MADE IN THE USA!
Free ShippingProduct Specifications for Deka Marine Master 8G31DTM Group 31 Marine Gel Battery [12V, 98Ah]
| BM Part #: | GEL-8G-31DTM |
|---|---|
| Brand: | Deka |
| Made In: | U.S.A. |
| Battery Polarity: |
|
| Voltage: | 12 Volt |
| Cold Cranking Amps: | 550 CCA |
| Capacity: | 98 Ah |
| Terminals: | SAE |
| Type: | Gel |
| Battery Size: | Group 31 |
| Length: | 12 15/16" (329mm) |
| Width: | 6 3/4" (171mm) |
| Height: | 9 3/8" (238mm) |
| Shipping Weight: | 76.00Lbs |
| Warranty: | 12 Month |
| Rechargeable: | Yes |
- Made in the USA. Why it matters:
- Superior craftsmanship; rigorously tested; high-quality parts.
- Recombinant Gel Technology: Permanently sealed electrolyte eliminates spills, fumes, and water top-offs entirely.
- 98Ah Deep Cycle Capacity: Powers trolling motors and onboard electronics through full days on the water.
- 180-Minute Reserve Capacity: Keeps essential marine systems running longer when your engine is off.
- Power-Perform Full-Frame Plates: Engineered for extended cycle life with a specialized oxide plate formulation.
- Ultra-Low Self-Discharge Rate: Retains less than 2% charge loss per month, ideal for off-season storage.
- Made in the USA by East Penn: Domestic manufacturing backed by a 12-month free replacement warranty.
Product Description
If you've dealt with a flooded marine battery before, you know the frustration: checking water levels, worrying about acid spills, and wondering every spring whether it survived winter storage. The Deka Marine Master 8G31DTM is built to put those worries behind you.
This Group 31 marine gel battery uses recombinant gel technology, which permanently locks the electrolyte in a thick gel matrix. There are no cell caps to open, no fluid levels to monitor, and no free liquid to spill if the battery gets jostled on a rough day. Once it's installed, you can focus on being on the water.
Built to Handle Every Season
Gel batteries are particularly well suited to seasonal use. The 8G31DTM retains its charge far better during storage than flooded alternatives, so you're less likely to pull it out in the spring and find it damaged from sitting discharged all winter.
When you are running, this battery is designed for the long haul. Its Power-Perform full-frame plates are engineered to withstand hundreds of deep discharge cycles, giving you a longer service life than typical flooded or entry-level batteries.
Strong Enough to Start, Deep Enough to Troll
At 550 CCA and 780 MCA, the 8G31DTM delivers solid cranking performance in cold conditions, making it a legitimate dual-purpose option for boats that need both starting power and sustained deep cycle capacity.
It's a natural fit for high-draw applications, including:
- Trolling motors (Minn Kota Terrova, Minn Kota Ultrex, MotorGuide Xi5)
- Marine house power and onboard electronics
- RV and camper battery banks
- Solar and off-grid power systems
Flexible Installation, American-Made Quality
The sealed, non-spillable construction allows flexible mounting in tight or unusually positioned compartments on boats, RVs, and off-grid setups. Dual SAE and stud terminals make it straightforward to connect across most marine and RV configurations.
The 8G31DTM is manufactured in the USA by East Penn, one of the most respected names in lead-acid battery technology, and backed by a 12-month free replacement warranty from Battery Mart.
Important: The 8G31DTM requires a gel-compatible charger. Using a standard flooded or AGM charger profile can damage the battery and void your warranty. See compatible charger options below.
Ready to stop dealing with maintenance headaches? Add the Deka 8G31DTM to your cart for fast shipping from our US warehouse.
Frequently Asked Questions
Do I need a special charger for the Deka 8G31DTM?
A: Yes. The 8G31DTM requires a charger with a dedicated GEL charge profile. Using a standard flooded or AGM charger can overcharge the battery, cause internal damage, and void your warranty. Compatible options include the NOCO GENIUS10 and the NOCO GENPRO10X1 onboard marine charger, both available on our site.
