12v Lawn Mower Battery (Replacement Guide and Recommendation)

12V batteries are considered the standard and most commonly used one in lawn mowers.  But choosing the best 12 V lawn mower battery replacement can be overwhelming.

Especially if you are not well aware of the determinants like- what voltage, CCA rating, built-up components, storage, charge, and reserve capacity are required in your ideal battery.

In today’s article, I will be providing a short and precise guideline to choose the ideal battery for your lawnmower or lawn tractor.

Now, have a quick look at my top-picked products.

1. Mighty Max Battery 12V 35AH U1 – Overall Best

Contains 12 Voltage, 35 AH, and weighed 23.15 lbs. This Sealed Lead Acid rechargeable zero maintenance battery features an Absorbent Glass Mat technology and valve-controlled design. Compatible with Lawn and Garden Tools, Golf Carts, and many more.

2. Weize 12V 35AH Battery – The Runner-up

This 23.1 lbs Sealed Lead Acid rechargeable and maintenance-free battery comes with Absorbent Glass Mat (AGM) technology with valve-controlled construction. Spill-proof and has Intense vibration resistance, High Cranking Amps, and Low Self-Discharge Rate.

3. Universal Power Group 12V 35AH Battery – Best For Heavy-Duty Tractors

A 22.50 lbs sealed lead-acid (SLA) rechargeable maintenance-free battery with premium quality absorbed glass mat (AGM) technology, valve controlled, and spill-proof construction design. Also, perfectly compatible with motorcycles, ATVs, UPS systems, alarm systems, and other similar types of vehicles.

4. ExpertPower 12 Volt 20 Ah – Best Affordable Battery

This one is Sealed Lead Acid maintenance-free Threaded Battery with Absorbed Glass Mat Technology and constructed with the ABS Plastic Impact Resistant Case to ensure strong resistance to protect against vibration, shock, heat, and chemical.

5. Deep Cycle SLA 12V 35AH – Best Replacement Battey

22.90 lbs weighted SLA maintenance-free, rechargeable Deep Cycle Mobility battery from the Interstate brand and designed with VRLA Technology to prevent spilling and over-pressurization. Most commonly used and compatible for Marine or Trolling Motors, RVs, and other Power System Equipment.

How to Choose the 12v Lawn Mower Battery (The Buying Guide)

Let’s learn and understand which features or specs you need to check for choosing the right battery that suits your lawnmower requirements perfectly:


The typical lawnmower battery voltage range starts from 12 V up to 40 V, but most lawnmower batteries fall into Battery Council International or BCI standardized 12 V Group U1 format.

However, it can be different for your riding or lawnmower so, check the spec details provided in your lawnmower’s user instruction manual or contact your dealer or the lawnmower brand’s customer helpdesk to determine the correct battery voltage requirements.

Terminal Size & Position

Battery Council International has categorized the batteries into different Groups based on their size and voltage.

General mower batteries fall under Group U1, which comes in two options– U1L and U1R.

The positive (+) terminal of U1L batteries is placed at their left side, and U1R batteries have the positive terminal positioned at the right. The internal construction of U1L and U1R both batteries are identically similar.

However, to install and secure the battery connection determining the terminal position of the battery is important.

You cannot put a U1L battery where a U1R battery is required, so you have to choose the right one that will fit your lawnmower.

Also, make sure to check the terminal position of your lawnmower’s existing battery before you choose between U1L and U1R batteries.

Cold Cranking Amps Or CCA Rating

Cold-cranking Amps rating represents a battery’s ability to generate power to start the engine within 30 seconds time in cold temperatures like 0°F and without dropping below 7.2 Voltage.

Remember, higher CCA ratings will be able to deliver more power even under critically lower temperatures. When the battery contains a visibly lower CCA rating, it will fail to generate enough power even during standard cold temperatures.

Typically, lawn mower battery CCA rating starts from 300A up to 400A. But you should choose at least a 320A CCA rating to get a decent performance from your battery.

But here is another fact that you should also know, a higher CCA rating means expensive battery, and lower means you can get a less expensive option.

However, if you live in a region that has a mostly warmer climate then a decent CCA rating will be perfect for you.

