The ShunTongDa 48V 17.5Ah is a Reention Dorado style downtube battery with 840Wh of total capacity, and it has a pretty wide range of ebikes it's compatible with including the Aventon Pace 350 and 500, NCM, Magnum i6, Pedego Element, Shengmilo MX03, and lots of GIO branded bikes. That's a lot of bikes for one battery listing, and the Reention Dorado form factor is common enough that compatibility with those frames seems plausible. ShunTongDa ships this from either a US warehouse or China depending on availability, and the full package includes the battery, a base mounting plate with lock, two keys, and a 54.6V charger. At 840Wh this is one of the bigger capacity options available in the Dorado form factor, which makes this a tempting upgrade opportunity for riders who want extended range without switching to a completely different battery style.
What ebike you have matters quite a bit, the Reention Dorado is one of those battery housings that keeps showing up across a bunch of different ebike brands. If you own an Aventon, NCM, or Pedego that already uses this style of battery a direct swap is the intended use case here. ShunTongDa makes this battery available in whole range of capacities from 13Ah all the way up to 30Ah under the same listing and the 17.5Ah version sits in a nice sweet spot between capacity and weight. The 30A BMS and support for motors from 250W to 1000W means it should handle most common 48V ebike setups without the BMS cutting out under load.
Specs and Value
The ShunTongDa 48V 17.5Ah cranks out 840Wh of usable energy (48V x 17.5Ah), which is above average for a Reention Dorado pack. Most Dorado batteries in this price range are between 10Ah and 15Ah, so getting a larger 17.5Ah is a meaningful bump in range for not much more money. The 30A BMS is decent for capacity and should be able to handle sustained loads from 750W and even 1000W motors without tripping protection.
Physical specs
The housing is aluminum alloy, so it's more durable than the plastic housings you sometimes find on budget batteries, and dissipates heat a little bit better too. ShunTongDa lists the dimensions at roughly 458 x 106 x 65mm for the 17.5Ah version. That is the standard Dorado length for Aventon Pace frames and other similar bikes that use the longer Dorado mounting plate. The base plate locks into the downtube mounting points and the battery slides onto the plate and locks with a key. Two keys are included. The aluminum does add a bit of weight over plastic, but for a battery this size that extra rigidity is probably worth it.
BMS and motor range
The 30A continuous BMS takes care of overcharge, overdischarge, overcurrent and short circuit protection. At 48V and 30A, the theoretical max continuous power output is a little more than 1440W, but real world output will be slightly lower due to voltage sag under load. Still, for motors up to 1000W that BMS headroom is plenty to keep things happy. The included charger is rated at 54.6V and either 2A or 3A depending on which version ships. The 2A charger will fully charge a depleted 17.5Ah battery in about 8 to 9 hours, while the 3A version will do it in around 6 hours. The charging temperature range is 0 to 45 degrees Celsius, and for discharge, it's negative 20 to 60 degrees Celsius, so riding in the cold will be within rated spec.
Form Factor and Compatibility
The Reention Dorado is a downtube mounted battery that slides onto a base plate bolted to the bike frame. This is a common form factor for midrange ebikes, and the mounting holes and electrical contacts will, in most cases, be close enough for batteries from different manufacturers to interchange. ShunTongDa lists compatibility with the Aventon Pace 350 and 500 1.0, GIO, Magnum i6, NCM, Shengmilo MX03, and Pedego Element.
That's a broad claim, and it does indeed cover a ton of popular ebike brands. But this is one of those cases where you'll want to double check your specific bike model and year against the battery dimensions and contact layout before ordering. The Dorado form factor has evolved through the years and some of the more recent Aventon or NCM models may use a slightly different mounting configuration. ShunTongDa mentions a 24-hour response time on compatibility questions, so if you're not 100 percent sure, reach out to them with your bike model before ordering. For riders with older Aventon Pace 500 models that originally shipped with a Dorado style battery, the swap should be a bit easier as those bikes were designed around this form factor.
