Common E-Bike Battery Problems And Solutions To Fix Them

Last Updated on December 4 2022 by Sam

6 Common E-bike Battery Problems And Solutions


E-bikes are becoming increasingly popular. But there are still plenty of problems associated with them. One of the biggest issues is battery life. You may think that fixing a battery is easier than replacing it, but it isn't. Most e-bike batteries are made of lithium-ion cells, which are extremely sensitive to damage. Even small amounts of moisture or heat can destroy a cell.

So before you attempt to fix any kind of problem with your e-bike battery, make sure you know how to properly care for it. Here are six common e-bike battery problems and solutions.

1. Swelling Of The E-bike Battery Pack

If your eBike's battery pack is swelling up and you haven't noticed it until now, there's a good chance that it's swollen due to a damaged cell(s). You should immediately stop using your eBike and contact the manufacturer to find out how to fix the issue.

Some eBikes use flat-pack batteries, and these are known to expand if they suffer some damage, especially if they've been exposed to moisture. Other eBikes use cylindrical 18650 Li-ion batteries, and these are far more resistant to expansion.

If you see that your ebike's battery pack has an unusual shape, check to make sure that you've turned off the power before removing the battery pack. You might want to take it back to the shop where you purchased it for repair.

Now, some eBike batteries are located inside the bike's frame. That makes it difficult to notice if you have an expanded battery pack. The only way to check is to drop the bottom plate and remove the battery pack. Be careful not to touch any wires or connectors during this process.

Once you've removed the battery pack, you can inspect it closely to determine whether or not it's swollen. If it is, you'll need to replace the battery pack.

2. Ebike Battery Is Not Charging

If your bike won't charge, then you should check if the battery is dead. You can test whether the battery is dead by using a multimeter. Just plug the meter into the battery terminals and measure the voltage between the positive (+) terminal and the negative (-) terminal. If the voltage reading is below 12 volts, then the battery is dead.

If the battery is still alive, then you should try cleaning the battery contacts. Cleaning the contacts helps prevent corrosion and reduces resistance. You can clean the contacts by rubbing alcohol on them. Be careful not to touch any metal surfaces with the alcohol. After cleaning the contacts, let the battery sit for a couple of minutes before testing again.

Another common problem with batteries is that they may be damaged due to being left discharging for several months. Batteries lose capacity after prolonged discharge. If your battery hasn't been charged for several months, then it might be damaged. Try replacing the battery.

3. Ebike Battery Doesn't Last Long

If your ebike battery life doesn't seem to last as long as it used to, there are several reasons why this might happen. One reason is that your battery may not be fully charged. Another possibility is that your battery is getting dragged by a disc brake. Yet another possibility is that your ebike is riding uphill. There are also other possibilities, including a short circuit in the wiring, motor, or battery itself.

To find out whether any of those factors are causing your battery level to drain faster than usual, try checking the following:

Is your battery being charged to 100%?

Do you have a dragging of the disc brake?

Are you pedaling?

Does your ebike have free wheel bearings?

Have you checked the connections between the battery and the motor?

Has anything broken inside the battery?

A short circuit in the battery wiring, motor, or controller could cause your battery connection to discharge rapidly. You can test for this by using a multimeter to measure the voltage across the terminals of the battery. If the voltage drops below 4 volts, then you've found a problem.

If you find that your battery dip is draining faster than usual, then you should replace it immediately. Li-ion batteries don't hold much charge after 700 charge cycles, so replacing your common battery early could save you money in the long run.

4. The Ebike Battery Pack Is Not Holding A Charge

If your ebikes battery isn't holding a charge after a long ride, there may be a short circuit somewhere or your battery itself may be faulty. You should remove the battery pack from your ebikes and charge it up on the ground before testing it again.

If your ebikes still won't hold a charge, you may have a short circuit somewhere in your bike's wiring or the motors. But if your ebikes battery still doesn't hold a charge, it could mean that your Li-ion battery cells are faulty.

To find out whether your ebikes battery is faulty, try removing the battery pack from your bike and charging it up on a bench before testing it again. If it holds a charge now, the issue will be with your bike - most likely a fault in its wiring or the motors. However, if it still doesn't hold a full charge, your Li-ion battery cells are probably faulty.

