Silver fish batteries are the shape most budget ebikes settled on, which is good news until the original dies and you find out how many packs share that shape. The case stays the same across brands, the capacities inside it do not, and the listing that finally matches your bike may describe three or four different packs at once.
That's the situation with this Yose Power listing. The title sells a 48V 10.4Ah pack, the model number agrees, and Amazon's own spec table describes a 36V 13Ah battery, while one bullet lists every capacity the family comes in.
This review walks through which pack the page actually sells, what its six ratings can and cannot tell you, whether the silver fish shell will fit your bike, and what the watts cost per watt-hour.
This Yose Power silver fish pack is a decent shape married to a listing that cannot say what it sells, because the title and model number describe a 48V 10.4Ah battery while Amazon's own spec table describes a 36V 13Ah one.
The record behind it is two written texts on six ratings, and neither text has earned a single helpful vote. If the pack that arrives matches the title, the arithmetic is ordinary. The risk you can't price is which pack arrives.
The spec table and the title disagree about what this page sells
Count the answers this page gives about its own product. There are four. The title says Yose Power 48V 10.4Ah silver fish, and the model number says AN 48V10.4Ah.
Amazon's spec table says 36 volts and 13 amp-hours, which is a 468Wh battery and a different charger question entirely.
A full 36V pack sits near 42V, a full 48V pack sits near 54.6V. Bullet two skips the argument altogether. It lists the whole family at once, 48V and 36V at 10.4Ah, 13Ah, 15Ah and 17.4Ah, and never says which variant this page ships.
The two answers even disagree by a real margin, because 48 times 10.4 is 499.2Wh and 36 times 13 is 468Wh, a difference of 31 watt-hours between what the title promises and what the spec table describes. Then there are the details that show how carefully the listing was built.
The spec table says this battery requires one AAAA battery, included, and lists its compatible phone models as 5V1A, which is a USB rating and not a bike.
The one answer the page gives consistently is geometry. The bullet says the case is 388 by 110 by 75mm, and the spec table's 2.95 by 4.37 by 15.28 inches is the same case in a different order, so the shell is the one thing you can trust the page on. Compare it against the rest of the field in our battery comparison table.
Six ratings, two texts, and a complaint aimed at Amazon itself
The record is thin, and it's worth being honest about how thin. 3.4 stars from 6 ratings breaks into 46 percent five, 33 percent one, and 21 percent four, with zero 3-star and zero 2-star ratings in between. Only two of those buyers have written anything, both texts carry purchase confirmation, and neither has collected a single helpful vote, so no reader has found either one useful enough to endorse.
The negative text is the stranger of the two, because its target isn't the seller at all.
One owner has reported ordering on Amazon's Alexa recommendation, which suggested this pack would fit a Caroma scooter and make it faster, and found the pack did not fit. That owner returned it. The listing never claims the Caroma, so the complaint lands on the recommendation rather than on anything this page promises.
The positive text, though, agrees with the negative on the real risk. Its whole advice is to make sure you order the right one, because there are so many styles in this family, and that owner kept searching until the right variant turned up. Both texts, from opposite directions, tell you the same thing.
The pack may be fine, and the ordering decision is where the money is lost. What nobody has reported is a range figure, a real charging time, or ownership past two months.
What the silver fish shell demands before you order
Silver fish is a shared shell, and that's the whole reason this listing is confusing. The same outer case has carried many cell counts across many budget brands over the years. The named bikes here are the ECOTRIC Fat Tire Folding, Starfish, Dolphin and Peacedove, and the case measures 388 by 110 by 75mm, with the spec table's inches confirming the same box in a different order.
Your protection is a tape measure and five minutes. Measure the old pack's length, width and thickness, and check the mount rails it sits on. Then compare your measurements against the 388 by 110 by 75mm case rather than against a bike name on a bullet.
Weight is 3.5kg, about 7.7 pounds, which is mid-pack for this format and won't surprise anyone replacing an original silver fish battery.
Range, charging, and what the watts cost here
Range arithmetic depends on which answer you believe, though the two versions land close enough that it doesn't change the decision.
499.2Wh at the roughly 20 watt-hours per mile a full-throttle ride draws is about 25 miles, and the spec table's 468Wh works out to about 23, so the identity crisis costs you a couple of miles either way. Both sit at the bottom of what 48V packs deliver, and pedal assist stretches either one well past that.
Wikipedia's e-bike article describes the same spread the long way: range depends on assist level, hills, speed and the weight of bike and rider.
Charging has one fact and one gap. The bullet promises a full charge in 7 hours and never says which capacity that promise applies to, a strange sentence on a page that lists five capacities. It also never states the charger's output, so the seven-hour claim is the only charging fact you get.
Value is where this pack is weakest, and it deserves plain language. At the price when I checked, it works out to about 40 cents per watt-hour, which puts it among the most expensive of the 301 packs we track.
The live position sits in the specs box on our battery comparison table. That's a below-average value position, not a bargain, and you'd only pay it because the shell matches a bike you already own. The 12-month warranty in the spec table is the real floor, and the bullet's own quality-issue window of 1 month is the part to read twice before you order.
Frequently asked questions
Which pack does this page actually sell?
The title's version wins on evidence: a 48V 10.4Ah pack at 499.2Wh, where the title and the model number agree and the spec table stands alone against both. Check the label on the case when it arrives, and confirm the charger voltage before the first charge.
Will it fit my ECOTRIC?
The listing names the ECOTRIC Fat Tire Folding, Starfish, Dolphin and Peacedove. The case is 388 by 110 by 75mm. Measure the old pack against those numbers before you order, because the shared silver fish shell is exactly why so many near-identical packs exist.
Why did one owner get a bad recommendation?
One owner has reported ordering on Amazon's Alexa suggestion, which claimed the pack would fit a Caroma scooter and make it faster, and found the pack did not fit. The listing never claims the Caroma, so that failure belongs to the recommendation, not to this page.
Is it returnable if it doesn't fit?
Yes, the bullet says the battery is returnable for refunds even though it ships as hazardous goods. The catch is the window, because the bullet handles quality issues within 1 month while the spec table promises 12 months, and the fit-failure text in the record ends in a return.
How far will it go on a charge?
About 25 miles at full throttle by the arithmetic on 499.2Wh, or about 23 on the spec table's 468Wh, with pedal assist taking either version well past that. No owner has reported a range figure, so the arithmetic is all you have, and it's the same arithmetic every 500Wh-class pack here answers to. The 13Ah rung of the same shell family is covered separately. If it isn't the right fit, the battery comparison table sorts every option we track.