Battery Capacity, Compartment Compatibility, & Construction Materials

Most people skip this, but it is essential facts to check before selecting the battery unless you want to experience overheating issues on your tractor’s battery compartment.

This overheating occurs either because of the smaller battery than the compartment or lack of airflow in the compartment. So, make sure the size of your battery exactly fits with the existing battery compartment space and leaves enough space for the airflows.

Battery capacity means how much charge amount that battery can store and the capacity of a mower battery starts from 2.5AH up to 35AH.

To determine the accurate capacity range, you need to check your tractor’s user instruction.

You also need to check how sturdy and durable your chosen battery is or what types of materials were used to build it.

SLA or Sealed Lead Acid batteries are the most recommended because they are built with lead and lead dioxide as their active materials. Also, are constructed with sulfuric acid that creates better energy.  That’s why these batteries have a higher level of purity.

Best 12v Lawn Mower Battery: My Honest Review

Before making your final decision let’s have a brief look at my top five lawnmower battery recommendations and each individual product’s detailed review analysis.

Comparison table:

ProductsMighty Max Battery 12V 35AH U1Weize 12V 35AH BatteryUniversal Power Group 12V 35AH BatteryExpertPower 12 Volt 20 AHDeep Cycle SLA 12V 35AH
Item Weight23.15 lbs23.1 Lbs22.50 Lbs12.13 Lbs22.90 lbs
Voltage‎12 Volts12 Volts12 Volts12 Volts12 Volts
Unit Count1 Count1 CountN/AN/A1 Count
Cell CompositionSLA, AGMSealed Lead AcidSealed Lead AcidLead AcidSealed Lead Acid
Product Dimension7.76 in x 5.12 in x 7.01 in7.68 in x 5.12 in x 7.09 in7.75 in x 5.19 in x 7.13 in7.12 x 3.03 x 6.57 in7.68 in(L) x 5.16 in(W) x 6.42 in(H)
Reusable or RechargeableYesYesYesYesYes
Warranty1 Year1 year1 year1 Year1 year

1. Mighty Max Battery 12V 35AH U1 – Overall Best

Specs and Key Features:

  • Voltage: 12V
  • Weight: 23.15 lbs
  • Dimension: 7.76 in x 5.12 in x 7.01 inches
  • Amperage: 35 AH
  • Chemistry: SLA, AGM
Mighty Max Battery 12V 35AH U1 – Overall Best

Mighty Max ML35-12 U1 battery is the exceptional option to replace 33Ah, 34Ah, 36Ah. It can deliver outstanding performance and service life in float as well as cyclic applications.

This battery comes fully charged, and you can recharge it later on. Also, it is a maintenance-free battery so, it will save you time and money.

The ML35-12 battery also contains glass plates that keep the internal electrolyte safe even when you assemble the battery in different positions. Even the installation process of this battery is also hassle-free, and you can mount it in any position.

Tip: Do not try to assemble the battery upside-down.

Mighty max ML35-12 offers a high level of resistance back up to handle any kind of vibration or shock that occurs from the intense and extensive operation.

Also, has high discharge rate, broad operating temperatures, and deep discharge recovery, which allows any empty battery to recharge more easily than other available 12V batteries and ensures longer service life.

The Good

The ML35-12 battery is perfectly compatible for various types of electric vehicles or equipment and gardening tools. It can deliver consistent dependable performance even in any Critical Weather Conditions. The installation is straightforward, offers long shelf life, and available at a reasonable price.

The Bad

The main product packaging does not include a wire harness or mounting accessories. Also, you have to charge uninterrupted 24 up to 48 hours before each use. Otherwise, it will not last for too long.

However, you can also opt for another best alternative Mighty Max Battery ML12-12V

2. Weize 12V 35AH Battery – Another Best Pick

Specs and Key Features:

  • Voltage: 12V
  • Weight: 23.1 Lbs
  • Dimension: 7.68 in x 5.12 in x 7.09 in
  • Amperage: 35 AH
  • Chemistry: F3
Weize 12V 35AH Battery

Weize 12V 35AH Battery is specially built with a heavy-duty calcium-alloy grid to deliver exceptional performance in both float and cyclic applications.

