Deka Marine Master 8A31DTM 12V 105Ah AGM Deep Cycle Battery

Deka 8A31DTM 12V 105Ah AGM Deep Cycle Battery – Group 31

Deka

$337.95
SKU:
DEKA-8A31DTM
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Voltage:
12V
Type:
AGM
Capacity:
105Ah
Group Size:
31M
Terminals:
SAE Studs
Terminals:
SAE Posts
Polarity:
+ Left / - Right
Deep Cycle:
Yes
Dual Purpose:
Yes
Length:
12.5" - 12.9"
Width:
6.5" - 6.9"
Height:
8.5" - 8.9"
Weight:
67.5 lbs
Capacity Group:
100 - 200Ah
Group Size:
31
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Product Description

DEKA 8A31DTM AGM Deep Cycle & Starting Battery

The 8A31DTM is a premium Group 31 AGM battery from the Deka Marine Master series, designed to deliver both reliable deep cycle energy and strong starting power. Built with advanced Absorbed Glass Mat (AGM) technology, this maintenance-free battery is ideal for Marine, RV and commercial applications that require consistent performance and durability in demanding environments. This dual-purpose AGM battery with 105 Ah capacity is engineered to handle deep discharges while still delivering powerful cranking amps for engine starts. The sealed design resists vibration, prevents electrolyte leakage, and allows for flexible installation positions. Whether you're powering trolling motors, RV's, or mobility applications, the DEKA 8A31DTM offers superior cycle life, faster recharging, and long-lasting energy.

Features & Benefits

  • Dual-Purpose AGM Performance – Combines deep cycle capacity with strong starting power.
  • High Tolerance to Deep Discharges – Delivers long service life with frequent deep cycle use.
  • Group 31 Replacement – Direct-fit for many marine, RV, and commercial equipment applications.
  • Heavy Vibration Resistance – Rugged construction ideal for marine, RV and industrial environments.
  • AGM Construction – Heavy-duty plates with Absorbed Glass Mat separators for greater durability.
  • Temperature Tolerant – Dependable power over a wide range of ambient temperatures.
  • 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.
  • Dual Terminal Design – 5/16" studs and SAE automotive posts for flexible installations.
  • Made in the USA – Proudly manufactured by East Penn for trusted performance and quality.

Why Choose DEKA Marine Master Batteries?

The Deka Marine Master Series offers unmatched reliability and versatility for dual-purpose power needs. Whether you're cruising open waters, camping off the grid, or installing backup power solutions, these AGM deep cycle battery deliver worry-free performance, faster recharging, and superior lifespan—making them a top-tier option for recreational or industrial battery applications.

Deka Marine Master
8A31DTM Specs
Voltage 12 Volts
Capacity 105Ah
Group Size 31 / 31M
Type Dual Purpose AGM
Cold Cranking Amps 800A
Marine Cranking Amps 1000A
Reserve Capacity 200 Minutes
Terminals M8 Studs
(hardware incl.)
& SAE Posts
Polarity + Left / - Right
Length 12.94" (329 mm)
Width 6.75" (171 mm)
Height 8.50" (216 mm)
9.37" (238 mm)
w/terminals
Weight 67.5 lbs (30.6 kg)


Deka Marine Master 8A31DTM Datasheet
Deka Marine Master Series Information

Deka 8A31DTM Battery Cross-Reference

Group 31 Batteries w/Automotive Posts: 1031MF/PMF, 1131MF/PMF, 1231MF/PMF31M, 31M-AGM, 31MDP, 8A31DTM, 8G31DTM, D31M, DC31DT, DP31CS, NSB-AGM31M, ODX-AGM31M, PC2150M, SLI31AGM, SLI31AGMDPM, SLI31DP, SLI31DTMAGMDC, SLI31MDC, SLI31MDP, SLI31PA/SA, SLI31PHP/SHP, SRM-31, XCA31-1400, XTR12-155, XTR31-135.

Group 31 Batteries w/Studs or Bolt Terminals: 31M, 31M-AGM, 31MDP, 31‑PC2150S, 7T31, 7T31P,  8A31DTM, 8G31, 8G31DTM, CT2500, D31M, DC31DT, DP31CS, DP31DT, DURHR12-430C/FR-A, HEPPC2150T-M, NSB‑AGM31, NSB-AGM31M, ODX‑AGM31, ODX-AGM31M, MB137-120, MR137-120, PC2150M, SLI31AGMDP, SLI31AGMDPM, SLI31CS, SLI31DP, SLI31DTMAGMDC, SLI31MDC, SLI31MDP, SLI31PHP/SHP, SLR125, SRM-31, XCA31-1400, XTR12-155, XTR31-135.

Group 31 Batteries w/Dual Terminals: 31M, 31M-AGM, 31MDP, 8A31DTM, 8G31DTM, D31M, DC31DT, DP31CS, NSB-AGM31M, ODX-AGM31M, PC2150M, SLI31DP, SLI31AGMDPM, SLI31DTMAGMDC, SLI31MDC, SLI31MDP, SLI31PHP/SHP, SRM-31, XCA31-1400, XTR12-155, XTR31-135.

Important: Always confirm your battery's dimensions, terminal configuration, and specifications before purchase to ensure proper fit and performance.

Recommended Chargers for the 8A31DTM

NOCO Genius 10 Amp Charger & Maintainer

NOCO GENPRO 10 Amp Waterproof Charger & Maintainer

Battery Tender 23 Amp Charger & Maintainer

Applications

  • Marine: House battery banks, trolling motors, lighting, bilge pumps, and onboard electronics
  • RVs: Durable power for appliances, electronics, and entertainment systems
  • Industrial Equipment: Floor scrubbers, forklifts, pallet jacks, scissor lifts
  • Solar Energy Storage: Off‑grid systems requiring robust deep‑cycle performance
  • Standby Power: Emergency lighting, UPS systems, telecom backup

Warranty Information

1 Year Warranty

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