The Yose Power 48V 15Ah is a silver fish style battery that mounts to your seat tube and provides 720Wh of usable power for 48V systems. This battery has a 4.2 star rating based on 110 reviews, making it one of the better reviewed batteries in its class and price point. Yose Power is a company that shows up frequently across various ebike battery categories, and this particular model is designed to replace silver fish packs on seat tubes for various ECOTRIC models. You can compare the cost per watt-hour of this 48V battery to others on our comparison table.
The silver fish form factor mounts behind the seat tube and has a base that clamps to the tube. As a result, the battery is mostly hidden from view while providing a clean look for your ebike. This version comes with a charger, a base, keys to lock the battery, and a 2-pin outlet to discharge power from the battery. That 2-pin outlet is worth noting as it limits compatibility to ebikes that use a 2-pin connector style.
Specs and Build Quality
The specifications for this battery are 48V and 15Ah, resulting in a total of 720Wh of energy storage (48 x 15 = 720). This is a large capacity for a silver fish style battery and is among the largest available in this form factor. Yose Power reports a range of 50 to 175 km (approximately 30 to 110 miles) depending on the level of pedal assistance used during the ride.
Physical specs
The weight of the battery is 11.2 pounds which is in line with what you would expect for a 48V 15Ah lithium-ion battery. Dimensions are listed as 14 x 3 x 4.3 inches (length x width x height). The silver fish style housing is designed to attach to the back of your seat tube via a bracket system. You remove the lock from the mounting bracket, attach the mounting bracket to the back of the seat tube, and then slide the battery down into the housing from the bottom.
There is a LED status indicator on the battery that you turn on by pressing the power button twice. After 2 seconds, it turns itself off to save power. The charger provided is a 54.6V 2A charger that will take approximately 8 hours to fully recharge the battery. That is a bit longer than some of the competition, but this is within the expected time frame for a 2A charger on a 15Ah battery. If you have a job where you ride to and from each day, you can easily charge your battery at home while you sleep. Yose Power refers to the cells as "branded" implying they are using known cell manufacturers as opposed to generic unknown ones.
BMS and motor range
The built-in BMS on this battery is rated at 30A with a maximum standard discharge rate of 10A. Under normal riding conditions the battery will output approximately 10A, but can output up to 30A for rapid acceleration and hill climbing. Given the maximum power output of 30A and the voltage of 48V, the battery will produce up to 1440W of peak power. That should be sufficient for motors ranging from 0 to 1000W.
The BMS protects the battery from short circuit, overcharge, over-discharge, and temperature extremes. These are the typical protections associated with a BMS and are important for your safety when riding with a daily-use battery. While Yose Power does not provide a specific cycle-life rating in the product description, the cycle-life ratings for lithium-ion cells of this quality are generally 800 to 1000 charge and discharge cycles before the capacity begins to degrade noticeably. Assuming you charge your battery once per day, you can expect to get 2 or more years of daily use before you begin to notice significant reductions in range.
Form Factor and Compatibility
As you might expect, the silver fish style form factor is not as universally compatible as a Hailong or downtube-style battery. It mounts directly behind the seat tube via a custom-designed bracket, and the battery slides down into the bracket from the bottom. The Yose Power 48V 15Ah specifies compatibility with the following ECOTRIC Fat Tire Folding Ebike models: FAT20810, FAT20S900, as well as the ECOTRIC Starfish, Dolphin, and Peacedove models.
Importantly, the listing also states that this battery is not compatible with Nakto and Heybike ebikes. While the products appear similar in appearance, the brackets used to hold the batteries in place are actually different dimensions. The 2-pin discharge outlet also restricts compatibility with ebikes that use different connectors. If your ebike currently uses a silver fish style battery with a 2-pin connector and the dimensions match those listed above, you are likely to be compatible. If you are unsure whether or not your ebike is compatible, measure everything carefully and contact the seller prior to placing an order.
Multiple Amazon reviewers have successfully modified their ebikes (including Rattan and DJBikes) to accommodate this battery by simply swapping the mounting bracket. You will need to perform some mechanical modifications and ensure that the dimensions are compatible. If you do not mind performing these modifications, you may be able to use this battery on your ebike regardless of whether the original manufacturer lists it as compatible. Check out our blog for more battery reviews if you are looking for other options.
