The Bydrena 48V 10.4Ah is a hailong downtube battery that offers 499 watt-hours of energy in a water-resistant housing. It weighs 9.7 pounds, making it relatively light and affordable compared to other 48V batteries with larger capacities like the 15Ah and 20Ah options. The battery features an LED charge indicator, a USB output port, an XT60 discharge connector, and a 30A BMS. Bydrena rates it for motors between 250W and 1000W, covering the most popular hub motor and mid-drive configurations on the market today.
Bydrena positions this battery as a versatile replacement pack for existing ebikes as well as an option for new conversion builds. The hailong form factor is one of the most common designs in the aftermarket ebike battery space, which allows the Bydrena 48V 10.4Ah to fit most standard frames that already have a downtube mounted battery bracket or mounting points. The 10.4Ah capacity puts it on the smaller end of the 48V spectrum, but that also makes it lighter and more affordable than the larger alternatives.
Specs and Value
The core specifications are 48V nominal and 10.4Ah capacity for a total of 499Wh of stored energy. Overall, 499Wh is enough power for shorter commutes and casual riding, typically under 20 miles per trip. Riders who cover fewer than 20 miles will find that this battery provides plenty of juice without the extra weight and cost of a larger pack.
Physical specs
The battery measures 14.47 x 3.74 x 3.5 inches and weighs 9.7 pounds, which is compact and light for a 48V battery. The hailong form factor mounts along the downtube of the bike frame using a 5-pin base plate and locks into place with the included key. This design allows for easy removal when you want to charge the battery indoors or store it separately from the bike.
One feature that sets the Bydrena 48V 10.4Ah apart from many competitors is the addition of a USB port. This allows you to charge your phone directly from the battery while you ride, which is a nice convenience for commuters who rely on GPS navigation or want to keep their phone topped off during longer trips. The LED indicator shows remaining charge at a glance without needing to power on your bike display, and the water-resistant design allows riders to ride in wet weather without worrying about damaging the battery.
BMS and motor range
The 30A BMS provides short circuit protection, overcharge protection, over-discharge protection, and temperature monitoring. At 30 amps on a 48V system, the maximum theoretical output is 1440 watts, providing plenty of headroom beyond the stated motor compatibility range of 250W to 1000W. The 30A continuous discharge rating means that even a 1000W motor pulling near its maximum will not trip the BMS under normal riding conditions.
The 30A BMS is the industry standard for mid-level ebike batteries. It provides adequate protection for motors up to 1000W, but riders running a motor above 1000W will need a battery with a higher rated BMS. Bydrena also backs this battery with a 12-month warranty, which provides some confidence in the build quality.
Form Factor and Compatibility
The hailong design is arguably the most popular aftermarket ebike battery form factor. It slides onto a mounting plate bolted to the downtube of the bike frame and locks into position with a key. The installation process is straightforward and the battery can be removed in seconds for indoor charging or storage.
The Bydrena 48V 10.4Ah uses a 5-pin base plate which is the standard mounting system for hailong batteries. As long as your controller has an XT60 port and your bike frame has a hailong mounting plate or mounting points, this battery should work properly. The XT60 discharge connector is widely used in the ebike community, so compatibility with most controllers should not be an issue.
Before purchasing, measure the clearance along your downtube to confirm the battery dimensions of 14.47 x 3.74 x 3.5 inches will fit between the tube and any other frame components. Also verify that your controller uses an XT60 connector or that you have the appropriate adapter. The 5-pin base plate should be compatible with most standard hailong mounting brackets, but double check the pin spacing if you are unsure.
Real-World Range
With 499Wh of capacity, the Bydrena 48V 10.4Ah is best suited for shorter rides and daily commutes under 20 miles. On a 500W motor with moderate pedal assist on flat terrain, expect somewhere in the range of 15 to 25 miles per charge. On a 750W or 1000W motor with heavier throttle usage and hilly terrain, that number drops to around 10 to 18 miles. For riders with a short commute of 5 to 10 miles each way, this battery should last a couple of days between charges.
