Best Group 27 Car Battery for Cars, Trucks, and Start-Stop Systems

#1 · Best Overall

1. LIPOWER Group 27/27F

• Dimensions: 12.05"D x 8.58"W x 6.81"H
• Weight: 26 lb
• Battery Capacity: 80 amp hours
• Compatible with Vehicle Type: Passenger Car, Start-Stop System Vehicles, Truck

Best for: Start-stop truck battery upgrade.

Why it ranks #1: Explicitly fits passenger cars, trucks, and start-stop systems; lists 80Ah capacity, Group 27/27F sizing, and a five-year warranty.

Solid-state cell technology is the defining feature of this 12-volt Group 27/27F battery, offering a lithium-based alternative for passenger cars, trucks, and start-stop vehicles. Its 80Ah capacity and stated 3,000-plus deep cycles support buyers seeking extended service from a replacement battery, while the two group-size options address different terminal layouts.

The Group 27/27F fit and listed dimensions give shoppers concrete measurements to compare with a battery tray, while the supplied terminal-position guidance helps distinguish standard Group 27 from 27F before installation. That matters because factory cables have fixed lengths, so positive-terminal orientation affects connection reach. At 26 pounds, this battery is lighter than many listed marine AGM options. The manufacturer also specifies 80Ah capacity and solid-state cells; the stated 10-year lifespan and 3,000-plus cycles indicate the intended long-service use.

Skip it if you need a listed CCA figure to compare starting output; the SDULIBITIY G27-Button specifies 1,300 CCA.

Choose this LIPOWER for a Group 27 or 27F car or truck when solid-state construction and long-cycle claims are priorities. Before installing, match the positive-terminal position to your fixed factory cable layout and verify the listed dimensions against the tray.

Listed on Amazon as: Group 27/27F Car Battery, Solid State Start-Stop Battery

#2 · Highest Cranking Output

2. SDULIBITIY Group 27 Lithium

• Compatible with Vehicle Type: Passenger Car

Best for: Button-display lithium starter.

Why it ranks #2: Automotive-labeled Group 27 battery lists 1300 CCA, 80Ah, and a five-year warranty; its terminal layout is positive left, negative right.

A built-in voltage display button and emergency-start button give this Group 27 lithium battery controls for checking voltage and requesting a start boost. Its 12.8V, 80Ah LiFePO4 construction is specified at 1,300 CCA, making it a high-starting-output option for passenger-car shoppers considering lithium.

The voltage display button provides a direct way to check battery voltage, and the separate emergency-start button adds a specific control for an urgent starting situation. The listed 1,300 CCA rating supports shoppers comparing cranking output, while 80Ah capacity identifies its energy rating. The battery measures 12 by 6.8 by 8 inches and has left-positive, right-negative terminals, details that help with tray and cable planning. Charging is limited to 0–40°C, and home or unattended charging is prohibited.

Skip it if you cannot supervise charging or keep it within 0–40°C; the LIPOWER solid-state listing does not specify these charging restrictions.

This SDULIBITIY suits a car owner who values a voltage display, emergency-start control, and the stated 1,300 CCA. Its charging temperature and supervision rules are important boundaries; also check terminal orientation and tray dimensions.

Listed on Amazon as: GROUP 27 Lithium-ion Car STAR-STOP Battery, 12.8V 80Ah 1300CCA LiFePO4 Automotive Battery For Car, Voltage button with charge and emergency start button 60 Months Warranty

#3 · Best AGM Marine

3. Interstate 27M AGM

• Dimensions: 12.5"D x 6.75"W x 9"H
• Weight: 69 lb
• Battery Capacity: 85 amp hours
• Compatible with Vehicle Type: Boat, RV

Best for: Marine cranking and trolling power.

Why it ranks #3: An 85Ah AGM dual-purpose battery for boats and RVs, with 975 MCA and a 36-month free-replacement warranty; vehicle fit needs checking.

Dual-purpose AGM operation lets this Interstate battery crank a marine motor and power a trolling motor, including when the motor is off. Its 85Ah capacity and Group 27M format suit boat and RV shoppers seeking one battery for starting and onboard use, rather than a starting-only role.