Real-World Range Estimates
While Yose Power claims you can achieve a range of 50 to 175 km (approximately 30 to 110 miles) per charge, this estimate appears to be overly optimistic at the upper end. Realistic estimates of the range of this battery assume you will be using a 500W motor and a moderate level of pedal assist. Under these conditions, expect a range of 25 to 45 miles per charge. When you use the throttle heavily on a 750W or 1000W motor, the estimated range drops to 15 to 25 miles. One Spanish-language reviewer reported achieving a range of 20 to 25 miles per charge on his ebike, which reflects the amount of throttle use he applies during his rides.
The 720Wh capacity is substantial for daily commutes. If your round trip commute is less than 20 miles, you should be comfortable riding to and from work every day without having to worry about the battery going dead. For longer recreational rides, plan to recharge the battery halfway through any ride that is greater than 30 miles. Since the battery takes approximately 8 hours to charge with the included charger, you will want to plan your recharge times accordingly. Compare how the Yose Power 48V 15Ah holds up against other 48V batteries on the comparison table.
What Amazon Reviewers Are Saying
With 110 reviews and a 4.2 star rating, the Yose Power 48V 15Ah has a relatively high volume of reviews on this product. Most of the reviews were positive, and the majority of reviewers praised the battery's performance as well as the seller's customer service.
One 5-star reviewer purchased this battery as a replacement for a 750W Rattan bicycle and stated that it was a perfect fit after carefully measuring his original battery. He did mention that installing the new battery required some mechanical effort, but felt that the effort was minimal. Another reviewer purchased additional batteries from Yose Power with no issues and described the batteries as being fast-charging and long-lasting. One reviewer who made a mistake and purchased the incorrect battery praised the seller's response to his issue, stating that the seller quickly exchanged it for the correct model.
On the positive side, another reviewer who installed this battery on a DJBike commented that he experienced increased power and longer lasting rides when compared to his original battery. Another reviewer who installed it on an unspecified ebike stated that the battery delivered incredible power and that he was impressed with the performance right out of the box.
Not all the comments are positive, however. One reviewer left a 1-star review because the battery had the wrong hookups for his ebike and he had to send it back. Another reviewer who modified a Heybike Ranger to accommodate the battery stated that the process took approximately an hour and that the original battery was more expensive. He did note that the product description clearly warned him that this battery would not be compatible with Heybike ebikes.
Who Should Buy This
The Yose Power 48V 15Ah is the best choice for riders who have an ECOTRIC Fat Tire Folding Ebike (FAT20810, FAT20S900), Starfish, Dolphin, or Peacedove. If your original battery is failing and you need a replacement with a 2-pin connector and 720Wh of capacity, this is a good option. With a 4.2 star rating based on 110 reviews, you have more confidence in this product than you would if you were purchasing an unreviewed battery, and multiple reviewers have praised both the product and Yose Power's customer service.
If your ebike is not on the official compatibility list, this battery can still work, but you will likely need to modify the mounting bracket and verify that the dimensions of the bracket and the ebike are compatible. Several reviewers have successfully completed these modifications, but this is not a simple plug-and-play solution. Before ordering, please verify the connector type and dimensions to determine compatibility. Browse more ebike battery reviews on our site, and check the comparison table to see how this battery compares on price per watt-hour.
Frequently Asked Questions
What ebikes is the Yose Power 48V 15Ah compatible with? The listing names ECOTRIC Fat Tire Folding Ebike models FAT20810 and FAT20S900, plus the Starfish, Dolphin, and Peacedove. It explicitly does not fit Nakto or Heybike models without modification.
What connector does this battery use? It has a 2-pin discharge port. This is important to check before ordering because many ebikes use different connector types. If your current silver fish battery uses a 2-pin connector, you are likely compatible.
How long does the Yose Power 48V 15Ah take to charge? About 8 hours from empty to full with the included 54.6V 2A charger. That is a bit slower than average, so plan on overnight charging or all-day charging at work.
How much range can you get from 720Wh? Realistically, 25 to 45 miles with moderate pedal assist on a 500W motor. Heavy throttle use on higher-powered motors drops that to 15 to 25 miles. Yose Power's claimed range of up to 175 km is under ideal conditions with very light pedal assist.
Can you use this battery on a non-ECOTRIC bike? Reviewers have successfully installed it on Rattan and DJBike models by swapping the mounting base. But it requires some mechanical work and careful measurement to confirm dimensional compatibility.
Does the Yose Power 48V 15Ah have a warranty? Yose Power offers customer support through Amazon, and multiple reviewers have praised their responsiveness. They have exchanged batteries when buyers ordered the wrong model. Check the listing for current warranty terms.