Best Group 31 Battery for Marine, RV, and Starting Use

#1 · Best Overall

1. Interstate Marine/RV AGM

• Voltage: 12 V
• Weight: 60 lb

Best for: Boat power and deep-cycle use.

Why it ranks #1: This 12V Group 31 AGM combines 100Ah capacity with 925 CCA and is explicitly designed for marine/RV starting and sustained accessory power.

Its 2-in-1 pure-lead AGM design pairs high-cranking power with extended deep-cycle discharge, so one battery can start a boat and help run accessories such as a trolling motor, audio system, or fish finder. The 12V, 100Ah Group 31 format makes it a marine-focused option for buyers balancing starting and onboard power needs.

Thick plates support continuous discharge, connecting the battery’s deep-cycle role to sustained power for a boat’s motor accessories and electronics. Its 925 CCA specification also addresses engine-starting demand, while 100Ah capacity gives buyers a defined capacity for planning onboard loads. At 60 pounds, it is a substantial battery to handle during installation, so account for that weight when positioning it. The listed compatible vehicle type is boat, making its stated application marine rather than a general-purpose car fit.

Skip it if you need a lightweight battery to move frequently; the listed weight is 60 pounds, while LiTime 12V 100Ah Group 31 weighs 22.1 pounds.

For boat owners who need starting power alongside sustained energy for accessories, this Interstate combines both roles in a 12V, 100Ah AGM package. Consider its 60-pound weight and marine-specific listed compatibility when planning installation.

Listed on Amazon as: Interstate Batteries Marine/RV Battery 12V 100Ah 925CCA 1110CA Group 31 AGM (31-AGM5)

#2 · Best Dual-Purpose

2. WEIZE Group 31M AGM

• Voltage: 12 V
• Dimensions: 6.81"D x 12.99"W x 8.35"H
• Weight: 67.5 lb

Best for: Marine and RV AGM versatility.

Why it ranks #2: Its 110Ah, 825 CCA and 240-minute reserve capacity support both engine starting and deep cycling; it is specified for marine and RV use.

The WEIZE BCI Group 31M combines 110Ah capacity with dual-purpose starting and deep-cycle operation, letting marine and RV users draw on one battery for engine starts and accessory demands. Its sealed AGM construction and specified terminal orientation add practical details for installation and ongoing use.

AGM technology is described as providing shock and vibration resistance, a useful attribute for the movement and vibration associated with boats and RVs. The dual-purpose format handles starting and deep-cycle demands in one unit, while 110Ah gives a concrete capacity for planning accessories. The listed dimensions are 12.99 by 6.81 by 8.35 inches, and its terminals are positive-left and negative-right, helping buyers plan cable routing and battery placement.

Skip it if you need a battery specifically listed for passenger-car use; the Mighty Max MM-G31 is identified as compatible with passenger cars.

The WEIZE suits marine and RV owners who want a sealed AGM unit for starting and accessory power, with 110Ah capacity and vibration resistance. Its left-positive terminal layout is an important installation consideration.

Listed on Amazon as: Weize BCI Group 31M Dual Purpose AGM Battery, 240RC 825CCA 12V 110AH Starter & Deep Cycle Sealed Marine & RV Battery

#3 · Highest Capacity

3. Mighty Max MM-G31M

• Voltage: 12 V
• Dimensions: 13"D x 6.81"W x 9.37"H
• Weight: 72.5 lb

Best for: Higher-capacity marine dual-purpose.

Why it ranks #3: This marine dual-purpose AGM lists 110Ah, 825 CCA, 1000 MCA, and 240 RC, making its capacity and starting figures especially useful.

With 110Ah capacity and a 240-minute reserve rating, the Mighty Max MM-G31M offers substantial stated energy for marine loads while retaining dual-purpose starting capability. Its 825 CCA and 1000 CA figures speak to engine-starting needs, making it a candidate for boat owners balancing cranking and accessory power.

