By Erik Watkins

Kobalt 40V Max 5.0 Ah Battery Replacement For Lawn Mowers

Last updated: Apr 12, 2023
kobalt 40v battery replacement

If you own a Kobalt lawn mower, you know the importance of a reliable and long-lasting battery. However, your battery may lose its charge capacity or fail altogether after a few years of use. 

Thankfully, many replacement options can help you get your lawn mower operating once more. In this article, we’ll guide you through choosing the right Kobalt 40V 5 Ah battery replacement for your garden tool.

Understanding The Kobalt Lawn Mower Battery

Kobalt 40V Max 5.0 Ah

The Kobalt 40V lawn mower battery is a lithium-ion battery known for its lightweight and compact design. It weighs only 2.8 pounds, making it easy to handle, and it has a fuel gauge that allows you to monitor the battery’s charge level. 

The battery is also designed to work with Kobalt’s 40V Max system, which includes various outdoor power tools such as trimmers, blowers, and gas chainsaws.

One of the most significant advantages of the Kobalt 40V battery is its high-capacity rechargeable battery, which provides a longer run time compared to traditional batteries. 

It is also designed to deliver consistent power throughout its use, meaning you won’t experience a decrease in intensity as the battery drains.

As mentioned, the Kobalt 40V is lightweight, making it easy to handle and maneuver while you work. It is also compatible with a wide range of Kobalt 40V power tools, meaning you can use it to power all your devices.

Why Replace Your Kobalt 40V Battery?

One of the most common reasons for replacement is deteriorating performance. Over time, batteries tend to lose their capacity, meaning they can’t hold as much charge as they used to. 

This can result in decreased run time, which can be frustrating if you’re working on a project requiring much energy.

Another reason you may need to replace your Kobalt 40V battery is if it has been damaged, accidents happen (toxic contamination, fire, explosion, etc.).

Let’s say your battery has been dropped or exposed to extreme temperatures; it may no longer work properly. In some cases, a damaged one may even be dangerous, so replacing it as soon as possible is essential.

Signs That Your Kobalt 40 Battery Need Replacement

One of the most common signs is that your battery will no longer hold a charge. If you find that it drains quickly or won’t hold a charge, it is likely time to replace it.

Another sign is that it no longer provides sufficient power for your tools. Whenever you notice that your tools are not performing as well as they used to or are struggling to complete tasks, its battery may be to blame.

Finally, once your battery is damaged, swollen, or leaking, it is crucial to replace it immediately. A subpar product can pose a significant risk, and it is unsafe to continue using it.

How To Choose The Right Kobalt Replacement Battery

If you’re looking for a replacement for your Kobalt tools, such as hedge trimmers, string trimmers, pole saws, leaf blowers, and more, there are a few things you should consider.

Battery Type

The first thing you need to consider is the type of battery. Kobalt 40V batteries are available in two types: lithium-ion and lithium-ion polymer. 

Lithium-ion batteries are the most common type and offer a good balance of power and weight. Lithium-ion polymer batteries are lighter and more compact but may not deliver as much power as lithium-ion batteries.

When choosing a replacement option, consider the type of tool you will be using it with. A lithium-ion battery may be the better choice for devices requiring a lot of power, such as chainsaws or leaf blowers. 

For tools that call for less power, such as string trimmers, a lithium-ion polymer battery may be sufficient.


Not all batteries are compatible with all power tools, and using an incompatible product can wreak havoc on both the battery and the tool. 

Before you purchase a replacement, check the compatibility information provided by Kobalt to ensure that it will work with your specific tool.


The capacity of the battery refers to how much charge it can hold. The higher the capacity, the longer your tool will last on a single charge. 

Look for one with a capacity that’s at least as high as the original one. However, higher-capacity batteries are usually heavier and more expensive than lower-capacity ones.

If you need your tool to run for a longer period, you may want to consider a replacement battery with a higher capacity, such as the MAX 40V 2.5 Ah battery or the 6.0AH 40-Volt battery. In case you are using it for shorter periods, a lower-capacity battery may be more practical.

Brand Reputation

Brand reputation is also an important factor to consider. Choose a reputable brand that has a track record of producing high-quality batteries. This will ensure you get a reliable and long-lasting model that performs well.


Higher-capacity and higher-quality batteries are usually more expensive than lower-capacity and lower-quality batteries. But a higher price doesn’t always guarantee better performance. 

Consider your budget and choose the one that offers the best balance of performance and affordability. 

Top Kobalt 40 Volt Battery Replacement

1. CaliHutt 40V 6.0Ah

CaliHutt 40V 6.0Ah

This CaliHutt has a high capacity of 6.0Ah, which means longer runtime and more power for your tools. It also has an LED indicator that shows the remaining power level. 

It is designed with safety in mind, with overcharge protection, over-discharge protection, over-current protection, and short-circuit protection. However, it’s a bit heavier than the Kobalt 40V battery aftermarket and other replacement batteries on this list.


