Choosing a marine battery often comes down to how you use your boat: do you need raw cranking power to start an engine, or do you need a deep-cycle battery that can feed a trolling motor, fish finder, and cabin loads hour after hour? The four listings here cover both sides of that split. You have two absorbent glass mat (AGM) options from Interstate Batteries and ACDelco, plus two lithium iron phosphate (LiFePO4) options from DC HOUSE and KEPWORTH. Listed prices range from $99.98 to $259.95, so the decision also has a budget dimension.
Quick Take
If you need a Group 31 with strong cranking and reserve capacity, the ACDelco M31AGM brings 925 CCA and 200 RC. If you want a true dual-purpose AGM in a Group 24 size, the Interstate Batteries 12V 70Ah is that listing. If long deep-cycle life matters more, the DC HOUSE LiFePO4 adds Bluetooth monitoring, while the KEPWORTH LiFePO4 carries the lowest listed price.
Listed-Price Comparison
| Product | Listed Price | Listed Price Bar |
|---|---|---|
| Interstate Batteries Marine/RV Group Size 24 Dual Purpose AGM Battery 12V 70Ah | USD 259.95 | |
| DC HOUSE 12V 100Ah Lithium Battery 4000+ Deep Cycle LiFePO4 BMS RV Solar Marine Off-Grid | USD 193.75 | |
| ACDelco M31AGM Marine AGM; BCI Group 31; CCA 925; RC 200 Minutes; Length X Width | USD 159.09 | |
| KEPWORTH 100AH 300AH LiFePO4 12V Lithium Battery BMS Solar RV 15000 Deep Cycles RV Marine | USD 99.98 |
How to Choose: Decision Matrix
| If you need... | Fit from these listings | Why it fits |
|---|---|---|
| Engine cranking with a Group 31 battery and strong reserve | ACDelco M31AGM | Listed CCA 925 and RC 200 minutes |
| A single AGM for starting and house loads in a Group 24 size | Interstate Batteries 24M | Dual-purpose with 750 CCA, 940 MCA, 70 Ah |
| Long deep-cycle service plus battery monitoring | DC HOUSE 12V 100Ah LiFePO4 | Title lists 4000+ deep cycles and Bluetooth 5.1 |
| A lower-priced deep-cycle lithium for solar/RV/high-drain | KEPWORTH 100Ah/300Ah LiFePO4 | Lowest listed price with BMS and title's 15000 deep cycles |
Product Notes
Interstate Batteries Marine/RV Group Size 24 Dual Purpose AGM Battery 12V 70Ah
Need one battery that can both crank a motor and run your trolling motor when the engine is off? This AGM listing is built around that dual-purpose job. The spec sheet includes 70 Ah, 750 cold cranking amps, 940 marine cranking amps, and a 140-minute reserve capacity. It also carries a 24-month free replacement warranty in the listing's description. At the top of this price range, it is the most expensive pick here. The trade-off is that 70 Ah is less energy storage than the 100Ah lithium options, and the group size is a 24M, not a larger group 31.
12V 100Ah Lithium Battery 4000+ Deep Cycle LiFePO4 BMS RV Solar Marine Off-Grid
This 12V 100Ah LiFePO4 battery from DC HOUSE is for someone who prioritizes cycle life and wants visibility into the pack's state of charge. The title cites more than 4000 deep cycles, and the description adds a built-in Bluetooth 5.1 connection so you can monitor voltage, current, and SOC through the DC HOUSE app. It also includes low-temperature protection that blocks charging below freezing and automatically recovers when the temperature rises. On the downside, it is a deep-cycle battery rather than a cranking battery, so it should be paired with a separate starter battery for engine starting. It is listed higher than the other LiFePO4 battery in this set.
ACDELCO M31AGM Marine AGM; BCI Group 31; CCA 925; RC 200 Minutes; Length X Width
This AGM listing from ACDelco is aimed at marine applications that need high cranking capacity and a long reserve. The title gives you 925 cold cranking amps and a 200-minute reserve capacity in a BCI Group 31 case. The description also mentions dual marine terminals for easy accessory hookups and anti-vibration features that help protect the plates. The attributes note Universal Fitment: No, so you'll want to make sure a Group 31 case fits your battery compartment before committing. It sits between the two lithium listings on listed price, giving you a mid-range AGM option with strong cranking in this lineup.
100AH 300AH LiFePO4 12V Lithium Battery BMS Solar RV 15000 Deep Cycles RV Marine
For a deep-cycle budget path, the KEPWORTH LiFePO4 listing stands out with the lowest listed price in this group. The title includes 100Ah to 300Ah capacity flexibility and states 15000 deep cycles, with a built-in BMS protecting the pack. The description says the battery offers 100 percent usable capacity and is oriented toward high-drain devices and alternative-energy setups like solar and RV use. The trade-off is that this listing is not presented as a cranking battery, so it is best for house loads, trolling motors, and solar storage rather than replacing a starter battery. Keep that high-drain use case in mind as you plan your setup.
Final Recommendation by Use Case
- Need one battery for starting and house loads? The Interstate Batteries Group 24 AGM gives you a dual-purpose AGM with 750 CCA and 940 MCA.
- Need the strongest crank in a Group 31? The ACDelco M31AGM shows the highest CCA figure in this lineup at 925 CCA, plus 200 minutes of reserve.
- Want long deep-cycle life and Bluetooth monitoring? The DC HOUSE LiFePO4 fits with its 12V 100Ah pack, BMS, and Bluetooth 5.1 connection.
- Want the lowest listed price for a BMS-protected lithium house bank? The KEPWORTH LiFePO4 listing is the one to weigh for solar, RV, or high-drain use.
