how to restore the lawn mower battery

How to Restore the lawn mower battery (Complete Guide)

The problem of batteries is very common and repeated in the lawn mower. The battery of the mower goes dead or it is not working properly and very annoying for the operator when the machine is not working due to battery problems. In today’s article, I will discuss how to restore the lawn mower battery of your lawn mower at home and if is there any solution for a dead lawn mower battery.


The battery is the most important part of the lawnmower. Without it, your mower will not start or even work properly, and you will face difficulty mowing. To keep your mower running, it is essential to understand the different types of batteries used in mowers.

Lithium Batteries

Lithium-Ion (Li-Ion) Batteries are the newest type of battery on the market. Li-Ion batteries are more durable, higher energy density than other ordinary batteries. These batteries are capable of powering any mower. These batteries are compact in size and lightweight. These batteries are maintenance-free and, mostly, when defective, are not repairable.

Lead Acid Batteries

The lead acid battery is the most popular and commonly used type. Most mower manufacturers use these batteries because these batteries are relatively inexpensive and easy to maintain; even repairing these batteries is possible. Therefore, these batteries are a popular choice for many homeowners and gardening professionals


The second type of mower battery is the Nickel-Cadmium (Ni-Cd) battery. These batteries are more durable than lead-acid batteries. Ni-Cd batteries are mainly used with giant lawn mowers and are expensive to buy.

These are the batteries that are used in lawnmowers. If you want to buy a new battery, it is essential to check the compatibility of the battery with your mower so that it provides accurate power to your mower. Different mowers require different types of batteries.


Due to competition in the market, almost all the top brands make their best product in very reasonable prices, when you are going to buy a new battery for your lawnmower you have a lot of options available in the market. The best-selling-top-brand batteries are:

  • Ultra power Flooded battery
  • Ultra Power Deep cycle battery
  • Ultra Power Deep cycle AGM battery
  • Ultra power Plus battery
  • Expert Power EXP 12180 Lead Acid Battery
  • Weize 55AH Deep Cycle Battery
  • Universal Power Group UB12350 Battery
  • Antigravity ATX12-HD Heavy Duty Lithium Battery

Steps to Restore a Lawn Mower Battery

There are a few steps that may restore your weak battery. If your battery goes dead then it’s very difficult to recover and in a few cases, the battery gets exploded owing to high temperature. However, a weak battery can be restored by simply following a few easy steps. These steps are:

Note: Use of Personal Protective Equipment (PPEs):
Before starting work always wear Personal protective equipment like safety goggles, and safety gloves.

Removing of Battery:

The first step is to remove the battery from the lawn mower. While removing the battery note down the positive and negative polarities on the wire. If the indication for positive and negative is not right in the battery you might connect the battery in opposite polarity and it’s very dangerous. Note down the battery’s polarities before removing the battery.

Empty the battery:

The second step is to empty the battery from the old solution, clear all its plates and drain all the solution so that you start working on the restoration.

Cleaning of battery:

The third step is to clean the battery from the inside, for this purpose you may use baking soda with the distilled water. The baking soda will remove the sulfate and corrosion from battery plates. Mix the baking soda with distilled water and fill the battery with that solution. After two, or three hours clear the cleaning solution and drain all the solution from the battery. Also, rinse the battery with distilled water after clearing of solution (baking soda and distilled water)

Refilling of Battery:

Now refill the battery with the distilled water to the recommended level mentioned in the battery. If you have magnesium sulfate then you make a solution using magnesium sulfate with the distilled water.

Note: if you refill the battery with only distilled water there is no issue so don’t be confused about the magnesium sulfate

Charging of Battery:

Lastly, you can charge your battery as recommended by the manufacturer (Not more than 08 hours). After completion of charging you can wait for the cooling of battery plates. After cooling, install the battery into the mower and start using it.

Why Your Lawn Mower Battery Won’t Hold a Charge

There are several reasons behind the multifunctioning of the lawnmower battery. These reasons vary from case to case basis. However, a few major reasons for the failure of the lawn mower battery is as follows:

Low-quality battery:

The first and foremost reason behind the battery failure is the quality of the battery. Users buy less expensive and cheap lawn mowers which come up with low-quality batteries. Therefore, to avoid any hurdles, always buy a quality product so that you cannot face difficulty while working.

Expiry of shelf life:

Another important reason behind the battery failure is the expiry of battery life. Normally, users never do maintenance of the battery and use it continuously for years so battery life expires. Always check the battery after two-three months.


Corrosion is also an important reason behind battery failure. The corrosion accumulation near the terminals and the cell opening due to which battery is not fully charged. Slowey and gradually the battery stopped working. It is very important to clean the battery terminals and also unplug the terminals wire from the battery and clean it carefully.

Decrease in the level of Solution:

Sometimes the level of distilled water/ solution decreases in the battery and its stops working. So always check the distilled water/solution level frequently to avoid any hurdle during the work.

Natural Sulfate Buildup:

When the battery discharges, sulfates can stick to the plates inside. Over time, these sulfates can crystallize and build up, which limits the battery’s ability to undergo necessary chemical reactions. Regular reconditioning can help prevent this buildup.


You can easily check the voltages of the battery by using a MULTIMETER/ AVO meter. In your meter move the knob to the DC voltages symbol. Now touch the red lead to the positive terminal of the battery and black lead to the negative terminal. Check the voltages in the display.

The solution of the battery is easily available on the market. You can find it at a hardware store in your area or go to the authorized dealer of your battery manufacturer. You also order online from your home.

Completely dead battery cannot be restored at home. However, you can go to the battery repairing shop. The technician can check it and if he found it useful then he changes the plates of your battery so that your battery start working.


In a nutshell, it is very clear that by following these steps your battery starts working and the life of your battery also extends. It is worth mentioning that be careful while working with the battery because it might be exploded if not connect the charger correctly or if both of the positive and negative terminals connect it might explode and also damage your face or other body parts. In the last, in case your battery is not working after doing these steps then you don’t try to install it on the mower and handed over the battery to the battery repairing shop for your safety. In case of any confusion, you may contact us so that a technical expert answer your query.

Naveed Aanjum author

About Naveed A Hashmi

In my childhood, I used to see my parents while working in the land, for these reasons today I have been serving the same as our own tradition and culture. I thus love to stay in it, because I want to learn something advanced and new so that I may improve my farm’s contour and help others with my experience.

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