Amazon purchasers have provided more than 48 reviews of the j JOYISI 48V 24Ah battery, giving the product an average rating of 4.4 stars. Based upon what we can tell about the specs of the j JOYISI battery, its headline spec is clearly the 1152Wh of capacity at a price below 400 dollars. As such, we think this represents a great deal of range potential for a rear-rack battery that has been listed as being compatible with motors ranging from 100W to 2000W.
Specifications and Build Quality
The j JOYISI uses a 48V configuration with a 24Ah rating. In addition, the j JOYISI provides 1152Wh of total energy. As such, based on typical estimates of actual range performance, we estimate the j JOYISI will provide approximately 30 to 60 miles of travel distance depending on assist level and terrain. One reviewer stated he and his riding partner completed trips greater than 45 miles on a tandem ebike with a combined rider weight of 365 pounds.
The battery has a durable aluminum case and endcaps constructed of thicker plastic. According to one reviewer, the aluminum case is extremely rugged and should withstand years of service. The tradeoff for the increased durability is added weight. Weighing approximately 10 to 12 pounds, this is heavier than many comparable batteries available today. However, the overall feel and construction quality of the j JOYISI appears robust relative to other products in this class.
A small LED display on the front face of the battery displays charge status in 25% increments through four LEDs. Some reviewers indicated they wish this were displayed as a percentage reading rather than discrete steps. However, this is fairly common in products of this class. Both ends of the battery contain charging ports, one located at each end, allowing you to connect your charger from either direction depending upon your specific bike layout.
BMS and Performance
The j JOYISI contains a 50A BMS (battery management system) with standard protective features including: overcharge cutoff, over-discharge protection, short circuit detection and over-current limitation. A 50A BMS at this price point is quite good. This indicates that the battery will maintain steady-state discharge for continuous operation of 1500W to 2000W motors, which falls directly within the advertised motor compatibility range.
Additionally, the use of XT60 connectors at each end (battery and controller) is practical. These are commonly used throughout the ebike industry, making wiring up a new build or moving this battery into an existing build easy.
What Amazon Reviewers Are Saying
Given the numerous ratings of this product at 4.4 stars, we have identified several trends in the buyer comments.
On the positive side, multiple reviewers commented positively regarding the excellent customer service offered by j JOYISI. One reviewer mentioned that after breaking the rack mounting bar after only two years of service, j JOYISI replaced it for him quickly and at a fair cost. Another commenter mentioned that he thought j JOYISI was "sincere and honest" regarding the rapid response to send a replacement part for a non-critical issue. Finally, yet another reviewer who experienced a failure of his battery received a replacement battery rapidly.
Another area where reviewers consistently praised the product is related to range. A reviewer who used the j JOYISI on a Pedego tandem reported that he achieved over 45 miles while still having sufficient power remaining. Another reviewer estimated that he could achieve over 70 miles by combining the j JOYISI with an additional battery mounted to the frame.
The negative comments tend to cluster around issues with the included rack. One reviewer described the rack as "made from weak metal" that failed after less than a month due to normal road conditions. Several reviewers chose to drill their own mounting holes or install an aftermarket rack to address these concerns. The rack hardware did not seem to meet expectations for quality relative to the rest of the battery product.
Finally, one reviewer expressed concern regarding safety associated with the design of the charging port. He stated that during connection, the port can generate sparks. He stated that otherwise he felt that the battery was excellent but believed that the charging port design should be re-evaluated for better safety.
Who Is This Battery For?
We think this product would best suit a commuter who travels long distances on a regular basis, tandem riders who require significant range, and individuals who are creating an ebike with a motor larger than 1500W and need to achieve ranges beyond those typically seen with lower-powered ebikes. Additionally, the fact that multiple reviewers have demonstrated positive interactions with j JOYISI's US-based support team suggests that customers will receive prompt assistance if they encounter difficulties.
Finally, given its large capacity, we believe that this product would pair well with another battery to maximize range for extreme-range applications. One reviewer cited achieving over 70 miles using a combination of this battery and a frame-mounted battery.
See the entire list of high-capacity 48V ebike battery comparisons here.
You can check the current price and read recent Amazon reviews for yourself here to see if there are any promotions or user commentary relevant to your purchasing decision.
Frequently Asked Questions
What size motor is this battery capable of supporting?
According to j JOYISI specifications, the battery is capable of supporting motors ranging from 100W to 2000W. The inclusion of a 50A BMS allows for continued operation under full-throttle conditions for motors between 1500W and 2000W.
Does this product include a mounting rack?
Yes, it includes a standard rear-rack mounting bracket. However, several reviewers have criticized the included rack as being poorly constructed. One reviewer described it as "weak metal" that failed after just a month due to normal road conditions. Therefore, it might be advisable to substitute an aftermarket rack that is more robust for heavy usage. Check our ebike battery blog for mounting tips and recommended racks.
Can I charge my battery from both sides?
Yes, both ends of the battery have charging ports. Therefore, you can charge your battery from either side. Please note that connecting both ends simultaneously is not advised unless you have a charger specifically designed for simultaneous input from both ends.
What connectors does this product use?
Both ends (controller side and battery side) utilize XT60 connectors. This connector type is widely used in the ebike community. Thus, integrating this product into your build or system should be relatively straightforward.
Has j JOYISI support been responsive?
From what we have gathered from Amazon review comments regarding support experience from j JOYISI, yes. Multiple owners with over two years of ownership experience have reported positive interactions with j JOYISI's US-based support staff. All reported receiving replacement parts or quick responses to their questions.
How heavy is this product?
Approximately 10 to 12 pounds. The added strength afforded by aluminum casings weighs significantly more than plastic enclosures at equivalent capacities.