The 975MCA rating identifies its marine starting output, while 85Ah capacity gives the battery a separate reserve for running equipment. That combination supports a boat workflow in which one battery can start the motor and supply a trolling motor, whether the engine is running or stopped. At 69 pounds and 12.5 by 6.75 by 9 inches, it calls for checking lifting access and tray space. The AGM construction is specified as rugged for demanding conditions.

Skip it if you need a lighter battery to handle alone; the 20.8-pound CYCLENBATT Group 27 LiFePO4 weighs much less.

This Interstate suits boaters and RV owners who want marine starting and trolling-motor power in one AGM unit. Allow for its 69-pound weight during installation, and compare its Group 27M dimensions with the available battery compartment.

Listed on Amazon as: Interstate Batteries Marine/RV Battery 12V 85Ah 975MCA Group 27M AGM

#4 · Maintenance-Free AGM

4. ACDelco Gold M27AGM

• Dimensions: 6.9"D x 12.1"W x 8.8"H
• Compatible with Vehicle Type: Trailer

Best for: Maintenance-free marine AGM.

Why it ranks #4: Maintenance-free AGM design lists deep-cycle performance and a leak-proof valve system, but its stated compatible vehicle type is trailer.

Maintenance-free AGM construction means this ACDelco Group 27 battery requires no added water and is specified as spill- and leak-free. Its deep-cycle performance and high-density plate oxide are aimed at trailer and marine buyers who need cycling capability without routine watering or terminal acid damage concerns.

The absorbed glass mat design removes water maintenance, while its leak-proof pressurized valve system is specified to help prevent dry-out and acid damage at the terminals. Those features make routine ownership simpler for a buyer who wants to avoid checking fluid levels. High-density plate oxide supports power per pound, and heavy top lead with large through-partition connections is listed for high-cycling service. Its dimensions are 12.1 by 6.9 by 8.8 inches, useful for tray checks.

Skip it if you need published amp-hours and cranking figures for comparison; the Interstate Group 27M lists 85Ah and 975MCA.

Choose this ACDelco for trailer or marine use when maintenance-free AGM construction and cycling features matter more than published capacity figures. Check the 12.1-by-6.9-by-8.8-inch dimensions against your battery compartment before installation.

Listed on Amazon as: ACDelco Gold M27AGM (88866100) 24 Month Warranty Marine AGM BCI Group 27 Battery

#5 · Dual-Purpose Marine

5. MARXON Group 27M

• Compatible with Vehicle Type: marine rv

Best for: Marine dual-purpose AGM power.

Why it ranks #5: Lists 92Ah, 800 CCA, and 175-minute reserve capacity for marine and RV use; the manufacturer describes dual-purpose starting and steady power.

The 92Ah capacity combines with 800 CCA and 175 minutes of reserve capacity in this MARXON Group 27M marine battery. Its dual-purpose role covers engine starting and steady power, a useful combination for marine and RV owners who want one battery for cranking and ongoing loads.

Its 800 CCA rating addresses engine-starting demand, while 92Ah capacity and 175-minute reserve capacity give buyers separate figures for evaluating sustained use. The listing identifies it as dual-purpose for marine and RV applications, combining those roles in one battery. Dimensions of 12.05 by 6.61 by 8.19 inches and a left-positive, right-negative layout help with tray and cable planning. Two differently sized terminals and included screws and nuts provide connection hardware for installation.

Skip it if you need positive on the right for fixed cables; the LIPOWER Group 27/27F listing identifies both terminal-layout options.

This MARXON suits marine or RV owners seeking cranking and reserve capacity in a Group 27M battery. Its left-positive layout is a key fit boundary, so compare terminal position and listed dimensions with your cables and tray.

Listed on Amazon as: Group 27M Marine Battery Dual Purpose 12V 92Ah 1040MCA 800CCA 175RC

#6

6. Mighty Max MM-G27M

• Dimensions: 12.06"D x 6.62"W x 9.25"H
• Weight: 70.5 lb
• Battery Capacity: 100 amp hours
• Compatible with Vehicle Type: Boat

Best for: High-capacity marine dual-purpose.

