Generac Generator Batteries

Whether you rely on a Generac Guardian series to protect your home or a GP Series portable for your job site, a reliable battery is the only thing standing between you and power during an outage. Generac engines are designed for high-performance starting, and we provide the exact-fit AGM and Lithium batteries required to keep them running.

We carry a comprehensive inventory for all Generac lines, including:

  • Home Standby Systems: Guardian, Centurion, QuietSource, and Protector series (8kW to 60kW+).
  • Portable Generators: GP7500E, XG, XP, and Ultra Source models.
  • Specialty Series: EcoGen and CorePower units.

Maintenance-Free Performance

Most of our Generac replacements feature AGM (Absorbed Glass Mat) technology. Unlike standard flooded batteries, these are spill-proof, vibration-resistant, and maintenance-free—meaning you never have to add water or worry about terminal corrosion inside your generator's enclosure.

Whether you rely on a Generac Guardian series to protect your home or a GP Series portable for your job site, a reliable battery is the only thing standing between you and power during an outage. Generac engines are designed for high-performance starting, and we provide the exact-fit AGM and Lithium batteries required to keep them running.

We carry a comprehensive inventory for all Generac lines, including:

  • Home Standby Systems: Guardian, Centurion, QuietSource, and Protector series (8kW to 60kW+).
  • Portable Generators: GP7500E, XG, XP, and Ultra Source models.
  • Specialty Series: EcoGen and CorePower units.

    • Maintenance-Free Performance

    Most of our Generac replacements feature AGM (Absorbed Glass Mat) technology. Unlike standard flooded batteries, these are spill-proof, vibration-resistant, and maintenance-free—meaning you never have to add water or worry about terminal corrosion inside your generator's enclosure.

0G9449

Centurion Series 22kW 005593-2 Standby

Centurion Series 25kW 005594-2 Standby

Centurion Series 27kW 005595-2 Standby

Centurion Series 30kW 005596-2 Standby

Centurion Series 36kW 005597-3 Standby

Centurion Series 45kW 005598-3 Standby

Centurion Series 48kW 005599-2 Standby

Centurion Series 60kW 005603-3 Standby

Centurion Series 60kW 005609-3 Standby

Centurion Series 7kW 005888-0 Standby

Centurion Series 8kW 006251-0 Standby

Centurion Series 13kW 006254-0 Standby

Centurion Series 13kW 006255-0 Standby

Centurion Series 16kW 006256-0 Standby

Centurion Series 16kW 006257-0-0 Standby

Centurion Series 20kW 006258-0 Standby

Centurion Series 11kW 006440-0 Standby

Centurion Series 11kW 006441-0 Standby

CorePower 7KW 005837-0 Home Standby

EcoGen Series 6kW 005818-1 Standby

GP Series GP7000E Portable

GP Series GP7500E Portable / 5943-0

GP Series GP7500E Portable / 5943-2

GP Series GP7500E Portable / 5943-3

GP Series GP7500E Portable / 5943-4

GP Series GP7500E Portable / 5943-5

GP Series GP7500E Portable / 5978-0

GP Series GP7500E Portable / 5978-1

GP Series GP7500E Portable / 5978-2

Guardian Series 8KW 006237-0 Home Standby

Guardian Series 14KW 006240-0 Home Standby

Guardian Series 14KW 006241-0 Home Standby

Guardian Series 17KW 006242-0 Home Standby

Guardian Series 17KW 006243-0 Home Standby

Guardian Series 20KW 006244-0 Home Standby

Guardian Series 8KW 006245-0 Home Standby

Guardian Series 14KW 006247-0 Home Standby

Guardian Series 17KW 006248-0 Home Standby

Guardian Series 17KW 006249-0 Home Standby

Guardian Series 20KW 006250-0 Home Standby

Guardian Series 11KW 006437-0 Home Standby

Guardian Series 11KW 006438-0 Home Standby

Guardian Series 11KW 006439-0 Home Standby

Guardian Series 25KW QT025 Home Standby

Guardian Series 30KW QT030 Home Standby

Guardian Series 45KW QT045 Home Standby

Guardian Series 60KW QT060 Home Standby

Guardian Ultra Source Portable 4582-2

Protector Series 15kW RD015 Standby

Protector Series 20kW RD020 Standby

Protector Series 30kW RD030 Standby

Protector Series 48kW RD048 Standby

Protector Series 50kW RD050 Standby

QuietSource Series 22KW QT022 Home Standby

QuietSource Series 27KW QT027 Home Standby

QuietSource Series 36KW QT036 Home Standby

QuietSource Series 48KW QT048 Home Standby

Series 7550EXL

XG Series XG10000E Portable / 5802-2

XG Series XG7000E Portable / 5798-2

XG Series XG7000E Portable / 5845-2

XG Series XG8000E Portable / 5747-3

XP Series XP8000E Portable / 5931-1

XP Series XP8000E Portable / 5935-0

XP Series XP6500E Portable / 5930-1

XP Series XP6500E Portable / 5934-0
Odyssey ODS-AGM42LA Extreme Battery (PC1200T)
Item #: PC1200T  |    

