The Joyisi 48V 15Ah ebike battery packs 720wh into a rear rack-mount design that keeps your frame clean and your center of gravity low. At 48v with a 30A max discharge, it handles 100W to 1000W motors and covers most Commuter and cargo setups. You get UL 2271 certification, a built-in 30A bms, and an Anderson connector that makes swapping batteries between bikes really easy. The downside is the charger included in the box is a meager 100w 54.6V 2a unit. That means an eight plus hour full charge. If you're okay with waiting, this is your battery. check the current price on amazon.
The Joyisi 48V 15Ah has been placed squarely in the middle of the ebike universe. It's neither the largest Capacity nor the least expensive 48v ebike battery. What it does best is put all those things together – Capacity, Safety certification, and rack mount convenience – in one aluminum shell. Since it comes with its own rack, you won't have to search for a suitable mounting carrier. Since it has an Anderson connector, it is completely agnostic to how you choose to connect your motor(s). So whether you're putting together a Commuter e-bike or converting a normal bike, the Joyisi 48V 15Ah is definitely worth serious consideration before you spend money elsewhere.
Specs and Build Quality
That's what's inside that aluminum body:
- nominal Voltage: 48 v dc
- full charge nominal Voltage: 54.6 v dc
- Capacity: 15 ah
- maximum discharge current: 30 a
- motor compatibility: compatible with 100 w to 1000 w (Bafang, etc.) motors.
- connectors: Anderson powerpole connector
- charger included: yes. 54.6 v dc. 2 amp. wall adapter
- charge cycle time: full charge approximately 8 hours (with supplied charger). faster using other chargers (e.g., anker powerport).
- shells and mounts: made of aluminum. rear mounted via provided rack.
- wheel compatibility: suitable for bicycles with 24", 26" or 28" diameter tires
- Safety certifications: UL 2271 certified
- warranty information: one-year warranty
- customer Support contact information: available by email and phone. u.s.-based customer service team. one key benefit is the rear-rack-mounted form factor. Most battery manufacturers assume you'll attach a tube-mounted pack to your downtube or seatpost. Instead, Joyisi integrates the battery into the same rear rack carrier as the battery. As a result, there are no visible brackets attached to your frame. Weight is therefore located behind your rear wheel rather than ahead of your front wheel. That results in better overall stability than a front-mounted battery setup. The aluminum shell seems sturdy enough for the price point. It doesn't appear to be precision cnc-machined like an aerospace-grade part. However, it appears to provide adequate heat dissipation while protecting against road debris. The Anderson connector represents a major advantage in terms of flexibility. Swapping batteries between bikes with Anderson connectors can now be done within seconds without having to use any additional wiring or crimping new connectors onto your existing wiring. The included 2 amp charger is likely to be the biggest drawback in the specifications. With an included charger capable of supplying only 2 amps on a battery with a total Capacity of 15 ah, charging times will be lengthy. Charging an empty battery to full could take longer than eight hours depending on your specific usage patterns and preferences. That's perfectly fine if you plan on letting the battery sit overnight prior to leaving again for work or school. But if you require rapid recharge capabilities between trips, you may wish to consider purchasing a more powerful charger to serve as a potential upgrade option.
BMS, Safety, and Certification
As previously stated, the Joyisi 48V 15Ah receives UL 2271 certification and that's arguably the most significant specification listed here. UL 2271 is a third party Safety testing program that evaluates lithium ion battery performance for electric rideable devices regarding overcharge protection, short circuit protection and thermal runaway prevention among other things. As such, Safety certification is not optional in this industry, but rather mandatory due to ongoing problems of counterfeit batteries causing fires.
Internally, the pack features a built-in 30A bms that manages cell balancing, prevents excessive discharging, protects against over-charging and monitors temperature levels. The maximum discharge rating of the bms is set at 30 amps which means that you can safely pair this battery with motors of up to 1000w without the bms cutting power during peak acceleration periods.
If you've got a motor with a continuous power output of anywhere between 700w to 1000w then your average peak power draw will be somewhere between 20amps to 22amps (assuming you're drawing near-maximum amounts of power). Given that the bms' maximum discharge rating is 30amps, there is sufficient "headroom" available to prevent premature shutdown during high-draw applications.
