugged construction that's ideal for RV, marine, and mobile environments.
- Low Self-Discharge – Maintains a charge longer between uses than conventional flooded batteries.
- Temperature Tolerant – Excellent performance in both high and very low temperatures.
- Group 21R – Replacement or upgrade for numerous marine, RV, and off-grid applications.
- M6 Insert Terminals – Includes new hardware for quick installation and secure connections.
- Left-Negative 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 SLR Series AGM Batteries
VMAX SLR Series AGM batteries batteries designed to deliver dependable deep-cycle power, day in and day out. Constructed with military-grade lead plates and sealed AGM technology, these batteries deliver consistent performance with zero maintenance and extremely low self-discharge. They’re engineered to handle deep cycling, long standby periods, and heavy vibrations—making them ideal for solar systems, RVs, marine applications, and backup power.
Available in capacities from 50Ah to 200Ah, the SLR Series scales easily to match your power requirements without compromise. Whether you’re running off-grid or preparing for outages, VMAX SLR batteries hold their charge, cycle cleanly, and are built to perform—year after year.
| Voltage | 12V |
| Capacity | 50 Ah |
| Type | Deep-Cycle AGM |
| Group Size | 21R |
| Length | 7.80" (198 mm) |
| Width | 6.60" (168 mm) |
| Height | 6.70" (170 mm) |
| Terminals | M6 Inserts (HW included) |
| Polarity | - Left / + Right |
| Weight | 32 lbs |
| Charging Current | 3 - 15 Amps |
| Charging Voltage | 14.4V - 14.9V |
| Float Voltage | 13.5V - 13.8V |
| Warranty | 1 Year |
SLR50 Battery Cross-Reference
Group 21R Batteries: CT1250, MB86-50, MR86-50.
Important: Always confirm your battery's electrical specifications, dimensions, and terminal configuration before purchase.