Odyssey ODS-AGM42LA Extreme Battery (PC1200T)

Odyssey ODS-AGM42LA Extreme Battery (PC1200T)

Item #: PC1200T
 
Voltage: 12 Volt / 42 Ah / 540 CCA
• AGM
• Dimensions: 7.80" / 6.50" / 6.70"
• Weight: 39.40 lbs
• Warranty: 2 Year (Warranty Info)
MSRP: $360.99
Price:
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Odyssey ODS-AGM42A Extreme Powersports Battery (PC1200LT)
Item #: PC1200LT  |    

Odyssey ODS-AGM42A Extreme Powersports Battery (PC1200LT)

Made in USA MADE IN USA

Odyssey ODS-AGM42A Extreme Powersports Battery (PC1200LT)

Item #: PC1200LT
 
Voltage: 12 Volt / 42 Ah / 540 CCA
• AGM
• Dimensions: 7.87" / 6.66" / 6.80"
• Weight: 39.00 lbs
• Warranty: 2 Year (Warranty Info)
MSRP: $371.99
Price:
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12V 9Ah Rechargeable SLA Battery with B1 Connector – Replaces 6-FM-9A, HW-9-12, and More
Item #: SLA-12V10-HI  |    

12V 9Ah Rechargeable SLA Battery with B1 Connector – Replaces 6-FM-9A, HW-9-12, and More

Backordered: Estimated Available June 12th, 2026

12V 9Ah Rechargeable SLA Battery with B1 Connector – Replaces 6-FM-9A, HW-9-12, and More

Item #: SLA-12V10-HI   |  Backordered: Estimated Available June 12th, 2026
 
Voltage: 12 Volt / 9 Ah / 120 CCA
• Sealed Lead Acid
• Dimensions: 5.95" / 2.56" / 3.70"
• Weight: 5.90 lbs
• Warranty: 1 Year
• See All Compatible Models
Reg. Price: $24.95
Volume Price: $21.21 See Volume Price Details
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Marathon 9A24F Group 24F AGM Battery
Item #: SLA-9A24F  |    

Marathon 9A24F Group 24F AGM Battery

Special Order: Ships in 1 Week

Marathon 9A24F Group 24F AGM Battery

Item #: SLA-9A24F   |  Special Order: Ships in 1 Week
 
Voltage: 12 Volt / 65 Ah / 710 CCA
• AGM
• Dimensions: 10.75" / 6.75" / 9"
• Weight: 44.50 lbs
• Warranty: 30 Month
Price:
$259.95
Price: $259.95
QTY:
Odyssey Extreme ODX-AGM24F Group 24F Battery
Item #: ODX-AGM24F  |    

Odyssey Extreme ODX-AGM24F Group 24F Battery

Odyssey Extreme ODX-AGM24F Group 24F Battery

Item #: ODX-AGM24F
 
Voltage: 12 Volt / 76 Ah / 840 CCA
• AGM
• Dimensions: 10.90" / 6.80" / 8.20"
• Weight: 60.00 lbs
• Warranty: 2-4 Year (Warranty Info)
MSRP: $448.99
Price:
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Antigravity Group 24 / 24F Lithium Car Battery (40Ah, 1500 CA) with RE-START
Item #: AG-24-40-RS  |    

Antigravity Group 24 / 24F Lithium Car Battery (40Ah, 1500 CA) with RE-START

Antigravity Group 24 / 24F Lithium Car Battery (40Ah, 1500 CA) with RE-START

Item #: AG-24-40-RS
 
Voltage: 12.8 Volt / 40 Ah / 1500 CCA
• LiFePO4
• Dimensions: 10.25" / 6.85" / 8.75"
• Weight: 16.60 lbs
• Warranty: 5 Year Factory Direct - Warranty Info (PDF)
• See All Compatible Models
Price:
$949.99
Price: $949.99
QTY:
Odyssey ODX-AGM27F Extreme Battery (ELT-AGM27F)
Item #: ODX-AGM27F  |    

Odyssey ODX-AGM27F Extreme Battery (ELT-AGM27F)

Made in USA MADE IN USA

Odyssey ODX-AGM27F Extreme Battery (ELT-AGM27F)

Item #: ODX-AGM27F
 
Voltage: 12 Volt / 85 Ah / 850 CCA
• AGM
• Dimensions: 12.5" / 6.80" / 8.20"
• Weight: 59.70 lbs
• Warranty: 2-4 Year (Warranty Info)
MSRP: $519.99
Price:
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Antigravity Group 27 / 27F Lithium Car Battery (40Ah)
Item #: AG-27-40-RS  |    