The 110Ah deep-cycle capacity is intended to keep electronics and gear running, while the dual-purpose design also supplies starting power. Its 825 CCA and 1000 CA ratings give buyers separate cranking figures to consider for engine starts. The 240-minute reserve capacity provides another reference for sustained use. At 72.5 pounds and 13 by 6.81 by 9.37 inches, it calls for space and handling planning in a boat installation.

Skip it if you want a lighter listed Group 31 option for handling; the Odyssey ODX-AGM31 lists dimensions but no comparable weight, while LiTime 12V 100Ah weighs 22.1 pounds.

Boat owners who want one AGM battery for engine starting and extended accessory power can use the MM-G31M’s 110Ah capacity and 240-minute reserve rating as planning anchors. Its 72.5-pound weight calls for careful installation planning.

Listed on Amazon as: Mighty Max Battery MM-G31M, 12V 110Ah, Group Size 31M Deep-Cycle Marine AGM, Dual-Purpose Starting & Deep Discharge, 825 CCA, 1000 MCA, 240 RC, Spill-Proof Maintenance-Free Battery

#4 · Longest Reserve

4. MARXON Group 31M

Best for: Marine dual-purpose with 200RC.

Why it ranks #4: Its marine/RV dual-purpose design lists 105Ah, 825 CCA, and 200-minute reserve capacity, with screws and nuts included.

The Marxon Group 31M combines 825 CCA with a 200-minute reserve capacity, linking engine-starting capability to a defined measure of sustained power. Its 105Ah rating and marine/RV compatibility make it a dual-purpose choice for buyers who want one battery to support starting and longer-running electrical loads.

The dual-purpose design addresses two different jobs: rapid cranking for an engine or generator and steady discharge for deep-cycle use. Its 825 CCA rating specifies starting output, while the 200-minute reserve capacity gives buyers a practical reference for sustained power. The 105Ah capacity adds another measure for planning loads. Dimensions are listed as 12.99 by 6.61 by 8.35 inches, with positive terminal on the left and negative on the right, useful details for installation planning.

Skip it if you need more than 105Ah in one battery; the Mighty Max MM-G31M lists 110Ah for buyers seeking higher single-battery capacity.

This Marxon is a fit for marine or RV owners who value a dual-purpose battery with 105Ah capacity and a 200-minute reserve rating. Check its listed dimensions and left-positive terminal layout before installation.

Listed on Amazon as: Group 31M Marine Battery Dual Purpose Marxon 12V 105Ah 1072MCA 825CCA

#5

5. Mighty Max MM-G31

• Voltage: 12 V
• Dimensions: 12.88"D x 6.75"W x 9.5"H
• Weight: 57.6 lb

Best for: Group 31 AGM car starting.

Why it ranks #5: This 12V Group 31 AGM car battery provides 100Ah, 900 CCA, and 140 minutes of reserve capacity for buyers prioritizing vehicle starting.

A 900 CCA rating gives the Mighty Max MM-G31 a clear focus on starting power, while its 100Ah capacity and 140-minute reserve capacity add a stated measure of stored energy. This 12V Group 31 AGM battery suits buyers seeking a rechargeable car battery with sealed, spill-proof construction.

The 900 CCA specification supports the battery’s stated fast-starting role, and the 140-minute reserve capacity provides a reference point for how long it can support power needs. Its sealed, spill-proof AGM design helps keep battery use tidier, while the listing also cites deep-discharge recovery for steady power after discharge. Dimensions of 12.88 by 6.75 by 9.5 inches and a 57.6-pound weight are useful planning details for installation and handling.

Skip it if you need a marine dual-purpose battery for sustained boat accessories; the WEIZE BCI Group 31M is specified for marine and RV use.

Choose this Mighty Max if your priority is a rechargeable Group 31 AGM car battery with 900 CCA and a stated reserve capacity. Its 57.6-pound weight and listed passenger-car compatibility matter when planning installation.