Why it ranks #6: Offers 100Ah, 800 CCA, and 170-minute reserve capacity as a marine dual-purpose AGM battery; its listed compatible vehicle type is boat.

A 100Ah deep-cycle rating gives this Mighty Max Group 27M battery substantial listed capacity for electronics and gear, while its dual-purpose design also supplies engine-starting power. With 800 CCA and 850 MCA, it targets boat owners who want cranking and sustained onboard use from one AGM battery.

The 100Ah capacity pairs with the stated dual-purpose role, so a boat owner can use the battery for starting and for electronics or gear between starts. Its 800 CCA and 850 MCA ratings provide separate cold and marine cranking figures for evaluating engine-starting needs. A 170-minute reserve capacity is also listed. At 70.5 pounds and 12.06 by 6.62 by 9.25 inches, installation requires accounting for both lifting weight and compartment dimensions.

Skip it if you need a battery that is easier to lift into a tight compartment; the 20.8-pound CYCLENBATT Group 27 LiFePO4 is much lighter.

Pick this Mighty Max for marine use when 100Ah capacity, starting ratings, and deep-cycle duties belong in one battery. Its 70.5-pound weight and listed dimensions are practical constraints to consider before lifting it into the boat.

Listed on Amazon as: Mighty Max Battery MM-G27M, 12V 100Ah, Group Size 27M Deep-Cycle Marine AGM, Dual-Purpose Starting & Deep Discharge, 800 CCA, 850 MCA, 170 RC, Spill-Proof Maintenance-Free Battery

#7

7. CYCLENBATT Group 27 LiFePO4

• Dimensions: 12.09"D x 6.65"W x 8.19"H
• Weight: 20.8 lb
• Battery Capacity: 100 amp hours
• Compatible with Vehicle Type: Camper, Home Energy Storage, Marine…

Best for: Cold-weather charging protection.

Why it ranks #7: A 100Ah Group 27 lithium battery with low-temperature charging protection and five-year warranty, but listed applications focus on RV, marine, and off-grid use.

Low-temperature charging protection is the defining feature of this CYCLENBATT LiFePO4 battery: its BMS cuts off charging below 32°F and resumes when charging temperature rises. The 100Ah, 12.8V Group 27 format is specified for camper, marine, RV, off-grid, and solar applications.

The Group 27 dimensions and plug-and-play replacement claim make this battery a candidate for replacing a Group 27-size SLA unit, while its 100Ah rating supplies substantial listed capacity for RV, marine, or off-grid use. Its BMS temperature protection cuts off charging below 32°F and resumes charging when temperature rises, helping govern cold-weather charging rather than leaving that condition unmanaged. At 20.8 pounds, it weighs considerably less than the listed 70.5-pound Mighty Max marine AGM option.

Skip it if you need a stated cutoff for cold-weather discharging; the listed protection here specifically covers charging below 32°F.

Choose this CYCLENBATT for Group 27-size RV, camper, marine, or off-grid installations needing 100Ah and low-temperature charging control. Its stated safeguard addresses charging, so buyers should not treat it as a listed discharge cutoff.

Listed on Amazon as: 12V 100Ah LiFePO4 Battery Group27 Size with Low-Temp Protection

#8

8. Mighty Max MM-G27M-39

• Dimensions: 12.06"D x 6.62"W x 9.25"H
• Weight: 70.5 lb
• Battery Capacity: 100 amp hours
• Compatible with Vehicle Type: Boat

Best for: Case 284 replacement application.

Why it ranks #8: The 100Ah marine battery lists 800 CCA and 170-minute reserve capacity, but its model listing specifies replacement compatibility with Case Corp. 284.

Compatibility with Case Corp. 284 models from 1978–86 distinguishes this Mighty Max Group 27 listing. It combines a 100Ah dual-purpose AGM battery with 800 CCA and 170 minutes of reserve capacity, giving buyers figures for both engine starts and sustained equipment power.

