The Yose Power 48V 10.4Ah silver fish battery is a seat tube style pack providing 499Wh of capacity in the silver fish format. If you've been shopping through our comparison table searching for a 48V silver fish battery that fits the seat tube, then this is a great value for the Wh you receive. Yose Power has been in the European ebike market for quite some time now, and have recently been appearing more and more often on Amazon with ebike batteries aimed at conversion builds and replacement batteries. The 10.4Ah capacity places this on the lower side of capacity for 48V packs, but the silver fish design helps keep the weight down, and the profile clean on the frame.
What really sets this battery apart from others is that it contains all of the typical features you'd find in a silver fish shell, with some additional touches. They include a USB charging port, a LED charge indicator, a safe lock feature, and a 2-pin discharge connector. The included 54.6V 2A charger takes just over 7 hours to bring the battery from dead to full, which is somewhat slower than some of the other batteries we've reviewed that come with 3A chargers, but still suitable for an overnight charge.
Specs and Build Quality
The Yose Power battery runs at 48V nominal and has a 10.4Ah capacity, giving you a total of 499Wh of power. That should provide plenty of energy for an average urban commute and for the occasional recreational ride without causing you to worry about range anxiety. However, if you regularly ride greater than 30 miles on throttle, you'll probably want something larger. Standard lithium-ion 18650 cells are utilized in the construction of the Yose Power battery, and as such, you'll see this exact same cell type used in nearly every single ebike battery on the market today. From what we've seen in the pictures of the silver fish housing, the build quality seems to be solid. A keyed lock feature is provided to help prevent theft when mounting the battery to your bike.
Physical specs
The silver fish design is intended to be installed on the seat tube of an ebike frame and is commonly used with a mounting bracket or base plate. The silver fish design is among the most popular ebike battery designs and is very versatile, working well with a variety of frames including step-through frames, cruisers, and many conversion builds that do not allow for a downtube install. Included with the battery is a mounting base, which should greatly simplify the installation process. The 2-pin discharge connector is the connector that will connect to your controller. Prior to purchasing, please verify that your controller utilizes a 2-pin connector, or plan to purchase an adapter.
An LED indicator light on the battery provides you a simple way to determine how much charge remains without having to go to a separate display. Additionally, the inclusion of a USB port is a convenient feature if you want to charge your phone or GPS device while you're riding. Features like this are not always included in the less expensive silver fish style batteries you'll find online.
BMS and motor range
Yose Power indicates that this battery has a standard discharge rate of 10A and a maximum discharge rate of 20A. When utilizing a 10A continuous flow, at 48V you're looking at 480W of continuous flow. The maximum of 20A allows for a theoretical peak of 960W, but sustaining the flow of 20A continuously would severely stress the BMS and significantly decrease the lifespan of the battery. Yose Power suggests that this battery is compatible with motors ranging from 100W to 700W, and that's consistent with the 10A continuous discharge rating.
For a 250W or 350W commuter motor, the 10A continuous discharge rating would provide plenty of power. If you were running a 500W motor, you would be near the limits of the BMS when operating under heavy throttle conditions. And for a 750W motor, you would likely exceed the 10A continuous discharge rating under normal conditions of operation, which could result in the BMS cutting power during times of high demand, such as climbing hills.
Form Factor and Compatibility
The silver fish design is one of the most widely used ebike battery designs, and for good reason. It mounts neatly on the seat tube of the ebike frame, keeps the center of gravity relatively low, and is simple to remove for indoor charging. The safe lock feature included with the Yose Power battery allows you to safely lock the battery to the mounting base when the bike is parked and allows for easy removal when you need to charge the battery indoors.
There are several factors that will determine compatibility, namely the physical mounting and the electrical connector. The mounting base that is included with the Yose Power battery should work with most standard seat tube mounting bases for silver fish batteries. The 2-pin discharge connector is also commonly found in the conversion kit market, however it is not universal. If your controller has an XT60, Anderson, or another connector type, you will need to get an adapter. Yose Power also mentions that if you are unsure about compatibility, contact them for assistance.
This battery is best suited for conversion ebikes with 250W to 500W motors that require a compact, clean, and neat-looking battery that mounts on the seat tube. It is not designed for specific commercial ebike brands like Rad Power or Lectric, which use proprietary battery designs. For a broader look at what is available in the 48V category, browse the battery comparison table where you can sort by price per watt-hour, capacity, and form factor.