It also contains advanced quality AGM technology, and besides screws, no extra wire harness or mounting is required for the installation. It is a Rechargeable battery so; you can easily recharge it whenever needed.

It offers a 70 up to75 mileage and also ensures long backup so you will not have to recharge it frequently.

Since the battery contains premium quality AGM technology with a valve-regulated design, it is highly protected against leaking issues.

Weize 12V 35 AH battery also contains shock or vibration resistant properties so you do not have to worry when suddenly the battery runs down to a lower level because the shock-resistant feature will not let the battery get damaged.

The Good

Weize 12V 35AH Deep Cycle Battery is versatile, requires no maintenance, and is easy to install. Also, provides longer power backup than many other similar grade batteries and even does not take too long while recharging.

The Bad

The required wire harness or mounting screws are not provided with the main packaging so, which is a little bit disappointing.

3. Universal Power Group 12V 35AH Battery – Best for Heavy-Duty Tractors

Specs and Key Features:

  • Voltage: 12V
  • Weight: 22.50 lbs
  • Dimension: 7.75 inches x 5.19 inches x 7.13 inches
  • Amperage: 35 AH
  • Chemistry: Sealed Lead Acid
Universal Power Group 12V 35AH Battery

UPG 12V 35Ah SLA no-maintenance rechargeable battery has a higher CCA of 315A and comes in fully charged condition.

It contains the premium quality Absorbent Glass Mat technology, valve-controlled design, and spill-proof construction to deliver stable performance in even aggressive conditions.

The Universal Power Group 12V UB12350 battery features several safety features and also comes with a higher power storage capacity and has no charge-loss effect even when you connect it with non-compatible equipment.

Reportedly, it mostly suits heavy-duty mowers or tractors and is especially best suitable for John Deere lawn garden tractors or mowers. But it is also compatible with other brand’s heavy-duty mower or tractor models.

Tip: This model will not fit with some of the John Deere riding lawn mowers and tractors models so, check your lawn equipment’s user manual to confirm it.

The outer casing of this UPG battery model is guarded with premium quality ABS plastic material, which ensures that it has a better capacity of absorbing shock, vibration, and even can resist chemical attacks.

The Good

UPG 12V 35AH Battery has the standard voltage, size, power storage capacity, and sturdy leakage-proof construction. Contains user-friendly handle and features all required safety features. Compatible with most of the riding, zero-turn mowers or tractors.

The Bad

The only issue that user mostly complain about is, the battery requires to charge fully before each use. Otherwise, it does not run or last for a long period as expected.

4. ExpertPower 12 Volt 20 Ah – Best Affordable Battery

Specs and Key Features:

  • Voltage: 12V
  • Weight: 12.13 Lbs
  • Dimension: 7.12 x 3.03 x 6.57 in
  • Amperage: ‎20 Amps
  • Chemistry: SLA
ExpertPower 12 Volt 20 Ah

This particular lawn mower battery from ExpertPower carries 12 volts, 20 Amp, premium quality materials and utilizes the premium AGM technology with a valve-regulated construction.

Besides the built-up and performance quality of ExpertPower 12Volt 20Ah battery, it is the most affordable battery option than other similar graded products.

This battery contains a B1 terminal, which means no extra insertion force is required, and enhances the durability of the battery. It also features spill proof properties, so it is perfect for outdoor use.

ExpertPower 12Volt 20Ah also features an ABS Impact Resistant Case and offers strong resistance and protection against vibration, shock, heat, and chemicals or acids.

The AGM technology, high-quality components, and rugged construction of this ExpertPower battery model ensure no leaking or shock resistance occurrence.

It also requires no maintenance, is rechargeable, and over time, it does not lose its charging capacity. These features eventually increase the battery shelf life.  Also, the installation process is super easy.

The Good

ExpertPower 12Volt 20Ah battery features all quality components and safety properties to deliver high-quality performance. Once you charge it fully, it can last for a maximum of 20 hours without any interruption. Also, require zero maintenance and hassle-free installation.

The Bad

Though this battery lasts for a quality period, you will have to charge regularly for daily use, and it takes 24 hours to fully charged, which seems to be disappointing to some users.

