Quick answer
Most riding mowers and lawn tractors use a 12V Group U1 battery. Our top pick is the UPLUS U1 360CCA AGM: sealed and maintenance-free, with strong cranking and a 15-month warranty. The Mighty Max ML-U1-CCAHR is the best value, and the Odyssey PC310 is the premium choice. Before you buy, match the terminal polarity (positive on the left or the right) to your old battery.
A mower battery only has to crank the engine and run the lights and electric PTO clutch, so it doesn’t need much capacity. What matters most is the right size, the right terminal layout, enough cold cranking amps (CCA) and a design that tolerates vibration and long winter storage.
| 1 |  | UPLUS U1 360CCA AGMBest Overall | Check price |
| 2 |  | Mighty Max ML-U1-CCAHRBest Value | Check price |
| 3 |  | MARXON U1 330CCABest for Commercial Mowers | Check price |
| 4 |  | Odyssey PC310Best Premium AGM | Check price |
| 5 |  | TYKOOL 20Ah U1 LithiumBest Lithium Battery | Check price |
| 6 |  | U1-R32 16Ah 720CCA LithiumBest for Hard Starting | Check price |
The best lawn mower batteries
1UPLUS U1 360CCA AGMBest Overall
A sealed AGM U1 battery rated 360 CCA and 26Ah, built from pure primary lead. It’s maintenance-free and vibration-resistant, and UPLUS rates it to start at -22°F.
- Type: AGM sealed lead-acid
- CCA / Ah: 360 / 26Ah
- Size: 7.68 × 4.92 × 6.93″
- Warranty: 15 months
Best For: Most riding mowers and lawn tractors.
Pros:
- High CCA for a U1
- No maintenance
- Good cold starting
Cons:
- Check polarity before ordering
- Heavier than lithium
2Mighty Max ML-U1-CCAHRBest Value
A 320 CCA sealed AGM U1 battery at a lower price. It mounts in any position and resists shock and vibration. The terminals are positive on the left. For mowers with the positive on the right, choose the ML-U1R-CCAHR.
- Type: AGM SLA, high-rate
- CCA: 320
- Size: 7.75 × 5.11 × 6.25″
- Polarity: positive left
Best For: Budget replacements on standard tractors.
Pros:
- Low price
- Both polarities available
- Spill-proof
Cons:
- No wiring or mounts included
- Shorter warranty than premium brands
3MARXON U1 330CCABest for Commercial Mowers
A 330 CCA sealed AGM U1 with a long compatibility list that includes Exmark, Ferris, Gravely, Hustler and Kawasaki-powered machines. It has a 15-month warranty and US-based support.
- Type: AGM sealed lead-acid
- CCA: 330
- Size: 7.68 × 4.92 × 6.14″
- Warranty: 15 months
Best For: Zero-turns and commercial-brand mowers.
Pros:
- Wide brand fit
- Heat-resistant case
- Maintenance-free
Cons:
- Shorter than some U1s, so check your hold-down
4Odyssey PC310Best Premium AGM
Odyssey’s compact pure-lead AGM battery is rated for up to 400 cycles at 80% depth of discharge. It’s built for heavy vibration and long service life.
- Type: pure-lead AGM
- Cycle life: up to 400 cycles at 80% DoD
- Terminals: threaded brass, M4 bolts
Best For: Owners who want the longest-lasting lead battery.
Pros:
- Very durable
- Long life
- Holds charge in storage
Cons:
- Expensive
- Smaller than U1, so confirm fit
5TYKOOL 20Ah U1 LithiumBest Lithium Battery
A LiFePO4 U1 battery with a 600A CCA rating, a built-in BMS and an LCD state-of-charge display. It’s rated for 3,000+ cycles and is much lighter than lead-acid.
- Type: LiFePO4 with smart BMS
- CCA / Ah: 600A / 20Ah
- Size: 7.6 × 4.8 × 6.9″
- Polarity: positive left
Best For: Owners who want a lightweight, long-life upgrade.
Pros:
- Lightweight
- Charge display
- Low self-discharge
Cons:
- Costs about twice as much
- Check your charging system suits lithium
6U1-R32 16Ah 720CCA LithiumBest for Hard Starting
A 12.8V 16Ah LiFePO4 battery rated at 720A max CCA. It weighs about 5 lb and has a BMS protecting against over- and under-charging, plus a 2-year warranty.
- Type: LiFePO4 with BMS
- Max CCA: 720A
- Weight: about 5 lb
- Warranty: 2 years
Best For: Big V-twins that crank slowly.
Pros:
- High cranking surge
- Very light
- 2-year warranty
Cons:
- Pricey
- Lithium can struggle in very cold starts
How to choose a lawn mower battery
Group size
Most riders take a U1. Measure your old battery or check the manual. Push mowers with electric start use small 12V packs.
Polarity
U1 batteries come with the positive on the left or on the right (U1R). The wrong one may leave cables too short to reach.
CCA
200–300 CCA is plenty for most single-cylinder engines. Choose 300+ for V-twins and cold-climate starts.
AGM or lithium
AGM is cheaper and works with any mower charging system. Lithium is lighter and lasts longer but costs more. Confirm your mower’s charging system is suitable before switching.
Frequently asked questions
How long does a lawn mower battery last?
Usually 3–5 years. Keeping it charged over winter with a maintainer is the biggest thing you can do to make it last longer.
Can I use a car battery in my riding mower?
Generally no. A car battery is too big for the tray and hold-down, and the extra weight and size aren’t needed.
Why does my new battery keep dying?
Check the charging system. A bad regulator, a stator problem or a key-on drain will flatten any battery. With the engine at full throttle, you should see about 13–14.5V at the battery.
Related: Craftsman riding mower battery · Lithium-ion mower batteries
How we chose: This is a researched guide. We compared battery type, CCA, capacity, size, polarity and warranty from current manufacturer listings. We didn’t field-test these batteries.
Update log: November 2026: rebuilt the guide. We narrowed the list to six current U1 batteries (AGM and lithium), added polarity guidance, a buying guide and an FAQ.