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10 Reasons a Kobalt Electric Battery Mower Won’t Start (FIXED!)

Electric mowers are quiet and require less maintenance when compared to traditional gas mowers. This doesn’t mean they don’t come without problems.

A Kobalt electric battery lawn mower won’t start when it doesn’t have sufficient battery power due to using the wrong size battery, incorrect battery installation, a dead battery, or one that will no longer hold a charge.

A Kobalt cordless mower will also not start when it has loose or pinched wires; a bad safety switch, or debris collecting under the deck.

Keep reading for additional causes of your starting problem. Always remove the battery before making any repairs to your mower.

Kobalt electric mower

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Follow all safety instructions provided in your equipment operator’s manual before diagnosing, repairing, or operating. Consult a professional if you don’t have the skills, or knowledge or are not in the condition to perform the repair safely.

Reasons Your Kobalt Electric Battery Mower Has a Starting Problem

1. Insufficient Battery Power

Your mower won’t start when it doesn’t have sufficient battery power. Check to make sure you are running the recommended battery size and capacity for your Kobalt battery mower.

Using the wrong battery may not only power the motor, but it may also damage the mower.

2. Battery is Not Correctly Installed

Next, check the battery installation to ensure the battery is securely in place.

The battery should slide into the grooves of the battery compartment. On most Kobalt mowers, you will hear a click when the latches snap into place and the battery is securely attached to the mower.

3. Battery Is Dead

It’s no surprise that a Kobalt battery-powered mower won’t start when the battery is dead. You may be able to check the level of charge on the battery for some models using an LED lighting system.

This lighting system varies by model. You may find it on the battery, on the mower’s indicator panel or you may have to place your battery on the charger to read the charging status.

You can tell your battery is going bad when you fully charge the battery and it is no longer holding a charge as long as it once did.

Losing the ability to hold a charge is a sign the battery is dying. Another sign your battery is going bad is when it becomes very hot.

You need to buy a replacement Kobalt battery if you begin to notice your battery can’t hold a charge, is charging very slowly or is getting extremely hot.

Batteries begin to fail because they become old, are exposed to extreme temperatures, or fail mechanically.

4. Bad Connection with the Battery Charger or Wall Outlet

Kobalt mowers use a battery that will need to be charged using a battery charger. Check the connection between the charger and outlet.

You can use a standard 120V outlet. The plug style must match the style of your outlet. Do not attempt to modify the plug.

Insert your battery into the charger making sure the contacts on the battery pack engage with the charger and are securely in place. You will most likely have lights on the battery that indicate the level of the battery charge.

5. Battery is Excessively Hot

When your Kobalt battery gets excessively hot, the mower will shut down. The mower has a protection system that shuts the mower off when the battery gets too hot.

The battery gets warm when running the mower. It can become too hot, especially when operating your Kobalt in hot conditions. You will need to let the battery cool before you attempt to restart it.

6. Incorrect Mower Starting Procedure

Whenever you get a new electric lawn mower or one that is just new to you, make sure you check its user manual to know all of your Kobalt mower’s safety features and safety recommendations.

Kobalt uses a safety button to prevent children from accidentally starting the mower by depressing the bail switch bar and hand,e. Not following these procedures won’t allow the mower to start:

Kobalt Push Mower Starting Procedure:

  • With the battery securely in place, push the safety button.
  • Pull the safety bar (bail switch) to meet the handlebar to start the motor.
  • Release the safety button.
  • The mower will shut off when you release the safety bar.

7. Siderails are Not Fully Extended

On some Kobalt mowers, the side rails must be fully extended with the locking clamps in position to securely hold the rails in place. The handle must also be locked into position.

8. Bad Safety Switch

If any of your safety switches fail, including the bail switch, your mower may fail to start. You can test each switch by temporarily bypassing them with a jumper wire. Replace any bad switch.

For your safety and the safety of others, never operate your mower without all of the safety switches in working order.

Read your owner’s manual for all safety switches that may be installed on your Kobalt lawn mower. Read my article on the dangers of electric mowers so you understand why you need to take caution when working on your electric mower.

9. Loose or Pinched Wires

There are many electrical wires running through your lawn mower. Some of these wires may develop a short because they become loose or pinched. Wiggle wires to check for a short. You can also use a multimeter to identify a short.

You can repair these loose or pinched connections using a wire nut. Before beginning the repair, remove the battery.

Also, check with Kobalt if you are still covered by its manufacturer warranty. Repairing a damaged wire yourself can void the warranty.

10. Debris is Restricting Blade Rotation

It is not uncommon for grass clippings, dirt, and other debris to stick to the underside of your Kobalt lawn mower deck.

Check underneath the deck and scrape any debris that has been collected. As a reminder, always remove your battery before working on the deck.

Large amounts of grass in the electric lawn mower deck might be inhibiting your blade’s ability to rotate which can be the root cause of the lawn mower refusing to start.

Overloading the engine due to a plugged mower deck can stop your mower and prevent it from starting.

To reduce overloading the engine, avoid cutting wet grass and raise the cutting height when cutting thick or tall grass. This along with slowing down while mowing will decrease the load put on your Kobalt lawn mower.

11. Damaged Components

Hopefully, your Kobalt mower’s starting troubleshooting doesn’t come to this point, but if it does, you might have a pricy solution on your hands.

While it certainly is not ideal it’s inevitable that, at some point or other, components on your lawn mower are going to wear down and will need to be replaced.

Many pieces need to be replaced routinely and come at a minimal cost, but the most problematic pieces might cost you more than the lawn mower is worth after purchasing the replacement and any professional help required to fix it.

Therefore, you will want to check the components on your lawn mower and make a judgment call about whether it’s worth fixing depending on what is damaged.

Some common pieces that often need replacing on an electric lawn mower include:

  • Batteries
  • Blades
  • Safety switches

We’ve already discussed most of these components and detailed how they can prevent your lawn mower from starting if they are damaged or out of place.

However, a few components we haven’t mentioned in detail that are relevant here are its start switch and motor.

If you discover that either of these pieces is damaged and likely the cause behind your lawn mower not starting, you’re probably better off taking your Kobalt lawn mower to a professional repair shop instead of fixing it yourself.

Contact Kobalt customer service at 1-888-356-2258 for authorized repair locations.

Not only are these components usually pricy, but they are best handled by individuals with extensive mechanical and electrical knowledge who can safely remove the damaged parts and reinstall new ones.

Becky Haddix

Monday 24th of July 2023

My mower wouldn't start because the blade was stuck in dried grass. I originally got the beeping sound that the battery was dead so I tried the other battery and got the same sound. I turned over the mower and discovered the blade was stuck. I removed the dried grass but when I put the battery back in I got the same beeping sound.

Equipment Blog Team

Monday 24th of July 2023

Since you tried two different batteries, your next best step will be to contact Kobalt at 1-888-3KOBALT. You may have a PCB (control board) problem. It's best to talk to customer support to troubleshoot the issue especially if your mower is still under the warranty period.

Henry yarbrough

Thursday 20th of July 2023

It's so hard find enything on this site

Equipment Blog Team

Monday 24th of July 2023

Thanks for the comment. We will be working on a site redesign soon to make it more user friendly.

Kate Risch

Monday 10th of July 2023

mower shuts off frequently

Equipment Blog Team

Thursday 13th of July 2023

This could be caused by a short in the wire or a bad safety switch. If it is still under the warranty period, definitely contact Kobalt for assistance. It's hard to source parts for many Kobalt electric mowers.

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