Product Description
Deka 8A31DTM AGM Deep‑Cycle Battery
The 8A31DTM is part of the respected Deka Marine Master series, known for rugged AGM construction and dual‑purpose performance that handles both cranking and deep‑cycle demands. Its sealed AGM chemistry ensures maintenance‑free, leak‑proof operation—ideal for marine, RV, solar or backup use where reliability matters. With high cold‑cranking and ample reserve capacity, it excels in wet‑environment and high‑vibration applications like boats and industrial equipment. The generous 105 Ah capacity and efficient recharge behavior mean less time charging and more time powering your gear. Made in the USA and backed by a one‑year warranty, the 8A31DTM delivers proven quality, longevity, and value-packed performance for both starting and cycling roles in harsh environments.
8A31DTM Features:
- Dual-Purpose AGM Performance – Combines deep cycle capacity with strong starting power for marine and RV systems
- High Tolerance to Deep Discharges – Delivers long service life even in demanding deep‑cycle conditions
- Heavy Vibration Resistance – Rugged construction ideal for marine, RV and industrial environments
- Premium AGM Technology – Completely spill-proof and maintenance-free design
- Exceptional Cycle Life – Up to twice the life expectancy of standard lead-acid batteries
- Faster Charging – Marine Master batteries spend more time in service by recharging faster than conventional batteries
- Dual Terminal Design – 5/16" studs and SAE automotive posts for flexible installations
- Proudly Made in the USA – Manufactured by East Penn and backed by a 1-Year Warranty
Why Choose the 8A31DTM?
The Deka 8A31DTM is a versatile 12 Volt AGM dual‑purpose battery from Deka’s Marine Master line, providing 105 Ah of deep-cycle capacity, 800 CCA, and sealed maintenance‑free construction. This Group 31 replacement battery delivers reliable engine starting and durable deep-cycle power in one maintenance-free, spill-proof package.
Applications
- Marine starting and trolling motor power
- RV house battery and engine start support
- Solar energy storage and off‑grid power systems
- Backup power & UPS systems
- Industrial equipment, generators, telecom
- Golf carts, mobility vehicles, recreational equipment
8A31DTM Cross‑Reference
Group 31 replacement for battery models: 1031MF/PMF, 1131MF/PMF, 1231MF/PMF, 31‑PC2150S, 7T31, 7T31P, 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
Important: Always confirm your battery's dimensions, terminal configuration, and specifications before purchase to ensure proper fit.
| Voltage | 12V |
| Capacity | 105Ah |
| Type | Dual Purpose AGM |
| Cold Cranking Amps | 800A |
| Group Size | 31 / 31M |
| Terminals | 5/16" Studs (hardware included) & SAE Posts |
| Polarity | + Left / - Right |
| Length | 12.9" |
| Width | 6.8" |
| Height | 8.5" 9.4" w/terminals |
| Weight | 68 lbs |
Extend the Life of Your Battery
Keeping your battery charged between uses with a quality maintainer is essential for maximizing its lifespan. Save 10% on a NOCO Genius 10, the waterproof NOCO GENPRO 10 or Battery Tender 26A Chargers & Maintainers when bundled with battery using the option above.
