How To Change Electric Bike Battery

How To Change Electric Bike Battery

Electric bicycles use rechargeable batteries to provide the power needed for driving. Some of the most commonly used batteries include nickel-cadmium batteries, lithium-ion polymer batteries, sealed lead-acid batteries, and nickel-metal hydride batteries.

Like any other battery, an electric bike battery needs to be replaced after a period of use.

Their service life depends on the type of use. Once they are no longer reliable, it is best to replace them with new batteries. Changing the battery allows you to continue to enjoy the quality service provided by the bicycle with the least problems.

When to change the e-bike battery

When you should consider replacing the e-bike battery:

1.End of life cycle

A typical electric bicycle battery can last for 3 to 5 years.

It depends on how you take care of it throughout its life cycle. For example, if you put the battery in a dry place and away from temperature fluctuations, your battery will last longer. If your battery becomes inefficient with age, you need to replace it.

2.Physical damage

Physical damage may be caused by road bumps and vibrations encountered during long-distance travel.

This may cause the battery to shift, short-circuit the cable, or damage the battery casing. It may also cause the terminals to come into contact with conductive surfaces, resulting in fire and heat generation. If you find serious physical damage, replace the battery immediately.

3.Charging failed

When your battery fails to charge, your bicycle will stop running.

Any other electrical appliances (such as lights) you may have will also stop working. This may be due to a dead battery. A dead battery cannot be charged, let alone keep it. Since charging failure may be caused by many reasons, it is best to ask qualified professionals to check the battery. He/she will perform a differential diagnosis to determine the problem. If the battery is completely dead, you need to replace it.

4.Shorter cruising range/short battery life

One of the most common complaints of e-bike riders is the short life of their bicycle batteries.

Some batteries tend to have a limited lifespan and may need to be replaced when they can no longer provide the range that meets the user’s needs. If you find yourself constantly checking and monitoring the battery because you are worried about running out of power, you need to buy a new battery that provides better range.

5.Battery swelling

The swelling of the battery is due to an incomplete chemical reaction leading to the production of gas.

The gas fills the battery and expands it. In addition, if the inner layer of the battery cannot properly separate chemical substances and components, the battery will swell. Allowing your bicycle to run with the battery swollen can cause serious injury. Replace the battery immediately and it starts to swell.

6.Hot battery

There are many reasons why an electric bicycle battery gets hot or hot. This may be due to an external short circuit.

If you store the battery near other metal objects, these objects may act as a bridge between the negative and positive electrodes of the battery. The battery will also swell due to internal vibration.

This may be caused by a sudden drop. Batteries generate high currents, which can lead to high temperatures. Once the battery starts to heat up, replace the battery.


Electric bike battery containing sulfuric acid emit hydrogen gas.

The gas then mixes with other elements around the battery, causing the battery terminals to corrode. Overcharging and undercharging can also cause battery corrosion. You may need to use a toothbrush and baking soda solution to completely remove the rust. If this does not work, your battery may be out of its use and may need to be replaced.

8.Bad smell

The battery may emit a strange smell due to overcharging, freezing or internal short circuit.

This is usually characterized by an unpleasant smell of rotten eggs. For batteries that use a mixture of water and sulfuric acid, this situation is very common. If not checked, sulfuric acid may damage other parts of the electric bicycle. In severe cases, it sometimes produces smoke.

Factors to consider when replacing electric bicycle batteries:

Battery Type

Electric bicycle batteries include nickel-cadmium batteries, lithium-ion polymer batteries, sealed lead-acid batteries or nickel-metal hydride batteries.

Knowing which type of battery your electric bike uses can help determine the correct replacement option. It is important to use the same type of battery. Please consult your user manual to determine which type of battery your electric bike uses.

Battery pack size

The battery pack size refers to the height, length, and width of the battery.

There are different sizes of batteries. You want a battery that can fit easily and perfectly into an electric bicycle. Please refer to your user manual to find out which group your battery belongs to.

Electric capacity

The capacity of the battery is expressed in ampere-hours or watt-hours.

To make it easier to compare multiple options, please use the formula “v*ah = watt-hour (voltage times ampere-hour equals watt-hour). This puts the battery capacity in the same unit for better comparison. The battery capacity will determine you The mileage.

Battery life

When purchasing a replacement battery, check its manufacturing date.

Choose a battery that was produced no more than 6 months ago. This battery is considered fresh. They are also unlikely to cause any problems during use.

The Brand

Most electric bicycles are powered by batteries obtained from a specific brand.