The named Case Corp. 284 compatibility makes this listing relevant to owners of those machines, while its 100Ah rating and dual-purpose description cover starting and running electronics or gear. The 800 CCA figure supplies a cold-start comparison point, and 170 minutes of reserve capacity adds a separate measure for ongoing loads. Dimensions are 12.06 by 6.62 by 9.25 inches, with a 70.5-pound listed weight; these details matter when planning a replacement installation.

Skip it if you need a listing specifically naming a Case Corp. 484; the Mighty Max MM-G27M-34 is the listed match for those models.

Choose this Mighty Max listing when replacing a battery in a Case Corp. 284 from the stated model years and seeking dual-purpose capacity. Its weight and 12.06-by-6.62-by-9.25-inch dimensions remain installation considerations.

Listed on Amazon as: Mighty Max Battery MM-G27M Group Size 27 12V, 100Ah, 170 RC, 800 CCA, Replacement Battery Compatible with Case Corp. 284 78-86

#9

9. Mighty Max MM-G27M-34

• Dimensions: 12.06"D x 6.62"W x 9.25"H
• Weight: 70.5 lb
• Battery Capacity: 100 amp hours
• Compatible with Vehicle Type: Boat

Best for: Case 484 replacement application.

Why it ranks #9: Lists 100Ah, 800 CCA, and 170-minute reserve capacity for marine use; its stated replacement compatibility is Case Corp. 484.

This Mighty Max listing specifically names Case Corp. 484 models from 1979–86, separating it from otherwise similar Group 27 options. Its 100Ah dual-purpose battery provides 800 CCA and 170 minutes of reserve capacity for buyers evaluating both starting and sustained electrical needs.

The stated Case Corp. 484 fit makes this listing relevant to owners of those machines, while its 100Ah capacity supports the battery's described dual-purpose use for starting and running equipment. An 800 CCA rating gives a concrete starting figure, and 170 minutes of reserve capacity helps buyers assess ongoing loads. The battery measures 12.06 by 6.62 by 9.25 inches and weighs 70.5 pounds, so both compartment clearance and lifting access matter during replacement.

Skip it if you need a listing naming Case Corp. 284 models; the Mighty Max MM-G27M-39 specifically lists that application.

This listing fits buyers replacing a battery in a Case Corp. 484 from the stated years who want 100Ah dual-purpose capacity. Confirm the tray dimensions and plan for the 70.5-pound lift during installation.

Listed on Amazon as: Mighty Max Battery MM-G27M Group Size 27 12V, 100Ah, 170 RC, 800 CCA, Replacement Battery Compatible with Case Corp. 484 79-86

#10

10. Mighty Max MM-G27M-338

• Dimensions: 12.06"D x 6.62"W x 9.25"H
• Weight: 70.5 lb
• Battery Capacity: 100 amp hours
• Compatible with Vehicle Type: Boat

Best for: National Oilwell E-15 application.

Why it ranks #10: This 100Ah, 800 CCA marine battery is specifically listed as a replacement for National Oilwell E-15, not as a passenger-car battery.

Compatibility with the National Oilwell E-15 from 1976–90 is the application-specific detail that sets this Mighty Max listing apart. Its Group 27, 100Ah dual-purpose battery also lists 800 CCA and 170 minutes of reserve capacity for starting and sustained electrical demands.

For a National Oilwell E-15 from the stated model years, the named compatibility makes this listing a targeted replacement candidate. Its 100Ah capacity and dual-purpose description support both starting and powering equipment, while 800 CCA gives a listed cranking benchmark. The 170-minute reserve capacity adds information for sustained loads. At 12.06 by 6.62 by 9.25 inches and 70.5 pounds, the battery requires attention to compartment space and installation handling.

Skip it if you need a listing for Case Corp. 484 models instead; the Mighty Max MM-G27M-34 names that application.

Select this Mighty Max when replacing a battery in a National Oilwell E-15 from the stated years and needing dual-purpose capacity. Check compartment dimensions and account for its 70.5-pound weight before installation.

Listed on Amazon as: Mighty Max Battery MM-G27M Group Size 27 12V, 100Ah, 170 RC, 800 CCA, Replacement Battery Compatible with National Oilwell E-15 76-90