5. Deep Cycle SLA 12V 35AH – Best Replacement Battery

Specs and Key Features:

  • Voltage: 12V
  • Weight: ‎22.90 lbs
  • Dimension: 7.68 inches (L) x 5.16 inches (W) x 6.42 inches
  • Amperage: 35 AH
  • Chemistry: Sealed Lead Acid
Deep Cycle SLA 12V 35AH

Interstate 12V 35Ah Deep-Cycle battery contains an absorbed glass mat and VRLA technology, which protects from spilling and also allows multiple mounting options so you can mount it according to your preference.

This battery also features thicker internal lead plates, which provide strong resistance to handle recharges and discharges temp.

It is one of the best Replacement batteries and compatible with many different brands riding lawn mowers or lawn tractors like Kubota mowers.

This Interstate deep cycle battery features AGM and VRLA technology, which ensures the highest level of protection against spill, shock, vibration and overpressure.

The battery comes fully charged, rechargeable, and the charge does not drain out that easily unless you are operating the equipment aggressively.  So, you can recharge it whenever needed.

Interstate Deep Cycle SLA 12V 35AH battery comes in a lightweight and compact format. Also, it contains a carriable handle, which makes it perfect for carrying on outdoor jobs.

The Good

Interstate Deep Cycle SLA 12V 35AH battery contains AGM and VRLA technology to provide the highest resistance against leakage, shock, or overpressure. This rechargeable zero maintenance battery features removable handles to carry and a flexible mounting option.

The Bad

Some users have complained that the carry strap provided with the main product is not sturdy enough. Also, the product specification and usage details are not properly explained.

How To Charge 12v Lawn Mower Battery

Let’s learn how to charge your lawnmower battery by following five quick and easy steps-

First, wear protective clothing, including gloves, eye protectors, or safety glasses. Then, disconnect the battery charger from the electrical outlet.

Now find out your lawnmower or tractor’s battery location. It mostly stays either under the hood or seat, as I have mentioned earlier too.

After that, connect the positive (red) charging cable to your battery positive (red) terminal cable. Similarly, connect the negative (black) charging cable with the negative (black) terminal cable.

Next, you need to match the voltage levels of your tractor or mower and the battery charger. So, toggle the voltage setting of the charger to match the mower voltage.

Now, connect the battery charger to the compatible electric outlet and wait until your battery gets fully charged.

Tip: Choose a battery charger with a minimum of 10 Amps and also remember, lower Amps means battery will take longer time get 100% recharged.

Frequently Asked Questions (FAQs)

How Often Should I Charge My Lawn Mower Battery?

The general rule is to charge the new battery for eight to ten hours after the first use.
Later on, you can charge your lawnmower battery just before storing the tractor or mower.

How Long Do 12v Lawn Mower Batteries Last?

It will depend on your battery quality, capacity, and how aggressively you ride the lawnmower.
But typically, you can expect a decent quality battery to last for around four years.
You can easily find out the minimum lifespan of your battery by checking its specification details mostly labeled on the battery body or its main package.

Can You Recharge A Dead Lawn Mower Battery?

Yes, you can recover your almost dead battery by recharging it properly, and it will work for at least a couple of hours.
But if that does not work, you should check the connectors, charging and terminal connections whether all are connected accordingly or not.

How Long Does It Take To Charge A 12-Volt Battery?

A regular decent quality 12 V battery can take up to twelve to twenty-four hours to be completely charged.
It may take more or less time than that depending on the battery quality and charger’s capacity.

What Amp Should I Charge My Lawn Mower Battery?

The standard is setting the lawnmower battery charger into 12 voltages and 10 amps for fast charging speed.

Final Opinion

Purchasing a replacement battery for your lawn mower or tractor is part of the machine’s maintenance practices.

That’s why you need to be well informed about the requirements, which determine the compatibility and performance quality of lawn mower battery. Hopefully, my buying guide will help you to understand them.

Though each product mentioned are built with high-quality materials to deliver exceptional performance, my best two recommendation will be Mighty Max Battery 12V 35AH U1 and Weize 12V 35AH Battery.

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