U1 Battery

Duralast U1-1 Group U1 Lawn & Garden Battery. Price Not Available. Free In-Store or Curbside Pick Up. Interstate U1 Lawn & Garden Battery Costco Item Number: 850283 U1 Group Size Not Available for Purchase Online May Be Available at Your Local Costco Warehouse Item 100476413. Interstate U1 Lawn & Garden Battery. Online Price MzIuOTk= $ Your Price-$ Features: Costco Item Number: 850283. See full list on homedepot.com. ★ Generated $10M in sales at Devon Co. By recognizing the need for a 12V LiFePO4 U1 battery for the medical-cart market, commencing the development of the battery, and successfully launching it. Battery posts, terminals, and related accessories contain lead and lead components, chemicals known to the State of California Prop 65 to cause cancer and reproductive harm. Batteries also contain other chemicals known to the State of California Prop 65 to cause cancer. Wash hands after handling.www.P65Warnings.ca.gov.

Group U1 batteries are among the most popular BCI group sizes. These specialized batteries are generally used in lawnmowers, golf carts, small marine engines, mobility scooters, and other machines that are powered by mini engines. They are smaller than regular car batteries, typically measuring around 8.3 inches (L) x 5.1 inches (W) x 7.25 inches (H).

Group U1 batteries have cold-cranking amps that range between 200 and 430CCA, reserve capacity between 30 and 50 minutes, and charge capacity between 31 and 42Ah. They are also available as start/stop (thin plate) or deep cycles (thick plate) batteries.

U1 battery size


Best Group U1 Batteries: Our Top 5 Picks

The market abounds with Group U1 batteries by several different brands. And it can be overwhelming as you try compare and decide which option to go for.

In this post, we have put together a list of the best group U1 batteries — carefully selected by our research team based on performance, technology, cold-cranking amps (CCA), durability, brand trust, and buyer reviews.

Now, let’s cut right to the chase!

1. Vmaxtanks V35-857

The Vmaxtanks V35-857 is one of the well-made deep cycle batteries in its category. It is perfect for applications like sport kayaks and small boats, and it weighs only 25 pounds, which is light enough not to be a burden when you need to transport it.

A notable selling point of the V35-857 is that it is compact, measuring 7.7 x 5 x 6.1 inches. That means you can comfortably store several of them in your battery bank so you can easily reach them whenever you need to.

Design-wise, the V35-857 uses an Absorbed Glass Mat (AGM), making it completely spill-proof to eliminate worries about flammable fumes leaking or contaminants. As a result, this battery has been approved for mobile, maritime, and air travel. In effect, you won’t need any maintenance operation like checking the acidity of the electrolyte or adding water.

The battery’s grid structure features plates are made from custom military-grade alloys and duty tin, allowing it to provide an extra margin of performance and service life in either float or cyclic applications. You can expose it to vibrations without damaging its cells or experiencing a sharp decline in performance.

It also comes with safety release valves with automatic reseal feature to prevent the accumulation of harmful gases while the ultra-strong ABS containers protect the tightly packed plates, delivering the V35-857 in a 100 percent maintenance-free package. The manufacturer claims that this battery is weather-proof, so you should have no problem operating it even in the harshest weather conditions.

Coming to its performance, the V35-857 comes with cold-cranking amps (CCA) of 300, so you can crank your starter motor at 300A for thirty seconds before the voltage falls below 10.5V. With a rating of 35Ah, this battery can run for up to 75 minutes on reserve capacity and you can expect to get 4-6 hours service from it on a single charge. According to Vmax, you can run this battery down before you charge them, a feat you can’t attempt on its rivals in this segment.

Its major drawback is that you cannot charge it except you purchase a specific charger as using a generic charger will damage the battery quickly. However, the manufacturer includes a benefit placate its customers: it can withstand frequent charging and discharging to deliver a long life span.

Overall, the V35-857 is a preferred choice for many as it comes with a maximum power density as well as impressive deep cycle capabilities.


