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Are you in the market for an electric bike and wondering what size battery would be the best fit for your needs? Well, we will discuss just that today.

As electric bikes continue to gain popularity in Australia, it’s essential to understand the factors that influence battery performance and make an informed decision. In this blog, we will delve into the world of electric bike batteries, specifically focusing on the ideal battery size for optimal performance. 

From understanding battery capacity to assessing your riding needs, we’ll cover everything you need to know to select the right battery size for your electric bike – one that perfectly aligns with your requirements. So, let’s get started!

Understanding Battery Size of Electric Bikes

When it comes to electric bikes, battery size (or capacity) refers to the amount of energy a battery can store. It is typically measured in either watt-hours (Wh) or ampere-hours (Ah). Watt-hours represent the total amount of energy a battery can deliver in one hour, while ampere-hours represent the current flow capacity of the battery over one hour.

The battery capacity plays a crucial role in determining the range of an electric bike. Generally, the higher the battery capacity, the greater the range the bike can achieve on a single charge. This is because a larger capacity battery can provide more energy to power the motor and assist the rider for a longer distance before needing to be recharged.

Relation Between Battery Capacity & Range

The relationship between watt-hours and range can be estimated based on average values, typically ranging from 10 to 12 watt-hours per kilometer (Wh/km). This means that for every kilometer you ride, your electric bike would consume approximately 10 to 12 watt-hours of energy from the battery (in a mix of riding as well as pedal-assist conditions).

To calculate the range, you can divide the total watt-hour capacity of your battery by the average watt-hours per kilometer. For example, if you have a 500Wh battery and assume an average consumption of 10Wh/km, you can estimate a range of approximately 50 kilometers (500Wh ÷ 10Wh/km = 50km). 

Keep in mind that the actual range may vary depending on several factors, including terrain, rider weight, level of pedal assistance, and weather conditions.

Understanding the relationship between watt-hours and range is essential when selecting an electric bike battery. By considering your typical riding distance and the range you desire, you can choose a battery with an appropriate watt-hour capacity to ensure that you have enough power to enjoy your rides without worrying about running out of battery.

What About Other Factors?

In addition to the battery capacity, there are a lot of other factors that affect your range. Some of them are as follows:

  • Motor efficiency: The efficiency of the electric bike’s motor plays a crucial role in battery range. A more efficient motor can convert a higher percentage of the battery’s energy into useful propulsion, maximizing the range.
  • Rider weight: Heavier riders generally consume more power, resulting in a reduced range. This is because the motor needs to exert more effort to propel a heavier load. The same goes for bike weight as well. For instance, the Engwe C20 Pro has a stellar maximum range of 150km due to its lightweight build.
  • Riding conditions: Factors such as wind resistance, road surface, and temperature can impact the range. Riding against strong headwinds or on rough terrains may decrease the overall range.
  • Assist levels: Different electric bike models offer various levels of pedal assist. Higher assist levels provide more motor power, but they can also drain the battery faster, resulting in a shorter range.

How to Select the Right Battery Size for E-Bikes?

When it comes to finding what size battery would be the best fit for you, it’s important to assess your riding needs and preferences. Let’s take a closer look at some key factors to consider.

Your Riding Patterns

Are you someone who enjoys daily rides, using it as your primary mode of transportation? Or perhaps you’re a weekend warrior, looking to hit the trails on your days off? Understanding your frequency of rides will help you determine the battery capacity that suits your needs.

You also have to consider the distance you typically cover during your rides. Are you planning short trips around your neighborhood or longer excursions into the countryside? This will also impact the range you desire from your electric bike’s battery.

Desired Range Per Charge

Next up, take a moment to imagine your ideal ride. How far do you envision traveling on a single charge? 

Whether it’s a quick trip to the local market or a full-day adventure exploring new landscapes, considering the maximum range you’d like to achieve will help you narrow down your battery size options. You can then simply multiply your range with 10Wh/km to get an idea about what size battery you would need.