It is best to choose the same brand when looking for alternatives. If you want to buy other brands, please remember to follow the requirements and specifications specified in the user manual.


Reserve capacity

The reserve capacity of the battery determines how long it can last under a certain current consumption.

A battery with the “RC @ 30A = 150 minutes” specification means that at 80°F, the battery can provide 30 amps of current for 150 minutes. The usable voltage normally considered for this measurement is 10.5 volts. Remember, the greater the current consumed, the lower the battery capacity.

Battery style

The style of the battery will determine how easy it is to replace the battery.

The universal battery that can be installed on the bicycle frame can be easily replaced. There are many alternative options on the market to choose from. If you have a specific brand battery with a unique style, it may cost more to replace it.


There are a large number of battery manufacturers currently on the market.

Some of them offer very affordable battery options and seem to be a bargain. Do some thorough research to determine whether the product meets your expectations. Some manufacturers use low-quality materials to produce cheap and unreliable batteries.

How to change your electric bike battery

The process of changing the battery of an electric bicycle varies from bicycle to bicycle.

This is because electric bicycles are designed and manufactured in different ways, and what works for one brand may not work for another brand.

However, this is the typical process of replacing the battery on an electric bicycle:

Unlock the battery kit:

1.This can be done with a key or by unscrewing the bolts that hold the battery box together.

2.Unplug all wires that may be connected to the battery.

3.If the battery is held in place by the clip, loosen the clip to loosen it.

4.When carefully removing the battery from the bicycle, support the battery with your hands.

5.Install a new battery and bolt it in place.

6.Make sure that all clips and anything else holding the old battery are safely reinstalled.

7.Reconnect all wires and safely close the battery kit.

The benefits of replacing electric bike batteries

Here are some of the benefits of using a brand new battery:

Greater power

The new battery provides more power for your electric bicycle.

This is because it ignites plugs better than old batteries and transfers power faster. Most people always notice a sudden improvement after installing a new battery.

Better plug ignition

With a new battery, you can improve the ignition time and provide better power to the entire bike.

This means that you will never experience any power delays, as this can sometimes happen with old batteries.

Stable power supply

New batteries are unlikely to have small problems that prevent the smooth flow of current.

Take corrosion, internal short circuits, and external shocks as examples. Unlike old batteries, new batteries are not prone to such problems.

Alleviate concerns about sudden failures

When using a new battery, you are unlikely to worry about battery failure.

One of the most important things when riding an electric bike is peace of mind. Unlike old batteries, new batteries are unlikely to leave you at a loss or inconvenience.


Buying a battery from an authorized store means that you can enjoy warranty service.

Warranty promotes quality and reliability. The longer the warranty period, the higher the quality of the purchased product. With a new battery, you can guarantee that if the battery is defective, the supplier will provide a solution to the defect.

Upgrade to the latest technology

Battery manufacturers have been committed to improving the performance of all types of batteries.

For example, engineers are trying to make batteries with shorter charging times and longer power supply times. Replacing the battery means that as long as there are these innovations, you can benefit from them.

Factors affecting battery life

When it comes to batteries, there are many factors that affect their service life:

Area temperature

The capacity rating of the battery is based on the specific ambient operating temperature.

Any change will change the expected life and performance of the battery. The general rule of thumb to remember is that a 15°F increase in temperature from the normal 77°F will reduce the life expectancy of the battery by 50%.

Attachment has been inserted

The performance and lifespan of an electric bicycle battery is largely affected by its type of use.

If you use it frequently, such as inserting many accessories, it will shorten its service life. The battery runs out quickly, which means you have to charge it frequently.

Vibration on rough roads

Vibration caused by acceleration inertia and rough roads has a serious impact on the electrical and mechanical performance of electric bicycle batteries. They cause fatigue and may cause short circuits, small metal parts in contact with other battery parts.

Travel frequently

If you only ride an electric bicycle for very short trips, the battery may never be fully charged, which may wear it out quickly and it may also cause accidental damage. As we all know, short and fast travel will accelerate the deterioration of the battery.

Battery life

A typical electric bicycle battery lasts for 3 to 5 years and then becomes very unreliable. Sometimes, it may not last more than 2 years. If you start experiencing battery problems after 2 or 3 years of use, your battery may be about to end its life cycle.

Battery chemistry

Over time, the battery’s ability to transport and store electricity will slowly decline due to its chemical composition. Even if it is properly maintained and used, you still need to replace the battery after a period of use.

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