You could go with a 1040 wh pack using LG 5000 cells and a 50 A BMS for under 300 dollars. That sounds too good to be true. I have seen people say that they really liked that idea and the Joyisi 52V 20Ah battery fits the bill. On paper the Joyisi seems to be a major improvement over the budget packs we all started with. The question is, can the real product live up to the cost. From what I am seeing, buyers who have purchased the Joyisi seem to believe it does, and the battery currently sits at 4.6 stars.
Specs and Build Quality
The big number is obviously exciting. That is a 52 V battery rated at 20 Ah (which equates to approximately 1040 Wh). Do the math yourself if you'd like to verify that. To determine watt-hours simply multiply volts x amps = wh, therefore 52 x 20 = 1040. That is a fairly substantial number for a single pack and that equates to considerable range for almost all mid drive and hub builds.
The cells are where this battery stands alone from the typical generic Chinese packs available. Joyisi lists LG 5000 cells for this battery and the name of the cell manufacturer is very important for two reasons. First, LG is a tier one manufacturer with a proven history in the EV and power tool industries. Secondly, name-brand cells generally maintain their voltage better while loaded and degrade more evenly than generic cells that typically have exaggerated ratings. Given that a battery is mounted on a frame and vibrated throughout a ride, it's a worthwhile expense to pay for this type of reliability.
If these specifications look right for your build then the Joyisi 52V 20Ah pack is the one you are considering. The shell is a hard black plastic casing versus the soft-wrapped packs found in many of the budget options. Hard shells protect the cells from road debris, minor scratches and the abuse an ebike battery receives. Additionally, there is a four-bar LED display showing battery level located on the upper portion of the casing allowing you to view remaining charge at-a-glance without needing to pull out your meter. Although it may seem like a small item, it is truly helpful during extended rides.
XT60 connectors are used by Joyisi and represent the industry-standard for most ebike builders. Therefore, unless your controller utilizes a different type of connector, you can easily swap-out this pack into nearly any existing build.
Included with purchase is a 58.8V / 3A charger which is suitable-sized for this large pack size. Since charging a 20Ah battery at 3A represents a low load rate for the cells, you're likely helping to prolong the life of your battery by maintaining cell balance over the long-term.
BMS, Safety, and Design Features
Protection boards are the unsung heroes of any quality ebike battery. Joyisi did not skim on this aspect of the product. A 50A BMS is shipped with each Joyisi battery to protect against overcharging, over-discharging, over-current conditions and short circuits. In a 52V system such as yours, having a 50A-rated BMS is critical since it enables the battery to supply power to your controller when it requires additional juice without shutting down due to excessive load requirements.
A lesser-costed battery with poor-quality BMS will shut-down when you need it most, for example when you're pinned against the throttle on a steep incline. The Joyisi BMS supplies continuous current up-to its rated limit of 50A, thus providing sufficient headroom for motors ranging in power output from 100W to 1900W. Regardless of whether you're utilizing a small geared-hub or a larger direct-drive motor, the pack will support both.
Safety features appear robust as well. As previously mentioned, this ebike battery carries UL 2271 certification. While this may seem insignificant, UL 2271 certification involves actual testing for abuse, thermal runaway and electrical safety. Having UL 2271 certification on an affordable ebike battery such as this is comforting, particularly compared to inexpensive packs lacking even minimalized safety standards.
The design completes the offering by featuring a clean black-hard-plastic shell and an LED battery-level indicator above it. All aspects of this design are created with the commuter who desires dependability rather than another project requiring constant maintenance in mind.
What Amazon Reviewers Are Saying
In the end, real-world feedback confirms either the published specifications or negates them entirely. Positive feedback has been overwhelmingly expressed within the reviews section regarding this Joyisi ebike battery. Among the first-hand accounts one enthusiastic reviewer stated "grade-a battery!!!" and claimed his Joyisi delivered a maximum speed of 50 mph on a 52-volt 2000-watt build. That clearly establishes credibility in terms of high-power configurations for potential customers.
Value appears to be another area receiving praise. Another buyer concisely summarized his experience stating "so far so great!" and went on to point out this battery provided better pricing than comparable alternatives priced at 200 to 300 dollars more.
As expected, there exists an honest caveat buried within multiple reviews that should be restated prior to making any purchases. One reviewer offered "you'll probably need to connect your own wires." Essentially he explained that you might need to solder or acquire an adapter dependent upon your present wiring configuration. Thusly, it is essential that you measure your present battery compartment prior to placing your order if you plan to use this pack.
Not all reviews were completely positive. A 3-star reviewer indicated "i don't think it's a true 20aH capacity" and he also stated that he had utilized an older model (18Ah) for longer periods of time. This should be taken seriously, however it represents only one review among many favorable ones. Conversely, a 5-star reviewer praised the charger stating "charger is way better than the one supplied with Unitpackpower."
Overall, this is an ebike battery delivering on both power and value for most buyers, although as previously stated there exist common caveats associated with both wiring and real-world capacity issues inherent in virtually all products sold at this price point.
Who Is This Battery For?
The Joyisi is an ideal choice for the rider desiring to replace their worn-out ebike battery and achieve genuine range without paying premium prices. If your current battery sagged under load or depleted quickly during a commute, this provides significant upgrades. The LG cells and 50A BMS provide improved performance characteristics for moderately-high powered builds which may cause a cheaper pack to choke.
Additionally, it is suitable for high-powered builds (based on what reviewers have reported), particularly if you desire an ebike battery capable of supporting high amounts of power. Furthermore, since Joyisi has selected an XT60 connector, you can easily transition this pack into most existing builds, assuming you are willing to complete the required wiring work.
If you are shopping and wish to compare how this 52-volt pack compares against competitors at various voltages and formats, please reference our comparison chart. For additional general information pertaining to purchasing ebike batteries and more specific knowledge related to various types of batteries, please visit our blog. This is a highly competitive option among best 52-volt ebike batteries for the money.
Frequently Asked Questions
Will the Joyisi 52V 20Ah battery provide me sufficient range?
Depending greatly on your motor type, terrain and how aggressively you ride, you can anticipate a reasonable amount of commuting distance or recreational time per charge. Based on a total rating of 1040Wh, most riders can anticipate an extended period of time regardless of their individual circumstances.
Will this battery fit my bike?
Whether or not this battery will fit depends greatly on your frame type and your existing wiring configuration. The Joyisi uses XT60 connectors, thusly this battery should drop into most existing builds that utilize XT60 unless otherwise specified by your builder. However, according to several reviewers, you may require welding or purchase an adapter in order to connect your existing wiring configuration properly, dependent upon your particular situation.
Which motors can be used with this battery?
According to Joyisi documentation, this battery supports motors in the range of 100W to 1900W. As mentioned earlier, the inclusion of a 50A BMS provides sufficient head-room for moderately-high powered controllers, and as per reports from reviewers, solid results have been achieved on high-power configurations (for example a 52-volt 2000-watt build).
What kind of warranty and support is included?
A one-year warranty is provided with purchase, along with technical support from the USA. While somewhat redundant, this is still considerably more beneficial than many manufacturers that sell budget-priced units with virtually zero post-sale service assistance, thereby providing comfort for consumers looking to place orders.
How long will it take to charge?
Since the included charger is set at 58.8 volts / 3 amperes, charging will be accomplished in just a couple of hours for this large-capacity pack. Using a relatively slow charging rate (in relation to pack capacity) helps prevent degradation of cells over time, maintaining cell balance for prolonged usage.