  • Lightweight
  • Charges faster
  • Compact and portable
  • Long life span
  • Can be charged with as little as 3A


  • Costs more than a regular battery
  • It requires a special charger to charge properly

2. Mighty Max Battery ML35-12

The Mighty Max Battery ML35-12 is a reliable deep-cycle battery that is of premium quality and it comes at an excellent price. With a measurement of 7.68 x 5.16 x 7.13 inches, this battery is small and portable but don’t let that fool you: the ML35-12 has sufficient power capacity for various tools and devices.

Weighing just 23 lbs, this battery isn’t heavy as it weighs only a fourth of batteries in its group and its loop handle makes it easy to move around. It uses absorbed glass mat (AGM), meaning the electrolytes are spread over the absorbent fiberglass to prevent leakage.

Extra advantages of the AGM design in the ML35-12 are that there’s little need for maintenance and that the battery can work well in unfavorable conditions. Because this battery is a sealed lead-acid (SLA) – which is also referred to as valve-regulated design – there’s minimal risk of overheating since the gases can safely escape.

In terms of its construction, the ML35-12 features a heavy-duty calcium-alloy grid, making it possible for it to withstand vibration and shocks. Also, the battery is less prone to corrosion due to its durable housing, and you can also be sure that this battery won’t disappoint you due to temperature variation at any time. You can even mount it in any position you like; this won’t affect its work.

Going further, the ML35-12 comes with thicker plates that allow for deeper discharge than other batteries without fears about running out of power too soon. When stored, the battery has a slower discharge rate than regular batteries when not used.

It is ideal for a wide range of applications including boat motors, solar, cranking battery, golf carts, electric vehicles, etc.

Unlike some conventional batteries, this battery is compatible with other chargers but just be sure not to charge it with too strong currents to prevent damage. Also, the battery charges really fast and you can charge it fully in no time. However, keep in mind that the package doesn’t come with wire harness or other mounting accessories.

Like all products made by Mighty Max, this product comes with a 1-year warranty so you don’t have to be afraid to give this battery a try. In all, if you’re looking for a top performer that can survive multiple discharges, this battery is worthy of your consideration.

U1 Battery Napa

U1 Battery


  • Great performance in all temperatures
  • Valve regulated design
  • Gets recharged in quick time
  • Lightweight
  • Pocket-friendly


  • Not suitable for large applications
  • Doesn’t hold charge for too long
  • Doesn’t include any hardware for mounting

3. Universal Power Group UB12320

If you’re looking for an excellent replacement U1 batteries pack, the UB12320 is an excellent option you should check out. This 12V 35Ah battery from Universal Power Group is a user-friendly model that comes with a number of features and is suitable for use as a backup battery, mobility scooter battery, and a host of other applications.

It is a sealed Gel battery, meaning silica gel was added to its construction, turning the acid into a solid mass that makes the battery spill-proof. Because of this feature, you can transport the UB12320 via air or ground without hazardous material restrictions. Thankfully, the battery comes with handles to aid transportation and safe placing. Even more, you can install this battery in an upright position or on its sides and use it for long without checking or adding water to it.

And should you decide not to use this battery for some time, you have no reason to fret as you can store the battery for up to 9 months at 25C (77F) but then you will need to charge it afresh when you’re ready to maintain optimum performance. If you’re storing it in a space with a high temperature, then the time interval will be shorter.

Keep in mind that this is a sealed Gel battery, which is quite different from sealed AGM batteries. They have different charger profiles, so you can only use Gel chargers for this 12V 35Ah battery because chargers designed for AGM batteries will overcharge it and this might lead to damage. Also, new gel batteries require a break-in period of about 2-3 weeks before they start functioning at full capacity, so be sure to use and recharge it until the period elapses.

The manufacturer claims the UB12320 can last 3-5 years and they back-up the battery with a 1-year warranty.