Antigravity Group 27 / 27F Lithium Car Battery (40Ah)

Antigravity Group 27 / 27F Lithium Car Battery (40Ah)

Item #: AG-27-40-RS
 
Voltage: 12.8 Volt / 40 Ah / 1500 CCA
• LiFePO4
• Dimensions: 12" / 6.85" / 8.75"
• Weight: 16.60 lbs
• Warranty: 5 Year Factory Direct - Warranty Info (PDF)
Price:
$949.99
Price: $949.99
QTY:
12 Volt 10 Ah Sealed Lead Acid Rechargeable Battery - F2 Terminals
Item #: SLA-12V10-F2  |    

12 Volt 10 Ah Sealed Lead Acid Rechargeable Battery - F2 Terminals

12 Volt 10 Ah Sealed Lead Acid Rechargeable Battery - F2 Terminals

Item #: SLA-12V10-F2
 
Voltage: 12 Volt / 10 Ah
• Sealed Lead Acid
• Dimensions: 5.95" / 2.56" / 4.37"
• Weight: 7.65 lbs
• Warranty: 1 Year
Reg. Price: $31.95
Volume Price: $27.16 See Volume Price Details
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12 Volt 18 Ah Sealed Lead Acid Rechargeable Battery with Nut & Bolt Terminals
Item #: SLA-12V18  |    

12 Volt 18 Ah Sealed Lead Acid Rechargeable Battery with Nut & Bolt Terminals

12 Volt 18 Ah Sealed Lead Acid Rechargeable Battery with Nut & Bolt Terminals

Item #: SLA-12V18
 
Voltage: 12 Volt / 18 Ah / 200 CCA
• Sealed Lead Acid
• Dimensions: 7.13" / 3.01" / 6.59"
• Weight: 13.50 lbs
• Warranty: 1 Year
• See All Compatible Models
Reg. Price: $41.95
Volume Price: $35.66 See Volume Price Details
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12 Volt 22 Ah Sealed Lead Acid Rechargeable Battery
Item #: SLA-12V22  |    

12 Volt 22 Ah Sealed Lead Acid Rechargeable Battery

12 Volt 22 Ah Sealed Lead Acid Rechargeable Battery

Item #: SLA-12V22
 
Voltage: 12 Volt / 22 Ah / 220 CCA
• Sealed Lead Acid
• Dimensions: 7.1" / 2.9" / 6.5"
• Weight: 17.00 lbs
• Warranty: 1 Year
• See All Compatible Models
Reg. Price: $72.95
Volume Price: $65.65 See Volume Price Details
QTY:
12V 35Ah Sealed Lead Acid Battery (Group U1)
Item #: SLA-12V35  |    

12V 35Ah Sealed Lead Acid Battery (Group U1)

12V 35Ah Sealed Lead Acid Battery (Group U1)

Item #: SLA-12V35
 
Voltage: 12 Volt / 35 Ah / 350 CCA
• AGM
• Dimensions: 7 3/4" / 5 1/8" / 6 3/8"
• Weight: 24.20 lbs
• Warranty: 1 Year
• See All Compatible Models
Price:
$114.95
Price: $114.95
QTY:

FAQ - Choosing the Right Battery for Your Generac

Which battery does my Generac GP7500E portable generator use?

The GP7500E (including models 5943 and 5978) typically uses a 12V 9Ah or 10Ah Sealed Lead Acid (SLA) battery with F2 or B1 terminals. For heavy-duty use or longer life, many owners upgrade to the 12V 10Ah version for extra cranking capacity.

What is the standard battery for a Generac Guardian Standby Generator?

Most modern air-cooled Generac Guardian units (10kW–26kW) require a BCI Group 26 or Group 24F battery. Older units or larger liquid-cooled Protector series generators may require a Group 27F. Always check your manual for the required Cold Cranking Amps (CCA), usually ranging from 525 to 700 CCA.

Can I use a Lithium (LiFePO4) battery in my Generac?

Yes, we offer premium lithium upgrades like Dakota Lithium and Antigravity (with Re-Start technology). Lithium batteries offer significantly longer lifespans and faster recharging, which is ideal for EcoGen units or generators used in off-grid solar applications.

Why does my Generac battery keep dying?

Standby generators have an internal battery charger that runs 24/7. Over time, this constant charging can "dry out" a standard battery. To maximize life, we recommend replacing your standby battery every 3 years. For portable models, always use a 12V Float Charger during the off-season to prevent the battery from discharging.

I have a Generac 0G9449 part number; what is the replacement?

The 0G9449 is a common Generac factory part number for the 12V 9Ah battery used in many portable units. Our 12V 9Ah SLA with B1/F1 connectors is the direct-fit replacement for this specific part.