Will this battery work with my trolling motor?
A: In most cases, yes. The 8G31DTM is compatible with popular Group 31 trolling motor setups, including the Minn Kota Terrova, Minn Kota Ultrex, and MotorGuide Xi5. If your motor specifies a Group 31 deep cycle battery, this is a direct fit. Not sure? Contact our team and we'll confirm compatibility for your specific setup.
What is the difference between this gel battery and an AGM battery?
A: Both are sealed and maintenance-free, but they work differently. Gel batteries use a silica-thickened electrolyte that is better suited to slow, deep discharges and long periods of inactivity, which makes them a strong choice for trolling motors and seasonal marine use. AGM batteries generally accept faster charge rates and deliver higher peak power bursts. One important note: both types require a charger matched to their specific chemistry.
Can the 8G31DTM be mounted on its side or in a tight compartment?
A: Yes. The sealed, non-spillable design allows the battery to be safely installed in virtually any orientation. This makes it well suited to boats, RVs, and off-grid systems with limited or awkward battery compartments. Just confirm your tray accommodates the Group 31 footprint: 12-15/16" L x 6-3/4" W x 9-3/8" H.
Is this the same battery as the Deka Intimidator 8G31?
A: They share the same core battery construction, but they are not identical. The Marine Master 8G31DTM adds marine terminal studs alongside the standard SAE posts, which is what the "M" at the end of the part number indicates. This makes it a better choice for marine applications where stud connections are preferred. It is a direct replacement for Group 31 gel, AGM, or flooded lead-acid batteries.
Cross Reference & Compatibility
- Ace Hardware 8G31DTM
- Alliance Truck Parts ABP AE8G31DTM
- Astrolite 8G31DTM
- Autocraft G31DT-48
- AutoPride G31DTM
- BATTERIES PLUS SLIG31DTM
- Carquest Canada 8G31DTM
- CARQUEST G31DT-48
- Centenial CB31-GEL
- Chrome Battery CB31-GEL
- Deka 8G31DTM
- DIEHARD G31DT-48
- Duracell SLIG31DTM
- East Penn 8G31
- Exide PV-31
- Factory Motor Parts 8G31DTM
- Federated G31DTM
- Fisher G31DTM
- HD Plus 8G31DTMGEL
- Komatsu EP8G31DTM
- Mighty Max ML100-12GEL
- MK Battery M31 SLD G
- NAPA 8272
- NAPA BAT8G31DTMGEL
- NAPA Canada 8G31DT
- NAPA Export 8272EX
- Parts Master G31DTM
- Parts Plus PV-31DTM
- Pow-R-Surge 8G31DTM
- PRO-SERIES MP31GEL
- Resource Power G31DTM
- ROAD RUNNER GEL31DT
- Trojan T31-GEL
- TruckPro DB8G31DTM
- West Marine 15020399
This battery can be used in these models:
- Airstream Classic RV House Power
- Invacare TDX SP2 Heavy Duty Power Wheelchair
- Minn Kota Terrova Trolling Motor
- Minn Kota Ultrex Trolling Motor
- MotorGuide Xi5 Trolling Motor
- Permobil M3 Heavy Duty Power Wheelchair
- Renogy Off-Grid Kit Solar Power Backup
- Winnebago Forza RV House Power
Note: This list is not exhaustive. If you need help finding your battery, contact us and we'll find the right battery for your specific needs.
Customer Reviews
Exactly what I had ordered and arrived incredibly fast. I will definitely shop at BatteryMart again. The price was the most competitive. Highly recommend!
An exact replacement delivered promptly.
great service and delivery
Using in a Crown lift. Charged up when first installed. In use every day for 3 weeks still working. Holds charge very well.
I have two of these batteries. I love them. They are kind of heavy when considering weight limits for a boat but I have no other complaints. I also use them for solar. Works excellent but you must do the math for proper amp hours. I'm going to buy four more.
