Do Ebikes have fuses? (Testing & Replacing With PICs)

Do Ebikes have fuses



One of the things that disturb the peace of any electric bike rider is that his electric bike battery is not working. In fact, despite the electric bike battery being one of the most important and most expensive parts of the bike, in the end, it is a regular lithium-ion battery, which makes identifying problems in it easy and simple and does not require a great effort.


In most cases, any defect in the ebike battery can be repaired by replacing the part that has a problem.


Today, in this post, we will explain one of the reasons that lead to the battery being unable to work, which is a damaged electrical fuse.


Do Ebikes have fuses?


As a general rule, Yes. there are fuses in the electric bike battery and it works to sense the heat resulting from the passage of electric current and cuts the current in case of high temperature.


How many fuses does Ebike Battery have?


As a general rule, in most batteries, there are 2 fuses. The first is used to sense the heat of the electric current entering the battery through charging, and its capacity is usually between 5 to 15 amps, depending on the capacity of the battery.


As for the second type, it is to sense the heat of the current coming out of the battery to the controller and the motor, and its capacity is usually greater than the first fuse, and it is usually between 30 to 40 amps.


What Are the signs that tell it’s a fuse problem?


Fortunately, there are signs that may tell you that you have a problem with the fuse, which will make you somewhat relieved because you will know that the solution to the problem is very simple.


1- The battery is not working at all.


If you try to turn on the battery via the power button and it does not respond at all, this is a sign that the problem may be in the two parts of the external battery board or the fuse.


2- The charger is working fine.


If you put the battery on the charger and the battery does not charge at all, you may have to test the charger through several steps that we explained in this post.


How Do I Test My Electric Bike Charger? (Beginners Guide)


On the other hand, if you have a second battery, you can try to charge the second battery with the same charger to make sure that it works.

If you verify that the charger is working, this confirms the validity of your suspicions that the problem is either in the board or the fuse.


3- Check the battery Voltage.


The last step for you to know if there is a problem with the electric bike fuse is to measure the voltage of the battery, which we will explain in detail in the next part of the post.


 Testing steps to identify if there issue in the ebike fuses.

In this part, we will explain step by step how to test the bike battery to make sure if there is a problem with the fuse or not.

Step 1: Measure the main voltage of the ebike battery.



Measure the main voltage of the ebike battery


In this step, we will need a multimeter to measure the voltage output from the battery.


  1. Set the multimeter to 200.
  2. Put the positive probe on the positive side of the battery.
  3. Place the negative prop on the negative side of the battery.
  4. Check the reading of the multimeter. If there is no reading, this means that the battery does not produce any current, and this means that there is a problem with the fuse.


Note: If the battery is completely empty, you will not get any reading from the millimeter.


Step 2: Testing ebike battery installed fuse.


Testing ebike battery installed fuse



After making sure that there are no voltage readings for the battery, the second step is to determine if the problem is in the external board or in the fuse.

In order to do this, the easiest way is to remove the fuse and do a continuity test for it. Here are the steps.


  • Set the multimeter to the continuity test. (Radio wave sign)


Set the multimeter to the continuity test


  • Loosen the external screws of the battery to remove the cover.
  • Remove the fuse (try to remove it with your hands without using any metal so that shorts do not occur)
  • Place the positive and negative probes on both ends of the fuse.
  • If you do not hear any beeping, this indicates that the fuse is damaged and does not allow the current to continue.
  • If you hear a beep sound, this indicates that the fuse is intact and the problem may be in the external board.


Note: If you find a burn mark on the fuse, this is evidence that the fuse is damaged and you can change it directly without the need to do the previous test.


What you should do before replacing your ebike fuses.

Before we start the steps to replace the fuse, you should know that the fuse does not destroy itself. and  There must be a reason that led to the damage of that fuse, so it is preferable to do the following:

1- Check all wires

The first step for you is to make sure that the entire ebike wires have no cuts and contact with the bike body without insulation

2- Check the charging source

If you are in the habit of charging your ebike battery in a certain place, you may want to check that the electric current at that source is stable.
If you charging your ebike on the go, using the car battery via the inverter or solar panels, perhaps you should check them as well,
because the instability of the current can lead to severe damage to the battery cells & Fuses as well.

How to replace the Fuses on your ebike?

As a general rule, the fuse can be changed by replacing it with another fuse of the same capacity (plug it into the same socket same as the car fuse).

But there are some tips that you should know when replacing the fuse
  • You will find the number of amperes supported by the fuse written on the back of the fuse, and when replacing, you must replace it with a fuse that works on the same ampere to avoid sparking and stopping the battery again from working
  •  As we mentioned, most batteries have 2 fuses, so it is preferable to change the two together with a high-quality fuse
  •  After installing the fuse, the battery will be able to extract the voltage, so be careful to use metal so that there is no short
  • After installing the new fuse, measure the voltage of the battery by following the previous steps to make sure that the battery is working before placing the outer cover


Yes, there is a fuse in the electric bike (battery), and it represents a safety valve to keep the electric current running without any damage to the internal battery parts.

A fuse test can be done by making a continuity test using a multimeter.

Before changing the fuse, you must check the reasons that led to the damage of the fuse first to ensure that it is not damaged again.

When changing the fuse, the new fuse must be of high quality and support the same amp capacity

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