  • Quick charge time with superior safety
  • LED indicator available
  • High capacity of 6.0Ah


  • A bit expensive

2. Jialipok 40V 6.0Ah

Jialipok 40V 6.0Ah

Another 6.0Ah battery replacement option, the Jialipok, also has an LED indicator and is compatible with all Kobalt 40V tools. It charges quickly, taking only 1.5 to 2 hours to fully charge. 

That said, some users have reported that it doesn’t hold a charge, as well as other replacement batteries. 


  • Compatible with all Kobalt 40V tools
  • Good customer service
  • Battery status indicator


  • May not hold a charge as well as other alternatives

3. DSANKE 40V 6000mAh

DSANKE 40V 6000mAh

The 6.0AH 40-Volt Battery or the 6000mAh 40V lithium is slightly higher than the other 6.0Ah batteries on this list. It also has an LED indicator and can pair well with all Kobalt 40V tools. 

We also give our thumbs up for this model since it has a longer lifespan than some other replacement batteries. Still, it’s also heavier than some other options.


  • Higher capacity of 6000mAh
  • Long battery lifetime
  • Extra protection with ECP chip


  • Heavier than some other options

4. Ryobi 40V 6 Ah

Ryobi 40V 6 Ah

While not specifically a Kobalt replacement battery, you can use the Ryobi 40V 6 Ah in Kobalt 40V tools. It delivers a similar capacity to the other 6.0Ah batteries on this list. 

This product stands out as it’s a bit lighter than some of the other replacement batteries. However, it doesn’t have an LED indicator.


  • Capacity similar to other 6.0Ah replacements
  • Lighter weight than some other options


  • No LED indicator

5. 36V e-Bike Battery

36V e-Bike Battery

This battery is not a traditional replacement option, but it can be used for Kobalt 40V tools. It has a high capacity of 15Ah and is designed for e-bikes, which means it’s quite durable. 

Also, you can apply it to other purposes besides powering Kobalt tools. It’s quite heavy and may not be as convenient to use as some other replacement batteries, though.


  • High capacity 
  • Durable lifespan
  • Versatile battery


  • Rather heavy
  • Not easy to use

6. Greenworks 40V Lithium Battery

Greenworks 40V Lithium Battery

The Greenworks is a popular replacement option for the Kobalt 40V lawn mower. With a capacity of 4.0Ah, it is slightly higher than the original Kobalt battery. 

There is a fuel gauge available, so you can easily monitor its charge level. The Greenworks battery works well with all Greenworks 40V tools, as well as Kobalt 40V tools. Nevertheless, we found that the battery only lasted for 45 minutes, tops, and sometimes got overheated.


  • High capacity 
  • Fuel gauge include for ease of use
  • Can be used for other powering tool brands, besides Kobalt


  • Short battery life
  • Overheating (sometimes)

How To Replace Your Kobalt 40V Battery?

If you have determined that your Kobalt 40v battery needs replacement, the good news is that the process is relatively straightforward. Follow these steps to replace yours:

  • Step 1: Locate the battery release button on your Kobalt 40v power tool. Press the button to release the battery from the tool.
  • Step 2: Slide the old battery out of the tool.
  • Step 3: Align the new battery with the tool and slide it into place until you hear it click.
  • Step 4: Press the battery release button to ensure that it is securely in place. Your new one is now installed and ready to use.

When replacing your Kobalt 40V battery, it is important to follow some safety precautions to prevent accidents:

  • Turn off the mower: Always turn off the mower before replacing the battery.
  • Wear gloves: Wear gloves when handling the battery to prevent burns or other injuries.
  • Avoid water: Keep the battery and the mower away from water or moisture to prevent damage.
  • Use a compatible charger: Use the charger that came with the battery or a compatible charger to charge it. Using an incompatible charger can damage the battery or cause a fire.


How Long Does a Kobalt 40V Battery Last?

Its lifespan depends on various factors such as usage, charging habits, and storage. Generally, a Kobalt 40V battery lasts between 2-4 years.

Can I Use a Higher Capacity Battery With My Kobalt 40V Power Tool?

Yes. Using a higher-capacity battery can provide longer runtime. However, it’s crucial to ensure that the voltage of the replacement battery matches that of your original battery to avoid damaging your power tool.

Are All 40V 6 Ah Kobalt Batteries Interchangeable?

Generally, yes, all 40V 6 Ah Kobalt batteries are interchangeable. 

As long as the battery is designed to be used with Kobalt 40V tools, has the same voltage and capacity (in this case, 40V and 6 Ah), and uses the same type of connector, it should be compatible with all Kobalt 40V tools that can accept a 6 Ah battery.

Final Thoughts

Replacing your Kobalt 40V lawn mower battery is a simple process that can be done by following a few easy steps. When choosing a Kobalt lawn mower battery, it is important to consider factors such as voltage, capacity, brand, and price to ensure that you get a high-quality battery that meets your needs. 

With a new battery, your Kobalt lawn mower will run smoothly and efficiently, providing you with a beautifully manicured lawn all season long.

Automotive Mechanic at PowerAll

With 7 years experience in management positions leading automotive mechanics at PowerAll, Erik Watkins wishes to share useful knowledge and information about automotive mechanical equipment.


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