Lawn mower battery prices range from $40 to $300 depending on the mower type and battery chemistry

A basic lead-acid battery for a riding mower costs $40 to $100. Lithium-ion batteries for cordless push mowers run $80 to $300. The price depends on three things: whether your mower is riding or push, whether the battery is lead-acid or lithium-ion, and the amp-hour rating (how long it runs before needing a charge).

If you own a riding mower with a 12-volt engine, you are almost certainly using a lead-acid battery — the same type in a car. These are cheap and reliable but need water checks and can freeze in winter. If you own a cordless push mower, the battery is lithium-ion, which costs more upfront but lasts longer and requires no maintenance.

The single biggest cost driver is amp-hour capacity. A 2.0 Ah battery (runs about 20 minutes) costs less than a 5.0 Ah battery (runs about 45 minutes). Buying the exact same brand and model as your mower uses will cost less than a third-party replacement, and buying a used battery can cut the price in half — but used batteries lose capacity over time.

Key Takeaways

  • Lead-acid batteries for riding mowers cost $40 to $100 and are sold at hardware stores, auto parts retailers, and online.
  • Lithium-ion batteries for cordless push mowers cost $80 to $300 and are usually sold only by the mower manufacturer.
  • Amp-hour rating determines runtime: a 2.0 Ah battery runs roughly 20 minutes, while a 5.0 Ah battery runs roughly 45 minutes.
  • The battery that came with your mower is usually the cheapest option; third-party batteries cost 10 to 40 percent less but may not fit or perform identically.

Lead-acid batteries for riding mowers: $40 to $100

A riding mower battery is a 12-volt lead-acid battery, identical in chemistry to a car battery but smaller. Most riding mower batteries weigh 30 to 50 pounds and measure roughly 7 inches wide by 5 inches tall. You can buy them at Tractor Supply, Home Depot, Lowe's, NAPA Auto Parts, or Amazon.

The cheapest option is a store-brand battery from a hardware chain — expect to pay $40 to $60. A name-brand battery (Odyssey, Optima, Interstate) costs $60 to $100. The difference is warranty length and reserve capacity (how long it holds a charge when the mower is not running). A store brand typically carries a one-year warranty; a premium brand carries three to five years.

Do not assume all 12-volt batteries fit your mower. Check your owner's manual for the exact battery group size — common sizes are U1, 24, 24F, and 31. A battery that is the wrong size will not fit in the battery box or may not connect to the terminals. When you buy a replacement, match the group size exactly.

Lithium-ion batteries for cordless push mowers: $80 to $300

Cordless push mowers use rechargeable lithium-ion batteries, the same type in power drills. These batteries are sold by the mower brand — DeWalt, Ryobi, Ego, Greenworks, and others each use their own design. You cannot mix brands; a DeWalt battery will not fit a Ryobi mower.

A single battery costs $80 to $200 depending on amp-hour capacity. A 2.0 Ah battery (the smallest) costs $80 to $120. A 5.0 Ah battery costs $150 to $200. A 7.5 Ah or 10.0 Ah battery costs $200 to $300. The higher the amp-hour rating, the longer the mower runs before you need to swap in a charged battery.

Most cordless mower owners buy two batteries so one can charge while they mow with the other. A two-battery kit (usually one smaller, one larger) costs $150 to $250 and is cheaper than buying two batteries separately. Check whether your mower came with a battery; many do, and you may only need to buy a second one.

Third-party and aftermarket batteries: 10 to 40 percent cheaper

Companies like Greenworks, EGO, and Ryobi sell batteries under their own name but also license their design to third-party makers. A third-party lithium-ion battery for a popular mower brand costs 10 to 40 percent less than the original. For example, an official Ryobi 5.0 Ah battery costs around $180, while a third-party equivalent costs $110 to $150.

The trade-off is warranty and support. A third-party battery usually carries a one-year warranty instead of three years. If it fails, you may have to contact the third-party maker rather than the mower brand. Some third-party batteries also report slightly lower runtime than the official version, though the difference is usually small (5 to 10 percent).

For lead-acid riding mower batteries, third-party options are less common because the market is dominated by a few large makers (Odyssey, Interstate, Optima). A no-name lead-acid battery is rare and usually not worth the savings.

Used and refurbished batteries: 30 to 50 percent off

Used batteries are sold on Facebook Marketplace, Craigslist, and eBay. A used lead-acid riding mower battery costs $20 to $50. A used lithium-ion cordless mower battery costs $40 to $120. The savings are real, but so are the risks.

A used lead-acid battery may have internal corrosion you cannot see, which shortens its life. A used lithium-ion battery has already lost some capacity — a battery that originally ran 45 minutes may now run 35 minutes. Neither type shows its age until you use it. If you buy used, test it before you leave the seller's location if possible, or ask for a return window.

Refurbished batteries are different from used ones. A refurbished battery has been opened, tested, and repaired by the maker or a certified shop. Refurbished lithium-ion batteries usually carry a one-year warranty and cost 20 to 30 percent less than new. Refurbished lead-acid batteries are rare because the chemistry does not support rebuilding.

Where to buy and what to check before you order

For riding mower lead-acid batteries, buy from Tractor Supply, Home Depot, Lowe's, or NAPA Auto Parts. These retailers stock common sizes and accept returns if the battery does not fit. Online retailers like Amazon and eBay are cheaper but charge shipping (lead-acid batteries are heavy and may incur hazmat fees).

For cordless mower lithium-ion batteries, buy from the mower brand's official website or authorized dealers. Home Depot and Lowe's stock batteries for popular brands like Ryobi, DeWalt, and Ego. Buying from the brand directly usually costs more but guarantees the full warranty.

Before you order, write down three things: the mower brand and model number (on a sticker under the seat or on the deck), the battery type (12V lead-acid, or the lithium-ion brand), and the amp-hour rating if it is lithium-ion. Call the retailer or check the product page to confirm the battery fits your mower. Do not assume all batteries of the same voltage are interchangeable.

Frequently Asked Questions

Can I use a car battery in my riding mower?

No. A car battery is too large and heavy for a mower battery box, and the terminals are positioned differently. A mower battery is smaller and lighter by design. Using a car battery will damage the mower's charging system and may cause a fire.

How long does a lawn mower battery last?

A lead-acid riding mower battery lasts three to five years with regular maintenance (checking water levels, keeping terminals clean). A lithium-ion cordless mower battery lasts three to five years of regular use before capacity drops noticeably. Both types degrade faster if left uncharged for months or stored in freezing temperatures.

What does amp-hour mean?

Amp-hour (Ah) measures how much charge a battery holds. A 2.0 Ah battery holds twice as much charge as a 1.0 Ah battery. For cordless mowers, a higher amp-hour rating means longer runtime — roughly 10 to 15 minutes per amp-hour, though this varies by mower model and cutting conditions.

Is it worth buying a bigger battery?

If your lawn is small (under a quarter acre), a 2.0 Ah battery is enough. If your lawn is a half acre or larger, a 5.0 Ah battery saves you from swapping batteries mid-mow. The extra cost ($50 to $100) is worth it if you mow weekly and do not want to wait for a charge between passes.

Can I use a third-party battery with my mower?

Yes, as long as it is designed for your mower brand. Check the product listing to confirm compatibility. Third-party batteries work identically to official ones but may carry a shorter warranty. Avoid batteries from unknown makers with no reviews.