  • Sealed gel design
  • Valve regulated and spill-proof
  • Maintenance-free


  • Quality isn’t the same as AGM batteries
  • A little heavy

4. Universal Power Group UB12350

The UB12350 is another incredible sealed lead-acid (SLA) U1 battery from the Universal Power Group that can serve a wide variety of purposes including watercraft, backup systems, security, emergency lighting, solar, engine starters, golf carts and more. Basically, they can be used for an assortment of engine employable machines as they’re multi-reason by design.

It combines absorbent glass mat (AGM) and gel technology, involving microfibers separators, which acts as sponges by completely absorbing and trapping electrolytes. This design makes it possible for the battery to be operated in any position as well as in any environment, including in close proximity to people and sensitive equipment. The reason is that the UB12350 doesn’t release hazardous fumes since the gases are processed from within.

The UB12350 is valve-regulated, which is sometimes simply called “sealed”, so there’s no need to add water during the life of the battery as the content cannot be spilled. Its solid construction also makes the battery sturdy enough to resist vibrations and shocks. And you don’t have to worry about cleaning the terminals every now and then as this battery is corrosion-resistant. In spite of its build quality, the battery is not only compact but also lightweight, weighing 23.2 lbs.

In the area of its capabilities, this battery has a cold cranking amps (CCA) rating of 315 and you can always recharge it after use. Although it has a low discharge rate of 3 percent per month, it is recommended to charge the UB12350 every four to six weeks to keep the cells topped up and active, especially the colder months.

Thankfully, it doesn’t work with a specific charger, which means you can make do with just about any charger. Compared to traditional flooded batteries, the UB12350 has a longer lifespan and a better performance than some options on the market.

The battery comes with a 1-year warranty for issues that can be traced to defects from the side of the manufacturer in terms of material or workmanship. Overall, the UB12350 offers outstanding performance in delivering reliable power for critical applications at a fair price. It is easy to install, holds charge for long, and boasts a long lifespan.


  • Lightweight
  • Excellent price
  • Completely leak-proof and spill-proof
  • Holds charge well


  • These are replacement batteries alone, so you have to use your existing wires and cables

5. Chrome Battery 12V 35AH

The Chrome 12V 35AH is heavy-duty construction, deep cycle, sealed lead-acid battery. It is specially designed to serve a multipurpose fit and can be used for a wide range of applications like lawn tractors, mobile scooters, household alarm systems, etc. Being a heavy-duty battery means it can supply high amounts of power while being stable.

This battery is the workhorse of all the batteries as it is constructed with lead calcium alloy and absorbed glass mat technology, which allows for maintenance-free operation. It uses fiberglass mat separators and high cell compression that extends the battery life by delivering superior vibration resistance even in the most extreme conditions. Another advantage of its design is that it can be mounted in any position.

You also get some other impressive features when you purchase the Chrome 12V 35AH, such as the patented sealed post prevents corrosion, which gives extended battery life. Then there’s the tough and durable ABS plastic case that enables the battery to withstand abuse, vibrations, and shocks and serve you for as long as possible. It is spill-proof and leak-proof.

With the Chrome 12V 35AH, you get as much as 20 hours of power to carry out your projects and you don’t even need to get it charged when you get the delivery as it comes fully charged so you can install it straight out of the box. Being a rechargeable battery, you can charge it multiple times.

Going further, this Chrome battery boasts a cold cranking amps (CCA) rating of 180 for the first 5 seconds so you can use it to crank 12V 35AH engines after which it drops to a steady 35 amps, which is one of the most powerful, highest amp per hour capacity that you can find on the market. It also promises an impressive performance for a long time; just make sure you don’t overcharge it as this can negatively affect it.

You can expect this battery to serve you for at least 3 years without hassles and to demonstrate their confidence in their product, the manufacturer offers a 60-day no questions asked money-back guarantee along with an 18-month warranty. Long story short; this battery is one that you can count on as it delivers great performance at a very affordable price.