The green-red charge indicator light on the battery case simply turns red while charging and turns green after the battery has completed charging. While simple, i highly recommend verifying that this indicator behaves as expected versus an actual charge cycle to confirm reliability. Misleading indicators on lithium-ion packs are a Safety hazard.
What Amazon Reviewers Are Saying
Amazon reviewers have given the Joyisi 48V 15Ah an average rating of 4.4 stars based upon reviews from 144 customers. Based upon these ratings alone, it is safe to say that this product falls well within the upper echelon of universally applicable ebike batteries. Below are some common themes found throughout the reviewer comments:
convenience associated with mounting the battery was perhaps the greatest area of consensus amongst reviewers. They all appreciated that the battery itself came complete with a rear rack which can easily be mounted to your bike. Once attached, removing or attaching the battery merely requires sliding it onto/off of the rack and tightening/loosening the mounting screws. Most reviewers indicated that installation typically took less than thirty minutes utilizing basic hand tools.
Anderson connector allows for easy swapping was another common theme among reviewers who utilize multiple bikes or desire a backup pack. According to these reviewers, swapping batteries between bikes is relatively simple since all that is required is connecting/disconnecting both the positive (+) and negative (-) wires at each end of the Anderson connector.
Weight was felt by many reviewers as being excessive. Although reviewers noted that they did feel the Weight of the battery when standing still or traveling slowly, nearly all reviewers agreed that once they reached cruising speeds (typically greater than 18mph), they hardly noticed the Weight of the battery.
reviewers complained about the slow charger. More than half of the reviewers expressed frustration with respect to how long it takes to charge the battery. Specifically, nearly all reviewers commented on how long it took for their supplied charger (approximately 2 amps) to fully charge their empty pack (which had a total Capacity of approximately fifteen amps). Reviewers noted that an additional charger was necessary in order to achieve quicker charging cycles.
most reviewers were pleased with Build quality for the price, though some noted that the indicator lights were dimmer than they preferred.
If you need quick recharges (i.e., less than an hour), then this isn't your battery. Additionally, unless your particular frame configuration supports attachment of a rear rack (via mounting hardware), this battery cannot be used with your bicycle.
Want to see how this pack stacks up against other options? The ebike battery comparison table sorts every pack we track by cost per watt-hour, and the blog has more replacement battery guides.
Frequently Asked Questions
Common questions about the rack-mount setup, answered.
Will the Joyisi 48V 15Ah Ebike Battery Fit My Bicycle?
The battery fits on a rear rack that attaches to your bicycle's rear dropouts. Therefore, regardless of whether your bicycle has twenty-four inch, twenty-six inch or twenty-eight inch diameter tires, this battery will work for you. Provided that your motor control system utilizes an Anderson connector (the majority do), then this battery will be compatible with your motor control system as well.
How Long Will It Take To Charge My Joyisi Ebike Battery?
With your supplied charger (two amps), you should anticipate it taking approximately eight hours to charge your empty Joyisi ebike battery from zero percent (empty) to one hundred percent (fully charged). If you acquire a faster charger (four amps or five amps), your charging time should decrease accordingly (to four hours, for example).
Which Motors Is the Joyisi 48V 15Ah Compatible With?
The Joyisi ebike battery is compatible with motors ranging from one hundred watts to one thousand watts. Therefore, if you possess any type of Bafang motor (or similar) motor or any type of fifty-five volt dc-powered hub motor kit (up to one thousand watts), then this Joyisi ebike battery will function properly with them.
Does the Joyisi Ebike Battery Include A Rack?
Yes! Your supplied Joyisi ebike battery comes complete with a rear rack carrier which you can attach to your rear frame dropouts and place your Joyisi ebike battery in afterwards. You don't need to obtain another rack.
Has this Joyisi Ebike Battery Received Any Safety Certifications?
Yes! The Joyisi ebike battery has been tested for compliance with UL 2271 standards for Safety for electric rideable vehicles.