Listed on Amazon as: Mighty Max Battery MM-G31 Start and Stop Car BCI Group 31 12V 100AH, 140RC, 900 CCA, Rechargeable AGM Car battery

#6 · Highest CCA

6. Odyssey ODX-AGM31

• Voltage: 12 V
• Dimensions: 9.25"D x 15.25"W x 12.5"H
• Weight: 16 oz

Best for: High-cranking AGM performance.

Why it ranks #6: The listed product description gives 1150 CCA, the highest stated cranking figure here, and the manufacturer lists a four-year warranty.

A listed 1,150 CCA gives the Odyssey ODX-AGM31 a strong starting specification, while its stated 70% longer cycle life than conventional deep-cycle batteries targets buyers who also value repeated cycling. This 12V Extreme Series AGM model has threaded top terminals and a Group 31 identity.

The 1,150 CCA figure makes starting output a central point for shoppers comparing batteries for engine cranking. Odyssey also states 70% longer cycle life than conventional deep-cycle batteries, which may matter to buyers planning repeated charge-and-discharge use. Threaded top terminals are a specific connection detail to account for when preparing an installation. The listed dimensions are 15.25 by 9.25 by 12.5 inches, so checking available space against those measurements is particularly relevant.

Skip it if you need a compact battery around 13 inches long; the Odyssey’s listed dimensions are 15.25 by 9.25 by 12.5 inches, while LiTime 12V 100Ah measures 13 by 6.77 by 8.5 inches.

Consider the Odyssey if high listed cranking output and the stated cycle-life advantage are priorities. Its threaded top terminals and comparatively large listed dimensions make connection style and installation space key fit considerations.

Listed on Amazon as: Odyssey Battery ODX-AGM31 Extreme Series AGM Battery

#7

7. LiTime 12V 100Ah LiFePO4

• Voltage: 12 V
• Dimensions: 6.77"D x 13"W x 8.5"H
• Weight: 22.1 lb

Best for: RV and solar deep-cycle storage.

Why it ranks #7: This 100Ah Group 31 lithium battery weighs 22.1 pounds and has a five-year warranty; its listing specifically says it is not for engine starting.

The LiTime Group 31 LiFePO4 battery is explicitly intended for RV, marine, trolling-motor, trailer, home-energy, and solar-storage use, with 100Ah capacity in a 22.1-pound package. That combination gives storage-focused buyers a defined capacity and listed dimensions to consider when arranging a compact installation.

Its 100Ah capacity offers a clear planning figure for RV, marine, or solar storage, while the 22.1-pound weight is a handling detail compared with heavier battery options. The listed dimensions—13 by 6.77 by 8.5 inches—help with space planning in an installation. Crucially, the product is not for starting engines, golf carts, or jacks-type applications, so its stated role is deep-cycle storage rather than engine cranking.

Skip it if you need engine-starting capability; the WEIZE BCI Group 31M is a dual-purpose marine battery specified for starting and deep-cycle use.

Choose the LiTime for listed RV, marine, trolling-motor, or solar deep-cycle storage where 100Ah and its 22.1-pound weight fit the plan. Do not select it for engine starting or the other excluded applications.

Listed on Amazon as: LiTime 12V 100Ah Group 31 LiFePO4 Deep Cycle Battery for RV Marine Solar

#8

8. Power Queen 12V 100Ah

• Voltage: 12.8 V
• Weight: 10 kg

Best for: RV and solar lithium storage.

Why it ranks #8: This 12.8V 100Ah LiFePO4 battery is listed for RV solar use and includes terminal bolts and insulating caps; its specifications give a five-year warranty.

Grade A LiFePO4 cells are the stated foundation of the Power Queen 12V 100Ah Group 31 battery, positioning it for RV and solar use. Its 12.8V rating, 10-kilogram weight, and supplied M8 terminal bolts give buyers practical details for evaluating storage capacity and installation.

