Most large 52V batteries require riders to make compromises when it comes to raw capacity and the size of the battery itself. This SEENRONGYUAN 52V 25Ah ebike battery aims to deliver both. While packing 1300 watt-hours of total storage (with a 52V and 25Ah rating), the battery case measures approximately 14.5 x 3.54 x 5 inches (the height being slightly larger due to the presence of a locking mechanism) and weighs approximately 13 lbs. Thus, placing it within a sweet spot for riders seeking substantial range capabilities without adding excessive weight to their bikes. In addition to its size and capacity, the battery offers several unique features such as a key lock and USB charging port that are relatively rare at this price point.
There is one important fact you need to consider going forward. Since this battery is entirely new to the market (only having had one customer review so far), with the reviewer giving it a perfect score of 5.0. that is both good and bad. A completely blank slate means there are no prior horror stories in the review section, however, this also means that no one has accumulated thousands of miles on this particular model. Therefore, you are really gambling on the specification sheet. If the specifications meet your requirements, that is perfectly fine, therefore we will break them down below.
Specifications and Construction Quality
The first specification to highlight is the battery's rating of 52V and 25Ah, thus providing a total of 1300 watt-hours of available energy. To illustrate the magnitude of this figure. a 48V 13Ah battery provides approximately 624 watt-hours, thus doubling the watt-hours provided by this pack. Additionally, based on the pricing per watt-hour, the price per watt-hour is very competitive making it a cost-effective solution to achieving maximum range per dollar.
Specifications list a controller rating of 50A maximum and can accommodate motors ranging from 200W to 2000W. While not lightweight at 13 pounds (or 5.89 kg), the battery's size is quite manageable for a pack of this size.
Within the case are what the manufacturer lists as "Grade-A" Lithium-Ion Cells. Similar to almost every listing on Amazon regarding Lithium-Ion cells, I will view this claim with a healthy dose of skepticism. The quality of construction is what truly matters. The case is water resistant which is a major issue for those riding in inclement weather conditions or washing their bicycles. The battery comes equipped with a six pin base for connecting directly to your bicycle.
Something I find particularly appealing about the packaging content is that you receive the battery, a battery holder, a male xt-60 connector and two keys. Having the XT-60 connector include in the package is a minor advantage since you will not have to search for a connector before you can connect your battery. View current packaging details and check the components on Amazon.
BMS Safety Features and Design
Firstly, I am going to explain something that may cause confusion and I want to provide transparency surrounding this item. The title of the listing states that this battery contains a 50A BMS. However, in the description bullets it states that it has a built-in 40A BMS which protects against overcharging, over-discharging, overcurrent and shorts. These are two different ratings. The reason for this discrepancy could be due to either a typographical error or perhaps newer production units contain different circuit boards. Regardless of why they differ. you should contact the vendor before purchasing this unit if you are using a controller that requires the full 50A output headroom.
Despite this discrepancy. the safety aspect of this battery appears solid on paper. A properly functioning BMS can be the difference between a battery lasting for years or swelling and/or dying prematurely. Protection against overcharge/discharge indicates that this unit has been designed to protect itself during normal operation.
In addition to its safety design. it also has some convenient design elements that differentiate it from many other batteries. Included with this unit is a key operated security lock, which I believe is a great design element for anyone leaving their bicycles parked in public areas and uses their cell phones for navigation. Also included is an LED indicator showing your real-time battery level, eliminating guesswork as to your remaining range. Finally, there is a USB port allowing you to charge your mobile device from the battery. Although this seems like a novelty. once you experience needing to charge your phone during a long ride, you will appreciate this feature greatly. See for yourself on Amazon. Amazon Listing.
Range and Real World Performance
With regard to what 1300Wh actually equates to in terms of actual range. range is primarily determined by your motor, your weight, and whether you ride mostly with assistance or utilize the throttle frequently. Using the previous example of a 750W motor running at full tilt. continuous running would drain this pack in approximately two hours. However, few riders run their motors continuously at full tilt. instead utilizing various levels of pedal assist and throttle application to extend their riding time. Riders generally experience better-than-projected results in actual riding performance compared to pure mathematical calculations.
