Rad Power owners run into a wall the second their stock pack dies. Official replacements sell out, cost a large share of what the bike did, and in some years are not orderable at all. So the third-party market on Amazon does brisk business, and nearly every listing promises the same thing: your bike, running again, for a third of the price.
The fit list matters more than the promise. Four-and-older phrasing in the compatibility bullet leaves out the newer Rad frames, an XT60 connector needs checking against whatever the bike actually uses, and a buyer reading the reviews meets one unverified complaint about a bare connector carrying real current.
What follows is the fit list decoded, the five-rating record with its one loud complaint, the charging and cycle claims set against published norms, and where the price lands per watt-hour.
The ShunTongDa Hailong 48V 14Ah pack sells at 280.99 under model JD-JB0114, and on price per watt-hour it sits among the most expensive of the 301 batteries we track. I'll say that plainly rather than bury it: this is not a bargain pick, and the comparison table shows where it lands against everything else.
The case for it is electrical, not financial. 48 volts, 14Ah, 672 watt-hours, a 30A BMS that works out to about 1440W of continuous output on a fresh pack, and an XT60 discharge connector. That genuinely covers the 500W to 750W motors most Rad Power bikes carry, with headroom.
Three purchase-confirmed owners back the basic promise, and one of them says it replaced the original battery on a Rad City and works.
The case against it is two-fold, and both halves come from the listing itself. The weight on the page cannot be squared with the capacity being sold, and the loudest text in the review record is an unverified one-star about an exposed connector.
Neither is disqualifying on its own. Both belong in the decision.
The weight is the number that does not survive its own arithmetic
The spec table gives this pack a weight of 3.5kg, which is 7.7 pounds, and a capacity of 672 watt-hours. Divide one by the other and the pack works out to about 192 watt-hours per kilogram.
That number deserves a slow read. The arithmetic says the pack works out to about 192 watt-hours per kilogram. The ebikes.ca batteries guide states a complete lithium-ion ebike pack, cells plus BMS plus case plus wiring, runs about 110 watt-hours per kilogram, with lithium polymer pouches topping out near 160.
A rigid Hailong shell full of cylindrical 18650 cells holding 75 percent more energy per kilogram than complete packs normally reach is not a spec you plan around. It's a spec you check.
You can't tell from the outside which figure is off. Either the pack is lighter than physics usually allows at this capacity, or the capacity is smaller than the label says, and the listing gives no third measurement, no cell count, no series-and-parallel layout, that would settle it.
So the practical move is the one the warranty already invites. Meter the pack inside the one-year window: charge it full, run it down on a route you know, and read the watt-hours off a wattmeter or the display's consumption figure. If the capacity is real, the light weight is a bonus. If it isn't, you'll have found out while the warranty still means something.
Which Rad Power bikes it actually fits
The compatibility bullet names RadRunner Plus, RadRover 4 and older, RadCity 4 and older, RadExpand 5 Plus, and the RadWagon line including the RadWagon 4 and 5. Then, in the same breath, it asks the buyer to confirm whether the battery size suits the space in their frame.
Read that phrasing twice, because "4 and older" is doing real work. Rad Power redesigned these bikes over the years, and the newer frames are not claimed by this listing. An owner of a RadRover 6 or a RadCity 5 is outside the list the seller published, whatever the title's promise about Rad Power bikes in general.
Our dichou 48V Rad Power replacement review walks the same fit question model by model, and the pattern there is the same: the year of the frame decides more than the brand on the box.
Physically this is a Hailong shell, 14.96 by 3.5 by 3.74 inches, that mounts on the downtube with the included base. It is not a drop-in for the stock Rad case, which is shaped differently and mounts differently. The battery slides onto the base and locks, with a key, and a power switch sits on the case.
The electrical side ends in an XT60, and that's the other check the listing leaves to you. Rad's stock packs and harnesses have used different connectors across model years, so look at what your bike actually has before ordering. One owner has confirmed the swap works on a Rad City, which is the only fit report the record contains for a named bike.
A five-rating record where the loudest text is unverified
The battery holds 4.1 stars from five ratings: three five-star, one four-star, one one-star, and nothing at all at three or two stars. When I checked, the listing showed only 16 left in stock, so this is a thin, slowly-moving record rather than a verdict.