Terrain & Riding Conditions

The type of terrain you’ll be traversing is another crucial factor. Are you mainly riding on flat surfaces, conquering hilly terrains, or venturing off-road into challenging trails? Keep in mind that steeper inclines may require more power, necessitating a larger battery capacity.

Also, take into account the weather conditions you’ll encounter during your rides. If you frequently ride in colder climates, be aware that lower temperatures can affect battery performance. In such cases, opting for a slightly larger battery capacity can ensure consistent power output.

Frequency & Duration of Rides

Consider how frequently you plan to use your electric bike throughout the day. If you have multiple rides scheduled, it’s essential to choose a battery with sufficient capacity to handle each journey without needing to recharge in between.

Additionally, evaluate the duration of your rides. If you enjoy long excursions that span several hours, a larger battery capacity will provide the sustained power you need to keep going without interruption.

Other Factors to Consider

  • Battery charging time: Evaluate the charging time required for different battery sizes. Larger capacity batteries may take longer to recharge fully. Consider if the charging time aligns with your schedule and how frequently you plan to recharge.
  • Charging infrastructure: Assess the availability of charging points in your area. Determine if there are convenient locations where you can charge your electric bike, whether it’s at home, work, or public charging stations. Consider the accessibility and compatibility of charging infrastructure with your chosen battery size.
  • Consider weight distribution: Larger capacity batteries tend to be heavier, and their placement on the bike can affect its handling and balance. Evaluate if the added weight is manageable and if it affects your comfort and control while riding.
  • Frame design and battery integration: Some electric bikes have integrated battery systems that seamlessly blend with the frame. This can help distribute the weight more evenly and enhance the overall aesthetics of the bike.
  • Determine your budget range: Set a realistic budget based on your financial capacity and the value you expect to derive from the battery. Also, consider the long-term investment aspect. While larger capacity batteries may have a higher upfront cost, they can offer greater value over time due to their extended range and longevity.

By considering these practical aspects, you can choose a battery size that aligns with your lifestyle, usage patterns, and preferences. Finding the right balance between practical considerations and battery capacity will optimize your electric biking experience.

What Size Battery is Best for an Electric Bike?

When considering battery size options, it’s important to align them with your specific needs and priorities. Smaller capacity batteries are suitable for riders with shorter commutes or occasional use, while larger capacity batteries cater to those seeking extended range and maximum power. 

Let’s take a look at the pros and cons of smaller vs larger battery size options.

Small Capacity Batteries

  • Pros:
    • Lightweight and compact, making the bike easier to maneuver.
    • Cost-effective option for riders with shorter commutes or occasional use.
    • Suitable for riders who prioritize a lighter overall weight for their electric bike.
  • Cons:
    • Limited range, requiring more frequent recharging.
    • May not provide sufficient power for riders tackling steep inclines or demanding terrains.

Large Capacity Batteries

  • Pros:
    • Extended range, allowing riders to cover longer distances without recharging.
    • Enhanced power for conquering steep hills and challenging terrains.
    • Ideal for riders planning long-distance trips or requiring maximum power output.
  • Cons:
    • Increased weight, impacting the overall weight of the electric bike.
    • Higher cost compared to smaller capacity batteries.
    • May be overkill for riders with shorter commutes or less demanding riding conditions.

Once you have decided on the range, just multiply it with 10Wh/km to get an idea about what size battery you would need.


Selecting the right battery size for your electric bike is a crucial decision that directly impacts your riding experience. By understanding battery capacity, assessing your riding needs, and considering practical factors such as range, power, and budget, you can make an informed decision. 

Remember to evaluate factors like terrain, charging time, compatibility, and the overall value proposition of different battery sizes. By striking the right balance between capacity, performance, and cost, you can ensure a smooth and enjoyable electric biking experience. 

So, take the time to evaluate your requirements and choose the battery size that empowers you to embark on exciting adventures while enjoying the benefits of electric biking. Happy riding!

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