How to Maintain a Lawnmower Battery – Video


If you would like to know some tips with maintaining your Lawn Mower Batteries, then make sure to check out these 3 videos outlined below.

Types of Lawnmower Batteries

Electric lawnmowers typically use two main types of batteries which are lead-acid batteries and lithium-ion batteries and both of these types are summarised briefly below.

Lead-acid Batteries

These are the older and more traditional type of battery commonly found in vehicles and lawnmowers. They consist of lead plates immersed in an electrolyte solution of sulfuric acid. Lead-acid batteries are known for their affordability and durability. They can provide a steady power output over a long period, making them suitable for larger lawns. However, they are bulkier and heavier compared to lithium-ion batteries. They also require regular maintenance, such as checking and refilling electrolyte levels, and may have a shorter lifespan.

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Lithium-ion Batteries

These batteries have gained popularity in recent years due to their high energy density, lighter weight, and longer lifespan. Lithium-ion batteries use lithium compounds as the active material and offer a higher power-to-weight ratio. They provide consistent power throughout their discharge cycle and can be recharged quickly.


Lithium-ion batteries are generally maintenance-free and do not require electrolyte monitoring. They are more expensive upfront but offer advantages such as reduced weight, longer runtime, and quicker charging times. This makes them suitable for smaller lawns and for users who prioritize convenience.

Battery Technologies

It's important to note that the specific battery used in an electric lawnmower can vary depending on the manufacturer and model. Some lawnmowers may also utilize other battery technologies, such as nickel-cadmium (NiCd) or nickel-metal hydride (NiMH), although these are less common in modern electric lawnmowers.

Power of Lawnmower Batteries

Lawnmower batteries are rated in terms of their capacity, which is typically measured in ampere-hours (Ah). The capacity of a lawnmower battery indicates the amount of charge it can store and how long it can power the lawnmower before requiring a recharge. Higher capacity batteries generally provide longer runtime, allowing you to mow larger areas without interruption.

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For example, a lawnmower battery with a capacity of 2.0Ah can deliver a current of 2 amperes for one hour before it is fully depleted. Similarly, a 3.0Ah battery can sustain a 3-ampere current for one hour, and a 4.0Ah battery can deliver 4 amperes for one hour.

Operation Length

The capacity of the battery is an important consideration when choosing a lawnmower, as it determines how long you can operate the mower before needing to recharge. A larger capacity battery will provide a longer runtime, allowing you to complete mowing tasks without having to stop and recharge frequently.

Higher Capacity Batteries

It's worth noting that the actual runtime of a lawnmower will depend on various factors, including the efficiency of the mower, the type of grass being cut, and the mowing conditions. Additionally, higher capacity batteries tend to be larger and heavier, so it's important to find a balance between capacity and the weight you're comfortable handling.


Manufacturers may offer lawnmower models with different battery capacity options, allowing users to choose the one that best suits their needs based on the size of their lawn and desired runtime. Some models may even offer compatibility with interchangeable batteries, giving users the flexibility to switch between different capacities depending on the task at hand.

Maintenance of Batteries

Maintaining the batteries in electric lawnmowers is essential to ensure their optimal performance and longevity and these are some important maintenance tips for electric lawnmower batteries that you can use at home

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Regular Charging

It is crucial to keep your lawnmower battery charged regularly, even during periods when you're not actively using the mower. Follow the manufacturer's recommendations for charging intervals. Avoid storing the battery in a fully discharged state, as this can lead to reduced capacity or even permanent damage.


Keep the battery and its terminals clean and free from debris, dirt, or grass clippings. Wipe the battery with a clean, damp cloth and ensure that the terminals are free from corrosion. Corroded terminals can hinder the flow of electricity and reduce the battery's performance. If you notice corrosion, gently clean the terminals using a mixture of baking soda and water or a battery terminal cleaner.


Periodically inspect the battery for any signs of physical damage or leakage. If you notice any cracks, bulges, or leaking electrolyte, stop using the battery immediately and consult the manufacturer or a professional for guidance. Damaged batteries should be handled with caution and replaced if necessary.


If you plan to store the lawnmower for an extended period, such as during winter months, remove the battery from the mower and store it in a cool, dry place. Ensure that the battery is charged to an appropriate level before storage. Some manufacturers recommend storing the battery at around 50% capacity to prevent self-discharge or overcharging during storage.

Temperature Considerations

Extreme temperatures can impact battery performance and lifespan. Avoid exposing the battery to excessively high or low temperatures. If you live in an area with extreme weather conditions, consider storing the battery indoors or in a climate-controlled environment.

Battery Replacement

Over time, the battery's capacity may decrease, resulting in reduced runtime. If you notice a significant decline in performance or the battery no longer holds a charge, it may be time to replace it. Follow the manufacturer's recommendations for battery replacement and ensure that you use the correct type and capacity specified for your lawnmower model. Remember to consult the user manual or manufacturer's guidelines specific to your lawnmower and battery for detailed maintenance instructions and any additional recommendations they provide.

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Community Feedback

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