Stella guide
Replacing the Stella e-bike battery: which battery do you need?
Looking for a new battery for your Stella e-bike? Over the years, Stella has used several generations of front motor systems, and each generation has its own battery version(s). On this page, you can quickly find out which battery belongs to your bike, what the main signs are that your battery needs replacement, and what you should pay attention to before ordering a new one.
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Which battery fits?
Which battery belongs to which generation?
| Generation | Production years | Battery name | Capacity | Article number |
|---|---|---|---|---|
| 1st generation | 2015-2019 | Battery 1.0 (black casing), also known as “ASI 1.0” | 14.5 Ah | 43821 |
| 2nd generation | 2017-2020 | Battery 2.0, also known as “ASI 2.0” | 14.5 Ah | 43831 |
| 17.5 Ah | 43836 | |||
| 3rd generation | 2020-present | Battery 2.1 (Eleon E-Kit), also known as “Eleon 2.1” or “BTC/Eleon 2.1” | 14.5 Ah | 43740 |
| 17.5 Ah | 44024 | |||
| 19.6 Ah | 51015 |
Note: the battery of the first generation (Battery 1.0, article 43821) was also used in part of the second generation. If your bike has a Shengyi 1310/1312 or 1612 motor with this battery, then this is the correct replacement part, regardless of whether your bike is officially classified as “1st” or “2nd generation.”
Not sure which generation or battery type your bike has? Keep your frame number or year of manufacture handy and contact our customer service. We will look up the exact matching item number for you.
Is a replacement battery always an exact copy of your current battery?
Not necessarily. A replacement battery does not always have to be the same brand or model as the battery you currently have. What matters is that the battery is compatible with your system: voltage, connection, and registration with the controller. For example, there are also replacement batteries available with a higher capacity than the original battery, provided that this is offered as an upgrade option for your model. You will then have a greater range with the same bike.
So when ordering, do not just rely on how your old battery looks, but check the corresponding item number for your generation and motor version, or ask our customer service.
The signals
The main signals that your battery needs replacement
These are the signals we encounter most often.
The range has significantly decreased
An e-bike battery loses about 8 to 10 percent of its capacity each year. You will notice it yourself: on a full charge, you no longer go as far as you used to.
Charging is no longer working properly
Is the battery not charging anymore, or does it stop charging halfway? First, check the charger. If it works properly, then the problem is usually in the battery itself or in the battery management system.
The battery is getting warm
A battery that clearly gets warm during charging or riding should not do that. If you also notice a strong smell, smoke, or sparks, stop charging immediately and do not use the battery anymore.
There is moisture in the battery
Moisture in the casing causes corrosion and short circuits. If you see condensation behind the window or traces of water around the battery lock, do not use the battery anymore and have it assessed at a service point.
Before you order
Does it seem like a battery problem, but is it something else?
Since the battery is usually the most expensive component, we always try to rule out whether the cause lies elsewhere first.
The charger
A charger that no longer works looks exactly like an empty battery that no longer charges. If possible, test with another charger before ordering a battery.
The controller
If the controller is defective, the bike will not provide assistance while the battery is fully charged. The display often shows an error message. Read more in Stella display replacement.
The battery contacts and wiring
Dirty or bent contacts in the battery compartment, or a cable that has come loose, can cause intermittent support that resembles a broken battery.
Not sure it's really the battery? Our service partners have a lot of experience in making the right diagnosis and can check whether it's really the battery.
Order it yourself
Stella batteries per generation
Do you know the article number from the table above? Order your battery directly. If you are still in doubt, call or message us — we will check it with you.
Stella batteries
Need help?
Find a Stella service point near you
Are you unsure if it is really the battery, or do you not know which article number you need? Then you don't have to figure it out yourself. Keep your frame number or year of manufacture handy, and we will find the right part for your bike.
Enter your postcode to see where you can take your Stella. You can go to one of our service points, which work with original parts.
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With our software and our parts.
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No service point near you? Fill in the form on our Stella page and we'll find a mechanic for you.
Frequently asked questions
About Stella batteries
Is your question not listed? Contact us, we are happy to help.
Can I also use a replacement battery from another brand?
This is possible, but we do not recommend it. We see many providers in the market offering batteries, but often the quality and safety are not up to standard. The original battery must meet many different requirements and standards, and this is almost never the case with copy batteries.
Can I have my battery checked?
Yes. A service point can check whether the battery is really the problem. Our service partners have a lot of experience in making the right diagnosis.
How can I best charge my battery?
It is important to charge the battery in a timely manner and not to wait until it is completely empty. Our guideline is to start charging at 20% capacity. Then charge the battery while you can keep an eye on it. So do not do this at night or when you are not home. When the battery is full, you can disconnect it. Do not leave the battery on the charger unnecessarily long; that is not good for the cells.
Should I replace a battery preventively?
For a Slimfit 1.0 battery, we do recommend that. This battery is sensitive to water damage and that can create unsafe situations. Because the Slimfit 1.0 is designed with the battery lock in the battery housing, that is a weak point: moisture enters the battery through the lock. The updated Slimfit 1.1 has been developed together with the original manufacturer, with the lock in a sealed chamber. As a result, that battery is safer and lasts longer.
How long does a Stella battery last?
In practice, we see that a battery is replaced after about 4 years.
More about Stella
Related guides
Stella display replacement
Which display or control pad fits your Stella, and is it really broken?
Stella motor replacement
No assistance? How to test it, and which motor is in your Stella.
Stella knowledge base
Manuals, error codes and repair instructions for your Stella.
Experiences
What our customers say
Knowledge centre focused on total service and sharing know-how, including about special electric bikes. In addition to listening, they are willing to help find solutions. They certainly don't shy away from difficulties. Where other companies gave up, they found the solution. Great service! Highly recommended.
Henk van Veen · 18-07-2025
Yesterday afternoon, a mechanic from Ebikepartners came by to help me repair quite a few Stella bikes. Everything went fantastically well, great service. Customers can be satisfied again.
Anonymous · 05-01-2025
What a fantastic company Ebikepartners is, set up by Gert. I was warmly welcomed with coffee and a very professional diagnosis was made of the problems with the Stella Copenhague. With a well-functioning bike, I was happily able to go home. Kudos to the friendliness and expertise of Peter.
Hans Staller · 18-02-2025
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