The 10.4Ah capacity is on the smaller side compared to the 15Ah and 20Ah packs that are more common in the 48V category, so riders who need longer range should consider a higher capacity option. But for those who prioritize weight savings and a lower price point over maximum range, the Bydrena 48V 10.4Ah hits a practical sweet spot. Check our comparison table to see how it compares against other 48V batteries on price per watt-hour.
What Amazon Reviewers Are Saying
The Bydrena 48V 10.4Ah has a 5.0 star average based on 3 reviews on Amazon. All three buyers gave the battery a positive rating and were satisfied with its performance.
One reviewer purchased the battery for their spouse's electric bicycle and described it as a very good battery for the bike. Another reviewer noted satisfaction with the battery performance on their ebike setup. The small sample size prevents us from drawing broad conclusions regarding long-term reliability. However, the perfect rating and the positive feedback from buyers who are currently using the battery on their ebikes is encouraging. The 12-month warranty from Bydrena adds a layer of protection for buyers who are cautious about purchasing products from a lesser-known brand.
Who Should Buy This
The Bydrena 48V 10.4Ah is a solid choice for riders who need a compact and affordable 48V replacement battery for shorter commutes and casual riding. The 499Wh capacity is sufficient for most riders who cover fewer than 20 miles per trip, and the 30A BMS offers reliable protection for motors up to 1000W. The USB output is a practical addition that you do not see on every battery in this price range, and the hailong form factor makes it compatible with a wide variety of bike frames.
It works best as a replacement for an existing hailong battery on a commuter ebike or as part of a new conversion build using a 48V hub motor or mid-drive. The XT60 connector and 5-pin base plate are industry standard connections, so compatibility should be straightforward for most setups. Buyers who live in areas where rain is common will find the water-resistant design to be a nice feature. Riders who store their bike outdoors will also find this design to be practical.
If you need more than 20 miles of range per charge or if your motor draws more than 30A, this battery is not the right fit. Those who have longer commutes or use heavy throttle may want to consider a battery with more capacity. But for short-distance riders who want a lighter battery that does not cost as much as the larger capacity options, the Bydrena 48V 10.4Ah is worth considering. Compare it against other options on our battery comparison table.
Frequently Asked Questions
What connector type does the Bydrena 48V 10.4Ah use? The battery uses an XT60 discharge connector, which is one of the most common and reliable connectors in the ebike space. If your controller uses a different connector type, you can purchase an adapter cable to make it work with your setup.
How long does the Bydrena 48V 10.4Ah take to charge? Using a standard 2A charger, expect about 5 to 6 hours for a full charge from empty. Since most riders do not fully drain the battery before recharging, actual charge times will typically be shorter. Check the specific listing to confirm what charger is included.
Will this battery fit my ebike? If your bike already has a hailong style battery mount on the downtube, there is a good chance this battery will fit. The dimensions are 14.47 x 3.74 x 3.5 inches and it uses a 5-pin base plate. Measure your available space along the downtube and verify the pin spacing before ordering.
Can I charge my phone from this battery? Yes. The Bydrena 48V 10.4Ah includes a USB output port that allows you to charge your phone or other USB devices directly from the battery. This is a useful feature for commuters who use GPS apps or want to keep their phone charged during rides.
What motors is this battery compatible with? Bydrena rates this battery for motors from 250W to 1000W with a controller rated current of 30A or less. This covers most standard hub motors and mid-drives used on consumer ebikes including 250W, 350W, 500W, 750W, and 1000W configurations.
Is 10.4Ah enough for my commute? For commutes under 10 miles each way with moderate pedal assist, 10.4Ah at 48V (499Wh) should be sufficient. For longer commutes or heavy throttle use, consider stepping up to a 15Ah or 20Ah battery for more range. The tradeoff with the 10.4Ah is lighter weight and lower cost.