  • Has versatile applications
  • AGM technology
  • Supplied with full charge
  • Tough exterior
  • High amps


  • Heavy
  • Slow charging

Related Stuff

Only a few things can be more disappointing than being unable to start your lawn mower when you’re fully ready to do some lawn trimming. When that happens, the battery is the usual culprit.

But many times, it’s not because your battery is dead. It’s because the battery isn’t just strong enough to get the engine to start. And that’s why you shouldn’t skimp on cold-cranking amps (CCA) when buying a battery for your lawnmower.

With a low CCA battery, you’d have a hard time starting your lawn mower’s engine during the winter months. So, the only way to avoid this mess is to settle for a high-CCA lawn mower battery that can easily start your engine at any time of the year.

In this post, we’d be looking at some of the highest CCA lawn mower batteries on the market.


Highest CCA Lawn Mower Batteries: Our Top Picks

We understand how hard it is to hit local stores or visit multiple sites to check the CCA ratings of as many lawn mower batteries as possible — with the aim of settling for the highest-CCA option. So, we decided to take that burden off your shoulders.

Our research team has put together a list of the highest CCA lawn mower batteries that also offer good value for money. Here are our recommendations.

1. Mighty Max Battery U1 Battery ML-U1-CCAHR 12V 320CCA

A premium quality battery, the ML-U1-CCAHR 12V 320CCA from Mighty Max is one of the most reliable and long-lasting batteries on the market.

First of all, this product has a strong construction and is quite rugged. The casing is strong and durable and will offer a superb performance against shocks and vibrations that your lawn mower might be subjected to. It can equally withstand different temperatures, which means no matter how hot or cold the weather is, the battery will work as it should.

With a measurement of 10.71 x 9.61 x 6.06 inches and weighing just 18.74 pounds, the ML-U1-CCAHR 12V 320CCA boasts a compact size but don’t let it fool you; it can deliver a strong performance sufficient to power your lawn tractor, even during intense use.

The battery adopts an AGM design, which utilizes recombinant technology, where oxygen recombines through separators. Because of the design, the electrolytes are spread over the absorbent fiberglass, bringing about up to 20 times better resistance to vibration.

It is also a Sealed Lead Acid (SLA) battery, which means it has a valve that lets the gassers go that comes from overheating. Thus, you will have no worries regarding battery damage, overheating or ventilation.

Furthermore, this model can be mounted in any position as it is leak-proof and spill-proof. As with AGM/SLA batteries, the ML-U1-CCAHR 12V 320CCA has a characteristic of high discharge rate and deep discharge recovery rate, enabling it to recharge even after being depleted to a level at which many other batteries would be irrevocably drained.

As the name indicates, this battery boasts a Cold Cranking Amps (CCA) rating of 320 so you can be sure that you will get a strong burst of power whenever you need it. The battery also comes with a one-year warranty but you can expect it to serve you for a very long time.


  • Sturdy build
  • Uses SLA and AGM technology
  • Suitable for a wide range of operating temperature
  • High CCA


  • A premium price tag

2. Mighty Max Battery YTX20L-BS

Another maintenance-free battery that requires no addition of water during its lifespan, Mighty Max Battery YTX20L-BS is a model that is designed to fit most makes and models of lawn mowers. It is suitable for a wide range of other applications including motorcycles, personal watercraft, jet skis, and more.

Measuring 6.88 x 3.42 x 6.10 inches and weighing just 11.79 lbs.; the YTX20L-BS is the exact size of the OE battery it is intended to replace in that it has the same sides of polarity and also comes with all the hardware that is needed. It is entirely sealed and spill-proof for safety and longevity plus you won’t have to deal with an excessively heavy battery weighing you down.

Because it combines AGM and GEL batteries technology, you can expect this battery to last for a long time without any issues. Also, the presence of the advanced lead-calcium technology indicates that this battery can hold its specific gravity for three times longer than conventional models. Consequently, you can mount it in any position because it can resist shock and vibrations, and no damage will occur during use. It is also designed to handle the harsh temperatures (hot and cold) so you can use it whenever you want.

