A dead XH370-10J or ZL1010-F pack used to mean hunting through discontinued listings. The Yose Power 36V 17.4Ah silver fish ebike battery is the solution to that with 626Wh of capacity in a casing that fits inside the frame. It’s one of the last silver fish packs available by Yose Power at this size. Just make sure to check your mount type before ordering, because even a close call can turn into a paperweight.
Specs and Value
According to specs the pack has a total capacity of 626Wh when configured as 36V and 17.4Ah. That will give most commuters enough juice to ride about 20 miles without needing to stop and recharge. Now watch the wattage claims. The listing claims the pack handles motors up to 900W, but the spec bullets say 700W.
Assume 700W is your realistic limit. Use a motor of greater than 700W through tough terrain and you'll put undue pressure on the cells. The 10A continuous discharge rate says the same thing: short bursts are fine, sustained high draw is not what this pack is for.
The included 42V 3A charger takes approximately eight hours to fully recharge (from completely empty), Check the current Yose Power price on Amazon. With that eight-hour window, you're planning your charging sessions around your day. The side-mounted LED gauge will let you quickly see how much charge is left in the pack, and there is a power saving switch that will cut off the trickle current to prevent draining the pack when the bike sits idle for months.
The Silver Fish Mounting System
Silver fish mounts come in two styles, XH370-10J and ZL1010-F, and this pack fits only those. It is not universal. Check that your frame has one of those two styles of mounts before purchasing, and double-check that the dimensions of the bracket match the dimensions of your existing battery.
Because a silver fish pack hides inside the frame triangle, you get a lower center of gravity than an external box on a rear rack.
An equivalent model of a 48V version is available on the Yose Power website, and the 36V version is [available on Amazon] (https://www.amazon.com/dp/B0GLP2HMQ5?tag=gd053b-20) clearly they understand this form factor very well. However, this 36V model will only work in systems that operate at a low voltage (36 volts) and are limited to motor controllers that can safely control such low voltages.
Physical fit is what matters most. A difference of less than a millimeter renders the pack useless regardless of whether you achieve full capacity. Once secured via the lock on each mount, these mounts hold the pack firmly in place during rugged road conditions.
Real-World Range and Power
This pack is said to maintain a constant voltage throughout its discharge cycle according to the specs. While that may seem like no big deal, maintaining a constant voltage throughout the life of the pack means that your bike won’t lose speed due to sagging voltage as you deplete the pack, especially when climbing long grades.
Yose Power claims a whopping 78% capacity retention after 700 cycles. While that sounds good, there isn't much to go on regarding real-world performance. There is only one review posted for this product. If it really does hold up that well, that would mean daily riding puts you near two years before degradation becomes noticeable, which is respectable for a budget replacement pack.
The amount of range you’ll get depends heavily upon your build specifics. Commuters who use bikes weighing roughly 40 pounds with motors ranging from 350W to 500W and light-to-moderate pedaling should see ranges of between 25 to 45 miles per charge based on mostly flat terrain. On the other hand, if you’ve got a heavier bike (60+ lbs) with a higher powered motor (800W+) and/or consistently use heavy throttle, you might find yourself getting only about 18 miles on average.
Those numbers are comparable with what we've seen in actual testing of similarly sized packs (approximately 600wh) on similarly sized commuter builds.
What Amazon Reviewers Are Saying
At present, Amazon lists only one customer review, and it is one star. A single bad review raises red flags about possible issues with quality. Yose Power has received many positive reviews on multiple different products/equipment from various reviewers on their webstore. Thus while one reviewer had issues with their purchase, it doesn't necessarily represent the overall experience. Test the pack immediately once it arrives and prior to permanently attaching it to your bicycle. Issues related to poor fitment are far more common than issues with cell longevity.
Since shipping is free, returning a heavy item can cost money. Double-check everything before placing an order. Measure twice, because sending a heavy battery back is its own punishment.
Who Should Buy This
Buy this pack if your bike runs a 36V system with a motor drawing 700W or less, you want the battery hidden inside the frame, and you value consistent output over peak numbers.
Skip it if you regularly pull more than 700W, need a full charge in under three hours, or are not certain which mount your frame uses. Running 48 volts? Yose Power sells the version you need on their own site.
Add this pack to the list of ebike batteries in our ebike battery comparison chart, or search through gomotorbikes blog for information on brand history: official site for Yose Power .
Check the latest price on Amazon.
Frequently Asked Questions
Will This Battery Fit My Bike?
Yes, only if your frame takes an XH370-10J or ZL1010-F type silver fish case and your connector fits in the discharge port. Compare measurements of both cases and your old battery before making an online purchase. Measured dimensions found in listings supersede claims made in titles.
Why Does the Listing Say Both 900W and 700W Motors?
There are conflicting statements in terms of motor watts claimed by this listing. The listing states that this pack supports up to 900W motors, but the spec bullets list max supported motor watts as 700W. It is a listing mistake, not a feature. Treat 700W as the ceiling. Assume nothing higher until Yose Power clears things up and size your controller accordingly.
What Does the Warranty Look Like?
It appears there isn’t any specific statement claiming warranty length in this listing. Since Yose Power manages customer support through their store, reach out to them prior to completing an order if warranty length concerns you. Keep your order number handy either way.
How Do I Verify Capacity When the Pack Arrives?
To determine true capacity when your pack arrives: charge it fully, record where the charger stops, then ride your usual route and watch the gauge. Healthy packs should provide similar mileage as your previous pack for several initial trips. Packs that rapidly fall-off during initial use or drop below 20% charge when stopped indicate that it should probably be returned.
Is Silver Fish the Same as Downtube Mounting?
No. Silver fish packs slide into a bracket mounted on the frame, usually on the seat tube or downtube. A bottle-style pack bolts directly to the frame bosses. The connectors and holders are not interchangeable, so match your original style.
That lower center of mass improves stability during cornering, improved traction during acceleration/deceleration (especially uphill/downhill), reduced weight distribution unevenness when loaded/unloaded, etc…