Real-World Range Estimates
At 499Wh, the Yose Power battery should deliver roughly 15 to 30 miles of range depending on your motor size, terrain, rider weight, and pedal assist level. For a 250W motor on flat terrain with moderate pedal assist, you could push toward the upper end of that range. With a 500W motor using heavy throttle on hilly terrain, expect closer to 12 to 18 miles.
The 7-hour charge time with the included 2A charger means you are looking at overnight charging for most use cases. If you ride daily and drain the battery significantly on each ride, you will want to plug in as soon as you get home to ensure a full charge by the next morning. Some riders find 2A chargers too slow and upgrade to a faster 3A or 4A charger, but make sure any aftermarket charger matches the voltage and connector before using it.
One thing to keep in mind is that the 10A continuous discharge rating means the BMS will limit sustained output more than batteries with 20A or 30A continuous ratings. If you are a heavier rider or frequently ride in hilly terrain, the BMS could cut power during peak demand. This would not damage the battery, but it could leave you without motor assist at the worst possible moment.
What Amazon Reviewers Are Saying
The Yose Power 48V 10.4Ah silver fish battery currently has no customer reviews on Amazon. This is a newer listing in the Yose Power lineup, and it has not yet accumulated buyer feedback. The fact that there are currently no customer reviews means you will be making a purchase based solely upon the manufacturer specifications without the benefit of real-world testing from previous customers.
Yose Power does have a broader presence in the ebike battery market, particularly in Europe, and their other listings on Amazon have generally received positive feedback. The brand is not unknown, which provides some baseline confidence. But without reviews specific to this particular listing, you are relying on the brand reputation and manufacturer specs.
If you want to check whether reviews have been posted since this article was written, visit the Amazon listing for the most current buyer feedback. For batteries with established review histories, check our ebike battery reviews for alternatives.
Who Should Buy This
The Yose Power 48V 10.4Ah silver fish battery is a good fit for riders building a conversion ebike with a 250W to 500W motor who want a compact, clean-looking battery that mounts on the seat tube. The silver fish design is extremely versatile and widely supported in terms of compatibility. The features included with the Yose Power battery, including the mounting base, safe lock feature, USB port, and LED indicator, make this a very complete package.
The 10A continuous discharge rating is the primary limiting factor for this battery. While it is perfectly acceptable for urban commuting and casual rides, it is not the optimal choice for performance-oriented ebikes or heavy riders in hilly terrain. The lack of customer reviews also means you are buying without the benefit of real-world feedback from other riders.
If 499Wh of capacity is not sufficient for your needs, Yose Power has larger silver fish batteries within the same line with increased amp-hour ratings. If you are looking for a battery with more headroom regarding discharge, consider batteries that have 20A or 30A BMS ratings. Browse our ebike battery reviews for more options across different form factors and capacities.
Frequently Asked Questions
Is this battery compatible with my motor? Yose Power rates this battery for use with motors ranging from 100W to 700W. Given the 10A continuous discharge rating, this battery will support up to about 480W of sustained output at 48V. For motors with outputs greater than 500W, you will likely reach the BMS current limits during periods of heavy throttle usage.
Is a charger included with the battery? Yes, the 54.6V 2A smart charger is included with the Yose Power battery. Based on the manufacturer specifications, the battery will take just over 7 hours to fully charge from empty.
What is the 2-pin discharge connector? The 2-pin connector is a common output plug that is used in a wide variety of ebike conversion kits. If your controller utilizes a different connector type, such as XT60 or Anderson, you will need to obtain an adapter. Contact Yose Power prior to purchasing to confirm compatibility.
Can I use the USB port to charge my devices while riding? Yes, the built-in USB port will allow you to charge your phone, GPS device or other small device while you are riding. Keep in mind that drawing power from the main battery to charge your device will reduce your overall riding range.
Will the battery lock onto my bike? Yes, the silver fish housing includes a keyed safe lock feature that will allow you to safely lock the battery to the mounting base when you park your bike and quickly remove it when you need to charge the battery indoors.
How long will this battery last before requiring replacement? Standard lithium-ion 18650 cells will typically last for 500 to 800 charge cycles before noticeable capacity loss occurs. Assuming you are charging your battery daily, you can expect the battery to last 1.5 to 2.5 years of normal use before it begins to lose significant range.