All three positive texts are purchase-confirmed, which matters, but they're short. One says it's better than the original battery the rider had and the charge lasts longer. Another worked it on a big mountain bike and praises the seller's response and delivery speed.
The four-star, from December 2025, says it replaced the original Rad City battery and works well.
The one-star is the loudest text in the record, and it carries no purchase confirmation. Its complaint is specific: the XT60 connector ships bare, with no weatherproof cap, and the writer calls that a water and fire hazard left as-is, asking the seller to either document the connector type or supply a watertight cap.
Two texts tie at one helpful vote each: that unverified one-star, and the four-star Rad City owner.
The complaint deserves a straight answer rather than a dismissal. An exposed high-current connector on a pack marketed to commuters is a fair thing to flag, and a silicone XT60 cap costs very little, so the fix is on the buyer. What the listing could fix itself is the silence: the page never documents the connector type in detail, which is exactly what the complaint asks for.
Charging, cycles, and range against the norms
Charging starts with a gap. The bullet gives a standard charge current of 54.6V at 2A, but the included-components list names the battery, the base, and keys, and no charger. Check the box manifest before you plan around a charger that may not ship.
If the 2A figure holds, the arithmetic says a 2A charger moves roughly 96 to 109 watts into a 48V pack, so a full fill of 672 watt-hours from empty lands near six to seven hours at minimum. That's an overnight charge, and it's the only charging fact on the page worth planning around, because the LED indicator is the only state-of-charge tool the pack offers.
The cycle claim needs the same treatment. The listing says the battery exceeds 1000 charge cycles. Battery University's BU-808 puts the manufacturer norm for consumer lithium-ion at 300 to 500 full cycles, with shallower discharge stretching the count a great deal.
The claim isn't impossible under light use and partial cycling, but it's presented with nothing behind it, and the one-year warranty is the whole backstop either way.
Range is arithmetic only, because nobody in the record has reported a real number. On the ebikes.ca consumption bands, 672 watt-hours runs about 34 to 48km power-hungry, 56 to 75km with typical pedaling, and 84 to 112km with minimal assist on a 48V bike. Treat those as bands, not promises, and meter your own first ride.
Buy it when the stock pack is dead and the downtube has room
The decision this pack forces is narrow, which makes it easy to state. If your stock Rad battery is dead, the official replacement is unobtainable or absurdly priced, your frame is on the four-and-older list, and there's room on the downtube for a 15-inch shell, this pack puts the bike back on the road for 280.99 and one owner has already confirmed the Rad City swap.
If you want a plug-and-play match for the stock case, this isn't it, and the same-brand ShunTongDa external Rad Power pack we reviewed separately makes a different set of trade-offs worth comparing before you order.
Two conditions ride along with either choice. Buy a silicone XT60 cap with the pack, because the listing won't ship one and the record's only detailed complaint says the connector ships bare. And plan a capacity check inside the one-year window, because the weight arithmetic on this listing doesn't close on its own.
At 280.99 for 672 watt-hours, the value is the weakest part of the pitch, and the comparison table is where that becomes obvious. The electricals are the reason to buy. The price is what you pay for them.
Frequently Asked Questions
Does this physically replace the stock Rad Power battery?
No. It's an external Hailong shell that mounts on the downtube with an included base, not a drop-in for the stock case. Electrically it's a 48V pack with an XT60 discharge, and one owner has confirmed the swap works on a Rad City.
Which Rad Power models does it fit?
The listing claims RadRunner Plus, RadRover 4 and older, RadCity 4 and older, RadExpand 5 Plus, and the RadWagon line. Newer frames aren't claimed, so measure the downtube space and check your model year against that list before ordering.
Is a charger included?
The box list names the battery, the base, and keys, and no charger, even though the bullet gives a 54.6V 2A charge current. Confirm with the seller before ordering, and if you're buying a charger anyway, match the 54.6V full-charge voltage for a 48V pack.
What about the water complaint on the connector?
One unverified owner describes an exposed XT60 with no weatherproof cap and calls it a hazard. A silicone XT60 cap costs little and closes the gap. The listing's own silence on connector type is the part of the complaint that's hardest to argue with.
What range should I expect?
No owner has reported a number, so it's arithmetic: roughly 34 to 48km power-hungry, 56 to 75km with typical assist, and 84 to 112km with minimal assist on the ebikes.ca bands. Meter the pack inside the one-year warranty window and you'll replace those bands with your own figure.