Real-World Range
With 840Wh of capacity, the ShunTongDa 48V 17.5Ah has some serious range potential. Running a 500W motor with pedal assist at low speeds over flat terrain, expect somewhere in the ballpark of 30 to 50 miles per charge depending on rider weight, terrain, wind, and how much you use the throttle. Running a 750W motor with more heavy handed throttle and some hills, expect that range to decrease to maybe 20 to 35 miles. And on a 1000W motor, full throttle on hills, expect something like 15 to 25 miles.
Those are pretty far ahead of most 10Ah or 13Ah packs that come stock on a lot of midrange ebikes. If you have been running out of juice on your daily commute or wanting to stretch the range for longer weekend rides, the 17.5Ah capacity goes a long way towards addressing that concern directly. The 30A BMS also benefits range in an indirect sort of way, since a higher ceiling on discharge refers to less voltage sag due to load, and in turn, the controller can draw from that pack more efficiently through more of the discharge cycle. Check out our comparison table to see how the ShunTongDa 48V 17.5Ah holds up on price per watt-hour against other Dorado style batteries.
What Amazon Reviewers Are Saying
When we last checked, the ShunTongDa 48V 17.5Ah did not have a single verified customer review on Amazon. However, the listing does show a 5.0 rating, which appears to be a default rating with no actual reviews behind it. So there is no real-world feedback to go on yet from people who have bought and installed this battery.
The lack of reviews isn't necessarily a bad sign, ShunTongDa does sell other ebike batteries on Amazon and the Reention Dorado form factor itself is well established. But it does mean you're taking more of a risk on build quality, actual fitment, and customer service than if you bought a Dorado battery with dozens of verified reviews. ShunTongDa shows a 1-month return and refund policy in addition to a 12-month warranty with free repair, which offers at least some baseline protection. If you're okay being an early adopter and want the higher capacity, the specs do look competitive. If you'd rather have the assurance of user feedback, checking out some other reviewed batteries on our comparison table might be worthwhile.
Who Should Buy This
The ShunTongDa 48V 17.5Ah is best for riders who own an Aventon Pace, NCM, Pedego Element, Magnum i6, or another ebike that uses the Reention Dorado downtube battery mounting system. Upgrading to an 840Wh battery is a nice step up from the 10Ah or 13Ah packs that many of these bikes come with out of the box and the BMS is rated for 30A which will work well for a motor up to 1000W. If your riding needs have already outgrown the stock battery, this is a nice plug-and-play upgrade with no frame or wiring changes needed.
Riders who are less comfortable with the zero review history may want to reach out to ShunTongDa directly to confirm fitment for your exact bike model before ordering. The 12-month warranty and 1-month return window offers a little buffer, but there is nothing quite like knowing that other people have successfully installed this same exact battery on the bike you already own. For a look at everything available in the 48V downtube battery category and how these compare on capacity and value, check the comparison table.
Frequently Asked Questions
What ebikes is the ShunTongDa 48V 17.5Ah compatible with? ShunTongDa lists the Aventon Pace 350 and 500 1.0, GIO, Magnum i6, NCM, Shengmilo MX03 and Pedego Element. This battery uses the Reention Dorado downtube mounting system so theoretically any ebike that received a Dorado style battery stock should work. Always check with ShunTongDa to confirm your exact model and year before ordering.
What is the BMS on this battery? 30A on a continuous discharge basis, which gives you about 1440W of theoretical max continuous delivery at 48V. The BMS features overcharge, overdischarge, overcurrent and short circuit protection.
How long does it take to charge the ShunTongDa 48V 17.5Ah? About 6 to 9 hours from empty with the included 54.6V charger that comes with either a 2A or 3A version. ShunTongDa shows both options in the description.
Does this battery come with a mounting plate? Yes, the package comes with the battery, base mounting plate including lock mechanism, two keys and a charger. The base plate bolts onto the downtube of your compatible ebike frame and the battery slides onto this plate and locks into place.
What is the warranty on the ShunTongDa 48V 17.5Ah? 1 month for returns, resend and refund plus 12 months for free repair according to the listing. 24-hour response time on customer service inquiries according to the listing.
Can you use this battery on a 1000W motor? Yes, the BMS supports 250W to 1000W based on the listing. There's a little room with 30A continuous support to handle a long sustained 1000W load without protection triggering.