The listed Grade A LiFePO4 cells identify the battery’s chemistry and cell description, while 100Ah at 12.8V provides the main capacity and voltage figures for planning an RV or solar setup. Its 10-kilogram weight helps estimate handling during placement. The package includes insulating caps and M8 terminal bolts, which specify connection hardware supplied. Bluetooth is explicitly unavailable, a relevant boundary for buyers who want battery monitoring through a wireless connection.

Skip it if you require Bluetooth access to battery information; this model explicitly has no Bluetooth, while LiTime offers a Bluetooth LiFePO4 battery line.

This Power Queen suits RV and solar-storage buyers who want a 12V, 100Ah LiFePO4 battery with supplied terminal hardware. Its lack of Bluetooth makes it a poor fit for users requiring wireless monitoring.

Listed on Amazon as: power queen 12V 100Ah LiFePO4 Battery Group 31 Lithium Battery for RV Solar

#9

9. VEMDIA 12V 100Ah LiFePO4

• Voltage: 12.8 V
• Dimensions: 12.9"D x 6.6"W x 8.5"H

Best for: Protected lithium deep-cycle capacity.

Why it ranks #9: Its 100Ah lithium specification and listed over-current, overcharge, over-discharge, short-circuit, and high-temperature protections suit deep-cycle power needs.

The VEMDIA LiFePO4 battery pairs 100Ah capacity with listed protection against over-current, overcharge, over-discharge, short circuit, and high temperature. Its 12.8V rating and Group 31 deep-cycle positioning give RV, trolling-motor, and other listed application buyers concrete electrical details for planning.

The five stated protection functions address specific electrical and temperature conditions, giving buyers useful information when evaluating a lithium battery for a planned setup. Its 100Ah capacity and 12.8V rating provide core figures for load and system planning. The listed dimensions are 12.9 by 6.6 by 8.5 inches, while included M8 terminal bolts and insulating caps identify connection accessories supplied. Listed uses span RV, solar storage, marine, fish finders, and trolling motors.

Skip it if you need Bluetooth monitoring; the Power Queen EF-114A14N-0D explicitly lists no Bluetooth availability, so consider a different model with that capability.

The VEMDIA fits buyers seeking a 100Ah lithium deep-cycle battery with multiple listed protections and supplied terminal hardware. Its capacity is a boundary for larger loads, so plan the required energy before choosing it.

Listed on Amazon as: 12V 100Ah LiFePO4 Lithium Battery Group 31 Deep Cycle for RV Trolling Motor

#10

10. yeagulch 100Ah LiFePO4

• Voltage: 12.8
• Weight: 10 kg

Best for: Lithium battery with 100A BMS.

Why it ranks #10: The listing identifies a 12.8V, 100Ah Group 31 LiFePO4 battery, but provides fewer dimensions and application details than other options.

A built-in 100A BMS is the defining stated feature of this 12.8V, 100Ah LiFePO4 Group 31 battery, pairing lithium storage with a specified battery-management limit. Its listed 1280Wh capacity gives RV, marine, and other deep-cycle buyers an energy figure to use when planning compatible loads.

The 100A BMS provides a concrete current rating to consider when matching the battery to equipment, while 1280Wh identifies its stated energy capacity. Its LiFePO4 chemistry and 12.8V rating distinguish the listed electrical format for buyers planning a deep-cycle setup. The available specifications do not provide dimensions or terminal orientation, so installation planning should rely on those details only when separately verified. The 100A limit is the key operating boundary indicated in the supplied product information.

Skip it if you need more than 100A of stated BMS current; the VEMDIA LiFePO4-100A lists protective functions but no 100A BMS rating in its supplied specifications.

This yeagulch suits buyers planning a 12.8V lithium deep-cycle setup who can work within its stated 100A BMS rating. Its 100Ah and 1280Wh figures help assess capacity, but installation dimensions are not supplied here.

Listed on Amazon as: 12V 100Ah LiFePO4 Lithium Battery BIC Group 31 with 100A BMS 1280Wh