Why is my Motorcycle Battery not Charging?

If you’re an avid motorcycle enthusiast, it can be aggravating when your battery will only hold a charge. It makes life difficult for you and your bike and can also cause monetary stress—mainly if several trips to the mechanic don’t produce any answers.

Motorcycle Battery not Charging

Today, we’ll explore some of the most common causes of why a motorcycle battery might not be charging correctly so that you can get back out on the open road in no time!

Overview of Motorcycle Batteries and their Function

A motorcycle’s battery is a vital element that powers the bike’s starter motor, lighting system, and electrical circuits. Without a working battery, your vehicle will not function properly and may be completely inoperable. Understanding how this piece of equipment works can help you quickly assess any issues regarding charging problems.

The most common type of motorcycle battery is a lead-acid or rechargeable battery with removable plates and cells filled with sulfuric acid electrolyte solution. This type of battery should be regularly checked for signs of wear and tear, such as corrosion, leaking fluid, or damage from changing temperatures or environments.

Additionally, it should always be kept fully charged—anytime your vehicle is parked for longer than two weeks, it should be connected to a trickle charger.

Common Reasons Why Is Your Motorcycle Battery Not Charging

The voltage regulator or rectifier controls the number of electrical components and current supplied to the battery while charging. If either of these components malfunctions, your bike’s battery won’t receive enough power to get a full charge and may even stop working altogether.

  • Faulty Alternator

An alternator supplies power from the engine to keep recharging the battery as you ride. If it’s defective, your motorcycle will not charge properly and could cause other issues, such as poor starting performance or flickering headlights.

  • Corroded Battery Connections

If the battery connections are corroded, the power cannot adequately be distributed to the battery. This could cause it to take longer than usual or even stop charging altogether.

  • Loose Connections

If the connections are not securely fixed to the battery, they may become loose, and no power can adequately reach it. Please ensure your battery’s contacts are snugly fastened before you try recharging it.

  • Dead Battery Cells

Over time, your motorcycle’s battery cells can die due to a lack of maintenance or frequent use. This can cause it not to charge at all or only partially charge—indicated by slow starts and inadequate lighting.

  • Faulty Battery

Your battery may need replacing if it has reached its maximum lifespan or due to a manufacturing defect. You should also regularly check your motorcycle’s battery for signs of wear and tear, such as swelling, bulging, leaks, or corrosion.

How to Diagnose the Problem with Your Motorcycle Battery?

Diagnose motorcycle battery

You will need to do a few things to diagnose the problem with your motorcycle battery. First, check all the connections and cables plugged into it—they should be clean and free from any signs of corrosion or rust. Then, use a multimeter to test the voltage output of the charging system. If it is below 13 volts, there may be an issue with your alternator or regulator/rectifier.

Finally, if all else fails, you can take your battery in for testing at a local auto shop or specialized motorcycle mechanic. They can accurately determine what’s wrong and provide an appropriate solution.

Troubleshooting Tips for Fixing a Dead or Weak Battery

  • Clean the Battery Terminals

Before further troubleshooting, clean all of the battery terminals with a wire brush and spray them with a corrosion-resistant solution. This will help ensure that power can freely flow through them without interruption.

  • Check Your Electrical System

If your electrical system is faulty or not working correctly, it may prevent your motorcycle from charging properly. Check for loose connections, broken wires, frayed cables, and other signs of wear and tear.

  • Test the Alternator Output

You can use a multimeter to test the output of your alternator. If it’s lower than 13 volts, there is likely an issue with either the alternator or the regulator/rectifier.

  • Recharge Your Battery

If all other steps have been completed and you still need to get a chance, then it may be time to recharge your battery by either buying a trickle charger or taking it to a local auto shop for professional help.

What To Do If You Cannot Solve the Issue on Your Own?

Fixing motorcycle battery

If you cannot solve the issue with your motorcycle’s battery alone, it is best to take it to a professional who can accurately diagnose and repair it. A qualified mechanic should be able to inspect all of the components related to your battery and provide you with an appropriate solution.

They will also be able to advise you on how best to maintain and care for your battery sulfation to ensure it stays in top condition for as long as possible.

In addition, they may recommend replacing worn-out parts or accessories to get the most out of your bike without having any further issues down the line.


A dead or weak motorcycle battery can be a significant inconvenience, but with the proper knowledge and tools, you should be able to diagnose and fix the problem independently. However, if that fails, it is okay to take it to a professional who can provide an accurate assessment and solution.

Properly maintaining and caring for your motorcycle’s battery tender will also help ensure you don’t run into further issues. As long as you follow these steps, you should have no problem getting back on the road and enjoying your ride in no time!

Frequently Asked Questions (FAQs)

How often should I check my motorcycle battery?

It is generally recommended that you check your motorcycle’s battery voltage at least once a month or any time you notice signs of wear and tear, such as swelling, bulging, leaks, or corrosion.

What can cause my motorcycle battery to die?

Common causes of dead or weak motorcycle corroded battery terminals include corroded cables and terminals, faulty electrical energy motorcycle charging system components, low alternator output, or a manufacturing defect.

What should I do if I cannot solve the issue alone?

If you cannot solve the issue with your motorcycle’s battery alone, it is best to take it to a professional who can accurately diagnose and repair the problem. They will also be able to advise you on how best to maintain and care for your bike battery to avoid any future issues.