Furthermore, the YTX20L-BS has a high discharge rate but there’s no cause to worry as it always comes back to life because of its deep discharge recover feature. It is particularly designed for 12-volt equipment and it generates 18 amperes per hour with 270 cold cranking amps to boot.

Overall, the YTX20L-BS is a durable, reliable battery that provides a maintenance-free experience. It is backed by a 30-day refund policy and a full one year warranty.


  • Versatility of use
  • Operates in a wide range of temperatures
  • Long life
  • Lightweight


  • Terminals need regular scrubbing

3. Chrome Battery CB U1R-9

Chrome Battery is one of the few companies known for offering reliable rechargeable and replacement batteries at friendly prices and the CB U1R-9 is no exception. The Chrome Battery U1R-9 is versatile in that can fit into a variety of applications including lawn mower.

U1 Battery

As expected of durable and high performing battery, the acid inside the CB U1R-9 is constructed with lead calcium alloy and Absorbed Glass Mat technology, allowing for a low-maintenance and spill-proof design. The AGM enables the batteries to have a tough and rugged exterior, which extends its durability. Because of the design, you can mount the battery in a variety of positions.

Besides, the battery features fiberglass mat separators along with high cell compression that not only help prolong its shelf but also helps to deliver optimal resistance to vibration. The patented sealed post minimizes the risk of corrosion, which further helps to extend the battery life.

Sized 7.68 x 5.12 x 6.46 inches, the CB U1R-9 weighs 23.5 lbs.; making it one of the heavier lawn mower replacement batteries around. Nonetheless, it has a 12-volt 35 Amp to deliver sufficient power when you need it.

Another attraction to the CB U1R-9 is that it comes fully charged, allowing you to resume work immediately after you receive shipment. Installation is super simple – just connect your battery to the application and you’re ready to go. The polarity has a negative on the left and a positive on the right.

Another reason Chrome Battery is a favorite choice for many is that it comes with a 30-day refund window and a 1-year warranty. Overall, you can rely on the CB U1R-9 to provide excellent power and speed with long service life.


Lawn Tractor Battery U1

  • Heavy duty
  • Tough exterior
  • Value for money


  • Slow charging
  • Heavier than other models

4. Mighty Max Battery ML-U1 12V 200CCA

If you’re familiar with batteries, you probably know that Mighty Max is a household name when it comes to manufacturing reliable battery cells. What makes it great is not just the AGM technology (which is very important) but the fact that its internal construction is made of premium-quality pure virgin lead.

Just in case you didn’t know, pure virgin lead plates are made thinner to allow a greater allocation than usual into them, thus making them energy-dense for strong starting power in any type of weather. Not only that, but you can also expect a longer lifespan of powering your lawn tractor as well as improved deep cycling. It is rechargeable and requires no maintenance plus you don’t need additional resources for installation.

If durability is your main priority when it comes to choosing a battery for your lawn mower, then the ML-U1 12V 200CCA is a great choice as it has a sturdy build and sealed form that makes it spill-proof. As a result, you can mount in different positions without worrying about spills and leaks while the tough housing will withstand the use, motions, vibration, bangs, impact, and more.

Perhaps, the most amazing feature of this battery is that it weighs only 12.89 pounds, which is surprisingly small considering its specs and amp-hour capacity. Overall, it measures 7.75 x 5.11 x 6.25 inches. In terms of its capabilities, the ML-U1 12V 2features a CCA rating of 200CCA, which is sufficient to power your tools while its slow discharge rate when not use makes it a more attractive option.

The only complaint that customers have had with this battery is that some units arrive dead, but this is not an issue to worry about as Mighty Max offers a replacement policy but this model comes with a 1-year warranty.

