Official Rad Power replacement packs are expensive and often hard to actually buy, which is why this ShunTongDa Hailong 48V 14Ah exists: 672Wh in a Hailong case that speaks the right voltage and connector language. The catch list is short but real. It does not match the stock form factor, you will likely need an XT60 adapter, and 3.4 stars across 3 reviews is a thin sample. Buy it for the electricals and the price, not the looks.
Specs and Value
The description lists that this is a 48V 14Ah system that has an energy rating of 672Wh. This makes for good trip length, so you shouldn't be stuck on a ride. As well, since it's built with 18650 cells, it should last for about three to four years of daily use before its energy storage capacity starts to fade. The 30A BMS provides a constant current output of 1440W. Since most ebike motors fall under the 750W motor range, you will never have to worry about the battery failing while you're riding uphill at full speed.
This battery also weighs less than many other batteries in the same class, weighing in at just 7.7 pounds. Since this battery is lighter, your bicycle will feel much more nimble and less heavy when you need to carry it up the stairs. The 54.6V 2A charger included with the system will take approximately 5 to 7 hours to fully charge the system. While there may be situations when you'll need to quickly recharge the system (i.e., when going on a short business trip), buying a faster charger would be a worthwhile investment.
The Hailong Mounting System and Compatibility
You can't simply bolt this pack into any frame that has an internal battery - you'll also need to have room on your downtube for the metal bracket to attach.
The compatible frames (in terms of electric specifications) include the RadRunner+, RadRover 4, RadCity 4, RadExpand 5+ and all RadWagon models. but they don't necessarily match up physically.
Because Rad Power doesn't natively use XT60 connectors, you'll probably be using some sort of adapter cable to make it work. So, please make sure to check your frame's clearance before placing an order. If the frame is close-fitting, there may be no way to properly install the bracket.
The bracket itself is constructed out of heavy-duty metal. It attaches to your frame via hardware. After securing the bracket to your frame, the battery fits directly onto rails and clicks in place.
In addition to protecting against theft when you're shopping or running errands, the key lock provides additional peace-of-mind compared to lower-cost third-party battery solutions that generally lack a locking mechanism.
Real-World Range and Power
The listing states that this product should be able to provide approximately 20 to 35 miles of range under moderate pedaling with assistance. When using the throttle alone (or going up big hills), the range would drop to 12 to 22 miles. This type of range is common for a 14Ah battery at this voltage. If you decide to run this battery in addition to your other battery, you may be able to effectively double your overall range. As such, this battery system is ideal for those long trips into work when there aren't any nearby charging stations.
Due to its built-in Battery Management System (BMS), the power output is consistent. the BMS provides protection against overcharging/over-discharging, short circuiting and excessive heat. With a BMS installed, the individual cell(s) will remain protected from potential failure and/or becoming hazardous. The 1440W continuous rating ensures the motor gets enough current for rapid torque when you twist the throttle hard. Many lower cost batteries will experience a voltage drop due to excessive power demand which will limit their performance during high torque applications. This unit doesn't seem to have this problem.
Since the voltage remains higher for a longer period when the battery is fully charged, the motor will maintain its torque and therefore allow for better climbing and acceleration. Even after the battery is nearly depleted, you'll notice the bike feels consistent and predictable. There's also a small LED light on the back of the battery pack that indicates when the battery level reaches low. however, the Rad Power display may not indicate what percentage of charge remaining in the battery.
What Amazon Reviewers Are Saying
Three reviews and a 3.4 star average is a thin record, so read it as early signal, not a verdict. One 5-star buyer called it a great battery with good service and fast delivery. One 4-star buyer said it simply replaces the original and works well.
The 1-star review carries the useful detail: the XT60 connector ships without a weatherproof cap, leaving the connection exposed to rain. That is a fair complaint, and ShunTongDa should include one. The fix costs almost nothing: a silicone XT60 cap keeps moisture out of the connection. For a battery marketed to Rad Power riders, many of whom commute in wet climates, the omission matters more than it sounds.
The broader context helps: ShunTongDa holds a 4.9 star average across its Lectric XP replacement line, so the brand knows how to build drop-in packs. This Hailong unit just does not have the review volume yet to prove itself the same way.
Who Should Buy This
Buy this pack if you are comfortable with a bracket, an adapter cable, and a battery that looks nothing like the stock Rad unit. It suits two riders specifically: the owner of a dead pack who wants the bike back at a fraction of official replacement cost, and the rider adding a second battery for range, where the external Hailong mount is actually an advantage.
Skip it if you want a plug-and-play match for your integrated Rad battery, or if your downtube has no room for the bracket. The XT60 adapter is not optional for most installs, and the weather cap is on you. If those trade-offs work, the electrical specs and the 672Wh price-per-watt-hour make it competitive.
The bottom line: electrically sound, physically foreign. If the bracket-and-adapter path does not scare you, this is one of the cheapest ways back on the road for a Rad Power bike. Compare price per watt-hour across every option on our battery comparison table, and browse the blog for more replacement guides.
Frequently Asked Questions
Is this a physical replacement for the original Rad power battery?
No. This is an external Hailong style battery pack which will be mounted to the downtube using the provided bracket. Although electrically equivalent (48V, XT60) they are different in terms of their design/shape.
Which Rad Power models will this work on?
RadRunner Plus, RadRover 4 & Older, RadCity 4 & Older, RadExpand 5 +, RadWagon series. Before purchasing confirm your connector style and whether there is sufficient space for the bracket on your frame.
Does the kit include a charger?
YES. The complete kit includes the battery, a 54.6V 2A charger, the mounting bracket and base, and 2 keys. Charging time is approximately 5 to 7 hours when charged from completely dead.
What is the concern about the XT60 connector?
An individual noted that no protective cover was shipped over the XT60 connector so it would be open to rain. An inexpensive solution is a silicon XT60 protective cap.
Will this work as a second battery?
Yes. And it is probably the most desirable application. Because the downtube mounting bracket is completely separate from your existing battery you could have both battery packs riding at the same time for longer ranges.
How heavy is it?
7.7 pounds, one of the lightest 48V 14Ah packs available. The Hailong housing keeps weight down compared to bulkier integrated designs.