It also helps the BMS(battery management system) clear out any glitches it may be having.

How Can I Tell If My Bike's Battery Is Fully Charged?

There are two common ways to tell if your e-bike battery pack is fully charged. One method involves using a battery monitor. Another method uses the LED light indicators on the battery pack or the speed controller.

A battery monitor is a device that measures the voltage across the terminals of the battery. As long as the voltage stays above 12V, the battery is considered fully charged.

LED indicators on the battery pack usually show a number between 0 and 100%. The closer to 100%, the more charge there is remaining in the battery.

Some models of speed controllers have a series of LEDs that indicate how much power is available. These LEDs may be located on the handlebars, the seat post, or the pedals.

5. The Ebike Won't Turn On

Ebike Won't Turn On

If your ebikes won't turn on, there are several common problems that you should check before calling a mechanic.

  1. Make sure that the main switch is in "ON".
  2. Check the fuse for your battery longevity pack.
  3. Check the speed controller.
  4. Hold down the "ON" button for about ten seconds to force the speed control to turn on.
  5. Check that your battery pack is fully charged.
  6. Check that your electrical cables are correctly connected and that they haven't become disconnected.
  7. Check that your removable battery is working properly.
  8. Check that your charger is working properly.
  9. Check that your faulty battery doesn't have any corrosion.
  10. Check that your battery hasn't gotten wet.
  11. Check that your battery isn't dead.
  12. Check that your battery has enough charge left.
  13. Check that your battery issue voltage is correct.
  14. Check that your speed controller is functioning properly.
  15. Check that your electrical wires are securely attached.
  16. Check that your batteries are installed correctly.
  17. Check that your battery terminals are clean.
  18. Check that your charging system is working properly.

6. The Ebike Is Not Speeding Up

Ebikes are becoming increasingly popular. But there are still plenty of issues that come along with riding an ebike. One of those issues is that your ebike may not be accelerating fast enough.

To fix this problem, you need to know how to diagnose six common eBike battery care issues and solutions.

Feedback Magnets Are Dirty

Your ebike's pedals are equipped with magnets that detect whether or not your foot is touching the ground. These magnets are used to determine whether or not you're pedaling forward.

But dirt can build up between the magnets and the frame. As a result, the magnets won't work properly.

So, you need to clean the magnets regularly.

Limit Switch Gets Stuck

A limit switch is located near the rear wheel hub. It detects whether or not your feet are pressing down on the pedals.

In Case you've ever ridden an ebike without using the pedals, you probably noticed that the drive motor doesn't accelerate. That's because the limit switch is stuck. To solve this problem, you need two things. First, you need to turn off the power supply. Then, you need to press the brake levers until the limit switch moves freely.

Pedal Lever Is Broken Or Missing

Pedal levers are located on the handlebars. They control the driving ebike motor.

Sometimes, the levers break or fall off.

How Fast Can E-bikes Go?

E-bikes are limited to 25km/h (15.5mph), which means that once the motor reaches this speed, it stops providing power. You can still pedal faster than this, but you won't be getting any assistance from the main motors.

Once the speed controller detects that you're below 25km/h, the battery manager will again provide power to the main motor, which ensures that you comply with road rules.

That said, there are two common problems that e-bikers face when riding at speeds above 25km/h. One problem is that the battery may run down before reaching the end of the trip. Another issue is that the bike may become unstable due to the lack of torque provided by the erratic motor.

To avoid these issues, here are six common e-bike battery problems and solutions.

Is A 250-watt Battery Sufficient For An E-bike?

A 250-watt battery should be sufficient for most casual riders. However, if you plan on riding off-road trails or doing any serious mountain biking, then you may want to consider upgrading to a 500-watt battery.

Most e-bikes come equipped with a 250-watt motor. But if you're planning on using your bike for anything more than commuting, then you might want to upgrade to a 500-watt motor.

That said, a 250-watt motor is plenty powerful for most casual riders. You can pedal along comfortably at speeds up to 15mph. And you can easily carry 240 lbs of rider weight without feeling uncomfortable.

So if you're looking for a simple commuter e-bike, then you probably won't need to worry about upgrading to a 500-watt motor unless you plan on doing some serious mountain biking.

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