If you're an avid long distance rider looking to minimize range anxiety. that is exactly where a pack like this excels. Due to the increased capacity of this pack. you will be able to ride significantly longer distances on a single charge than you would with smaller-capacity batteries. Further benefits include reduced charging frequency. resulting in less stress on the cells themselves throughout their lifespan. Unfortunately, due to its size. charging a pack of this nature will take significantly longer than smaller packs and should be planned accordingly.
I should mention that most of my analysis above relies on speculation stemming from the battery's specifications. Since there exists only one review presently. we cannot accurately assess long term reliability/durability of this pack. While I can confidently assert that the capacity math is legitimate and standard lithium ion chemistry. that's as confident as we can be with new products.
Who is This Battery Designed For?
As indicated previously, this battery was specifically designed for riders that desire significant range at an affordable price and don't mind accepting certain trade-offs. If you currently operate a 52V system with an under 50A controller and continually find yourself running low on power mid ride, this pack merits serious consideration. The added security lock and USB ports make it an even better value for commuters who regularly park their bikes outdoors and rely upon their cellular devices for route guidance. Waterproof encasing adds additional value for those willing to expose their bike to regular rain showers. For a full breakdown of how this pack stacks up against the rest of the market, browse the ebike battery comparison table and related review posts.
However, it isn't ideal for everyone. If you require a battery that fits into a specified brand's proprietary mounting bracket, you should verify compatibility between your bike's setup and the 6 pin base connector on this unit. If you plan on using a controller drawing near its peak draw rate of 50A, you will want to clarify the BMS status prior to making any commitments. Similarly, it may not be best suited for individuals requiring evidence-based proof via multiple reviews prior to purchase.
It bears mentioning again that since there are only one review posted currently for this battery. that is fair game. Most battery listings on Amazon have numerous reviews from customers who have utilized these products extensively. whereas this listing has none...yet. I would prefer to be transparent about this vs pretending otherwise. If you are an individual who prefers waiting for products with established history prior to making purchases, then possibly wait for further reviews. If you're satisfied with being an early adopter for obtaining maximum capacity for each dollar spent. then proceed with caution (and potential enthusiasm).
Frequently Asked Questions
How big a motor does this battery work with?
This battery supports 200w motors through 2000w. This is a pretty good range because you could put a small commuter hub motor into it, but also some very strong high speed setups. The issue is going to be making sure your controller is set to 50a (or less) if you plan to run the highest end of this motor.
How far do I expect to go with a 52v 25ah battery?
Your actual range will depend on many things such as. how hard you ride your e-bike, how much you weigh, how steep your route is, and how much you rely on assist versus using the throttle. For example if you have a 750w continuous draw motor then your battery will last under an hour. However if you mix it up (ie - when you don’t need assistance, use your leg power), your range will be better than expected. In general though, this battery has enough juice for a long distance ride and you can expect good mileage.
How do I interpret 1300wh?
1300 wh simply refers to the number of watts per hour of usable stored energy available in the pack. To find the total watt-hours multiply volts x amps (amp-hours). Therefore 52v * 25 ah = 1300 wh. So, essentially, this pack has roughly twice the amount of watt-hours as a typical 48 v 13 ah pack. This is why this pack appeals to people looking for longer distances before needing another charge.
Will the battery include a charger?
Only the battery itself, a battery holder, a male xt-60 connector, and two keys are included in the regular shipment. It appears a charger may be needed to charge your battery either using the charger that came with your current ebike or purchasing a separate compatible 52 volt charger. Check the list for specifics to verify.
Is the battery water proof?
The plastic case around the battery is considered waterproof. This is a great advantage if you ride in wet conditions or wash your ebike frequently. Be aware however that while the case may be waterproof the connectors are still relatively exposed and thus warrant extra caution.
Should I be worried that there's only one review?
Do I have anything to worry about because of this only being reviewed once? It is a legitimate question. The first thing to consider in an example where there was one review (a perfect) on a new item is what you can reference as far as how well the product performs when compared to other products. In short, since there is no history of reviews for a specific product or product line from which to reference, you will likely be basing your decision largely upon the specifications of the product and information provided by the seller through their listing. This presents two possible scenarios. On the positive side, there are no negative reviews against which to compare. However, this also means that there is limited, if any, information available as to whether this particular model of a product has been reliable over time based upon consumer experience. Therefore, if reliability is a concern for you, it may be best to wait until a track record of performance exists. However, if you are comfortable with taking on some risk associated with "early adopter" status and the product meets its stated specifications, then it is certainly worth considering.