U1 Battery Walmart



  • Can be mounted in any position
  • Features SLA/AGM design
  • Small-sized
  • Wide operating temperature range


  • Float service life could be improved

5. CB Chrome Battery YTX12-BS iGel Battery

Still searching for a high-performance battery at an unbelievable price? The Chrome Battery YTX12-BS is another excellent option to consider. This battery can be used to replace a wide range of lawnmower batteries.

With dimensions of 5.8 x 3.3 x 5.7 inches and a weight of 9.9 lbs., the CB YTX12-BS sports a compact size and comes with a LED digital display screen built into its body that reads the alternator gauge so you don’t have to worry about knowing if and when the battery is suffering low voltage.

When it comes to type, this model is an AGM battery with a positive and negative terminal. Other than that, the acid is laced with absorbed glass mat to ensure that the acid inside does not spill or leak. It is fully charged and ready to install right out of the package, with an offering of 12v and 10ah of power. Being an iGel battery, the CB YTX12-BS is infused with Gel Electrolytes that help to guarantee a completely ‘maintenance-free’ and efficient operation.

This battery is known for its high performance, which is largely due to its heavy-duty terminals as well as the welding technology used to provide resistance against heat, shock, and vibration, which allows it to take on physical abuse without getting damaged. As a result, it has an improved life cycle performance so you can rely on it to always deliver regardless of weather conditions.

One of the complaints about this battery is that installation is a little complicated, which is because the battery posts are not threaded. So you may have to attach the cable extra carefully so that the square nut it uses sits still.

In addition, the CB YTX12-BS comes with a 30-day money-back guarantee as well as a generous 18 months warranty to assure that the product is of high quality.


  • 18 months warranty
  • Very lightweight
  • LED screen for battery status
  • Can be recharged up to 2,000 times


  • Unthreaded battery posts
  • LED screen may cease to be efficient after some time

How long do lawnmower batteries last?

U1 Battery Agm

On average, lawn mower batteries last for up to 2-3 years but the way you store and take care of them also affects their longevity. With proper care and maintenance, the battery may last longer than three years.

Why does my lawn mower battery keep dying?

If your lawn mower battery keeps dying fast, the most probable cause is leaving the battery idle for too long, especially during dry seasons. Another reason could be corrosion as that means that the inside of the battery is leaking out. Sometimes, it could be that the sulfur molecules are emitted from the battery’s electrolyte solution and latch to the battery’s plates. Other culprits are bent interlock or damaged wiring.

Signs that you need a new lawn mower battery

Even with proper maintenance and charging, lawn mower batteries will eventually deplete and fail to hold further charges. They will hit the end of their lifespan and you need to know when they are giving those clues so you can invest in a new one in good time. Here are some signs to watch out for.

Slow starting

Generally, lawn mower batteries have enough power to start fast regardless of the weather conditions. If you notice that you have to try a couple of times before the battery starts, it may be a sign that the battery is losing reliability. You should have the battery tested so you can rule out all other causes of slow starting.

Quick charge loss

Another common sign that your lawn mower battery needs a replacement is when it fails to hold charge. This typically happens after a long period of usage, hinting that the internal components of the battery are beginning to wear out.

Corroded terminals

When a battery’s terminal gets corroded, it loses some material and this affects the contact between the terminals and the connectors. Corroded terminals can be caused by either poor maintenance (not cleaning the terminals properly) or due to usage. When the terminals are eaten up, you will need a new battery.

U1 Battery 300 Cca

Cracked case

Lawn Tractor Batteries

Lawn mower batteries come in a durable housing that is capable of withstanding physical abuse. But if upon inspection, you find a crack on the battery, it means there’s a good chance that there will be leakage of electrolyte in no time.

Wear and tear

U1 Battery 300 Cca

Lastly, lawn mower batteries need a replacement when the materials used for their construction have thinned out and are looking old. Rather than wait for the battery to malfunction, it’s a smart move to get a replacement to avoid headaches later.