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Overview of Dual Battery Solution and Range Extender Battery

Some e-bike riders need a longer range for their e-bike. The mtb user wants to have more fun on the dirt roads or e cargo bikes users need to carry more goods for long rides. What would be the perfect solution for them to have a range boost for their e-bike? Dual battery and range extender?

Discover more about dual battery solutions from LEV battery manufacturer.

What are Dual battery system types?

There are two dual battery setup types: parallel (dual battery) and power bank (range extender). The main difference between them is how they operate as well as how much power each type can produce.

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dual power battery

Both types were designed to solve a problem, but it came down to personal preference for those who purchased e-bikes equipped with two e-bike batteries or range extender batteries.

The parallel battery type

We have the battery control unit fully integrated with the BMS. It will optimize the use of both batteries and keep them at the same voltage when they are connected. With two batteries in parallel, the output voltage is the same as one battery, but the amp hours are doubled.

This way allows both battery discharge at the same time and has twice the range or power of a single battery. It increases the total capacity directly.

Another way is having only one battery power the e-bike, and automatically switch to the second battery when the first one is out of power. Also, it can be switched manually as well. Each battery in a dual battery system can power the motor independently.

Both ways can give riders more battery capacity and more range for a smooth ride. For dual battery system, it will also improve the acceleration of your e-bike.

Advantages of an e-bike Dual battery

A dual battery system offers several advantages over just one battery system. This is especially important for those who want to ride their electric bikes for long distances.

The dual battery system is a more permanent solution. Once it’s installed, it will be there as long as riders own the specific bike. In other words, riders can focus on the riding experience without worrying about the charge level or when to recharge the battery. With eco mode, riders can have even longer rides.

For example, dual battery systems can provide longer run times, more power, and greater flexibility. The Bosch dual battery system is a great example.

They can also be used to store energy from solar or wind systems, providing a backup power source in the event of an outage. Dual battery systems are the best option for those who want the most from their e-bike.

Disadvantages of a Dual battery system

A dual battery system has a few disadvantages.

First, it can be more expensive than a single battery system, because you need to purchase an extra battery.

Second, it can be more complicated to install and design. And require a spare battery control unit or fully integrated with BMS.

Finally, it can add additional weight to the e-bike, which can affect performance.

However, these disadvantages are outweighed by the many advantages of dual battery systems.

The range extender type

The range extender is a second battery, that is plug-in with the main battery. When the main battery is getting low, the range extender battery can start to charge the main battery. It works as a “power bank”.

The range extender battery usually has a smaller capacity than the main e-bike battery. When the main battery is drained, the range extender battery will start to power charge the main battery. Some systems may require the e-bike to stop when charging the range extender battery.

range extender

Advantages of a range extender battery

Riders will not need to modify their e-bike or dual battery system. Just mount it on the down tube or top tube. Even can work in their backpack.

Also, thanks to the smaller capacity and size, it is easier to carry with riders in their backpack. While riders check the view or take a lunch break, it will start charging. After that, they can take the ride again.

It is affordable, easy to use, and a readily available way to increase ride quality.

Disadvantages of a range extender

Just as with any other product on the market, there are a few disadvantages that come with using a range extender battery. Depending on your needs, it may or may not be a major drawback.

The main disadvantage of the range extender battery is that you will have to keep charging two batteries separately, which can quickly become tedious and time-consuming if they’re drained at different times.

Another issue with the range extender is the charging rate. Because it works as a power bank, it usually takes the same amount of time to fully charge your main battery as using the normal charger. If you are doing a lot of climbing with your e-bike, the range extender may not have enough power to keep up.

The last part is if the main battery is dead, the range extender may not power your e-bike directly. 

Despite these few disadvantages, the range extender battery is still a great option for those who want to extend the range of their e-bike.

Which Dual or Range extender battery type should riders choose?

There are advantages and disadvantages for both dual/range extender battery types which will depend on your product preference as well as what you plan on designing the electric bike for.

The best thing that can do is to test out different dual/range extender bikes to see how they feel while riding them because it may come down to comfort rather than what looks cool or has more power output.

Also, don’t forget about the price! Even though it might look like dual batteries are the way to go, you may find that a range extender battery might be compatible with your existing product line.

The future of electric bikes

The dual battery system (two parallel batteries or battery + range extender) has the potential to take electric bikes into the next generation. This system provides both high power and extended range, which is what you need for an e-bike to become your primary mode of transport. This means that in the future there may be more e-bikes with dual battery systems than those using a single battery.

The dual-battery system is not only more powerful, but it is also easy to maintain and service. This means that there is less chance of a breakdown.

And you will spend less time and money on repairs. So overall, the dual-battery system provides many advantages – making it the better option for your e-bike.

Tritek solution

dual battery solution

Our Range extender with smart BMS. It works as a power bank and can work with many popular systems and recharge your main battery.

It has 180 watt-hours of energy and supports up to a 3A discharge rate as a power bank. A suitable solution for your current product line. It is perfect to place on the bike down tube or water bottle holder. Easy fit in different frame sizes.

Tritek also provides a dual battery setup. With our new BMS battery technology, it can safely switch or parallel. The frame battery’s low-weight design can increase range without too much additional weight.

Dual battery systems are the best option for those who want the most from their e-bike. Compared to a range extender battery, dual batteries offer longer run times, more power, and greater flexibility.

However, depending on your needs and riding style, they may not be a deal-breaker. If you have any other questions about dual-battery for e-bikes or range extenders, feel free to contact us for further information.

Thank you for reading! We hope this article has helped inform you about the advantages of dual-battery E-bikes. Stay safe and have a great ride!

Read more:

  1. E-bike trend in 2022 — in-tube batteries

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Bluen Lee

Hello, I'm Bluen, I have over 25 years in the battery industry.
Throughout my career, I've developed a deep understanding of the battery market and kept up with the latest trends in R&D.
I'm excited to share my insights and knowledge with you through my blog.


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