18 July 2023

How Do I Know It’s Time to Change My eBike’s Battery?


How Do I Know It’s Time to Change My eBike’s Battery

Are you an avid e-bike rider who noticed a significant dip in the performance of your trusty steed? If so, it may be time to check and determine if its battery needs changing.

With advances in technology over the last few years, electric bike batteries have become increasingly powerful and durable—but they can still break down or need replacing after extensive use.

In this blog post, we will explain how to identify signs of trouble with your eBike’s battery and provide tips on when it’s most efficient to make the change. So dust off those handlebars and get ready for more reliable rides!

Check your bike’s range 

If you’re starting to see a decrease in the distance you can travel on your e-bike, it may be time for a new battery

An electric bike, just like any other electronic device, its performance depends on the condition of its battery. If you’re starting to see a decrease in the distance you can travel on your e-bike, even though you charge it fully, it may be time for a new battery.

Don't wait for your battery to give out mid-ride, leaving you stranded without any assistance. Check your bike's range regularly, and if you notice that your battery starts to cut out at 20-30%, it's a clear sign that you need to replace it. 

Monitor the speed of your bike

Whether you're cruising on motor assist only, or giving it your all on a pedalec, keeping an eye on its speed is essential for a smooth ride. And if you're noticing that it's taking longer to hit those higher speeds than usual, it might be time to investigate the cause.

If your e-bike is taking longer to reach higher speeds, your battery could be the culprit.

While it could be several factors, your bike's battery is a prime suspect. As batteries age, they may not perform at the same level as they did when they were new. It's important to keep in mind what the top speed is supposed to be according to the manufacturer, and if you're not quite hitting that mark, it could be time to replace your battery.

Get yourself a watt meter

One that also measures the voltage of your battery

That meter will tell you the cumulative Ah discharge during a ride. You can compare that to the voltage state of your battery to get an idea of how your capacity is holding up.

For example, if your battery is rated at 19 Ah, connect the watt meter and ride the battery until it is completely drained. If the reading on the watt meter is 15 Ah for example, then you know you have approximately 20% degradation.

Watt Meter

Also check that the fully charged resting voltage of your battery, once you've disconnected the charger is as specified by the manufacturer. A 48 V battery can have a fully charged resting voltage of as high as 54 V.

Pay attention to how long it takes to charge

When it comes to charging our devices, we often just plug them in and forget about them until they're fully charged. However, it's important to pay attention to how long it takes for the battery to reach its limit.

If it takes longer than normal, that could mean the battery has reached its limit.

If it takes longer than usual, it may be a sign that the battery has reached its capacity and is no longer holding a charge as effectively as it once did. It's also a good idea to check the voltage of the battery when it's fully charged to ensure that it's at a healthy level.

By taking note of these important factors, we can help extend the life of our device batteries and avoid any unexpected and inconvenient power outages.

Watch for signs of an aging battery - such as corrosion or bulging of the casing

Your electric bike battery is a crucial component that needs maintenance to ensure optimal performance. One sign of an aging battery to watch out for is corrosion or bulging of the casing.

These symptoms may indicate that your battery is nearing the end of its life cycle and may no longer hold a charge effectively.

Note that this is a regular lithium-ion battery, it is not used in ebikes, however the idea remains the same.

Neglecting a failing battery can lead to a compromised riding experience and potential safety hazards.

Regularly inspect your electric bike battery for signs of wear and tear, and consider replacing it if you notice any significant changes in performance. 

Listen for any unusual noises coming from the battery while riding

When riding your e-bike, it's important to always listen for any unexpected sounds coming from the battery. While these batteries are designed to run efficiently and quietly, there may be times when you hear a noise that could indicate a problem.

By paying attention to any unusual sounds, such as clicking or buzzing, you'll be able to catch potential issues early on and address them before they become more serious. 

electric bike battery melting

Worst case scenario of a battery failing.


In conclusion, eBike batteries are a key part of the overall performance and safety of your ride and should not be taken for granted.

Whenever you experience any decrease in range, slower acceleration, or longer charging time, it's important to take a closer look at your battery. 

Pay attention to the subtle signs such as corrosion or bulging of the casing, noises coming from the battery while riding, and so forth.

Just like all the other components on your bike, checking and maintaining your eBike battery is essential if you want to get the most out of your ride.

Taking the time to give it just a little bit of extra love and care can ensure that you don't end up stuck somewhere with a dead battery.

About the author

The Electric-Biking Contributor Team consists a dedicated team of professional athletes and enthusiasts of electric bikes. We have several members in a team that are real experts in the electric bike battery field and electric bike maintenance. Each of our contributors has owned their electric bike for a minimum of 2–4 years.

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