You don't need a large pack for every commuter. The Bydrena 48V 10.4Ah is a simple Hailong-style pack intended for short trips. Its lightness is its entire appeal. So far, three customers have given it a perfect 5-star review, which bodes well and is statistically meaningless.
Specs and Value
Its specs are a 48-volt battery with a capacity of 10.4 amp-hours, equating to a total energy content of 499 watt-hours. This is much lower than the 15 amp-hour and 20 amp-hour packs that currently account for the majority of listings. Due to its fewer cells, the smaller footprint on the downtube offers greater flexibility to design around the pack. The battery features an internal, 30A Battery Management System (BMS). A BMS acts as the "brain" of the battery. It monitors temperature, voltage, and current levels to protect the lithium-ion cells from damage due to excessive heat buildup caused by excessive current flow. It accomplishes this through protection mechanisms to prevent short-circuits, over-charging, over-discharge, and over-currents.
BMS and Motor Range
When the BMS fails, the pack also fails. Therefore, it is wise to regard the BMS as the limiting factor of the battery's lifespan.
The seller states that this battery can accommodate motors with ratings ranging from 250 watts to 1000 watts.
Charging Time
With the included 2A charger, charging from completely dead takes approximately five to six hours. Overnight charging will cover that span of time, however, there will be no quick top-up for lunch breaks. The XT60 discharge connector is essentially the industry standard for mid-tier designs. Thus, when choosing adapters or replacement parts for your design, you will have numerous options.
Mounting and Weight
The Hailong-style downtube mounting configuration is probably the most commonly seen characteristic of this battery. As a result of its widespread adoption among Do-It-Yourself builders and aftermarket kits, you should be able to locate matching brackets and mounts for nearly every frame style available online. With the battery positioned along the length of the downtube, it brings the center of gravity closer to the bottom of the frame and immediately above the rear axle. Positioning the battery in this manner will contribute significantly to the overall balance of your ebike and provide better stability relative to larger batteries positioned on a rear-mounted cargo rack.
Additionally, since there is less weight at the higher points on the frame, you will encounter substantially less "tank slapping" while navigating uneven terrain.
The primary benefit associated with a battery of lighter weight such as this 10.4 AH model is that it removes the sensation of carrying a "lead brick" attached to your frame. Large packs ride like they are bolted to the frame. This one enables you to enjoy riding a very agile bike. If you are constructing a lightweight commuter bike and often climb stairs, this weight differential will give you a significant boost in terms of how energetic you feel about climbing those stairs.
Another positive aspect related to this battery is that you have full control over whether electrical energy is utilized. Simply turn off the power switch situated on top of the battery once you have concluded your ride. This feature decreases parasitic drain and minimizes component wear.
Real-World Range and Power
Actual real world range will generally fall below the stated value listed on the packaging label, and will depend upon factors such as terrain, speed, loaded weight, and environmental conditions. At flat speed with a 250W motor, expect suitable range. But if you operate a 1000W motor continuously, then things rapidly deteriorate.
As previously mentioned, this 10.4AH cell count represents the maximum capacity of this pack. This pack is for short-trip commuting only. It is not designed for extended tours or high-intensity mountainous terrain applications.
In addition to offering adequate current surging capabilities to quickly accelerate your ebike from stationary positions, as well as sufficient current flow to maintain reasonable speeds up steep hills, the BMS protects your lithium cells from possible damage that could occur as a direct result of excessive heat buildup created by excessive current flow.
Additionally, by employing separate charging and discharging wiring configurations improves lithium cell protection by enabling monitoring of the charging status of your pack independently of power consumption.
What Amazon Reviewers Are Saying
At present time, this listing has received reviews from only three customers and has earned an average rating of five stars. While three reviews represent substantial evidence regarding customer satisfaction in the form of early praise, they represent little statistical significance.
These initial reviewers seem ecstatically pleased with both the fitment qualities and weight reduction of this particular pack. Nevertheless, I remain concerned about understanding how these cells will perform over extended periods (i.e., several months and/or years of continuous use).
Initially viewed comments are indicative of future commitments rather than established assurances. Although one reviewer may enthusiastically express his/her experience related to the build quality and installation simplicity of the product. based solely on a sample set consisting of mere three responses. no one presently understands whether the BMS will hold up over time.
It looks like an attractive low-risk buy for short-trip commuters today, but reliability data concerning this product is still virtually non-existent.
Who Should Buy This
Individuals living within walking distance to their place of employment and commuting less than ten miles each way daily would likely be happy with this pack. Individuals planning to construct a lightweight project bike using a standard Hailong mount would also appreciate this pack for its minimal weight. Lastly, persons desiring to transport their ebikes into apartments or onto public transportation would also greatly appreciate this pack for its extremely low weight.
Do NOT acquire this pack if you plan to undertake long-distance trips or engage in extreme mountainous biking. Also, Do not use this pack if your motor continually draws more than 30 amps. The BMS will cut power automatically.
This represents specialized equipment designed specifically for one unique task and not as a general-purpose power source.
Review it against others in our ebike battery comparison table or check out the GoMotorbikes blog.
Check the current pricing information on Amazon.
Frequently Asked Questions
What Connector Type Does This Battery Use?
The battery employs an XT60 discharge connector that represents one of the most widely accepted standards for reliable connectors found within the ebike space. If your controller utilizes a connector with a different format designation than XT60, you may obtain an adapter cable to enable compatibility with your system.
How Long Does It Take to Fully Recharge?
Employing a standard 2A charger will allow for recharging from zero volts to full voltage (which represents about five to six hours) . Most riders recharge before hitting empty, so actual charge times usually run generally be less than six hours. Verify that charger was included with your order by checking the sellers listing description.
Will This Battery Fit My Ebike?
Provided your bike has a pre-existing Hailong-style mount installed on the downtube, there is a strong possibility that this battery will fit properly. Dimensions include 14.47 x 3.74 x 3.5 inches and utilizes a 5-pin plate. Measure your available space along the downtube and match it accordingly prior to purchasing.
Can I Charge My Phone From This Battery?
Yes, the Bydrena 10.4Ah incorporates a USB output jack that allows you to charge your mobile device directly from the battery. This is another great option for commuters who require GPS connectivity or wish to maintain their phone's battery life throughout extended riding sessions