The annesc 36V 20Ah battery has a number of advantages over most of the other batteries in the 36V 20Ah category. The 40A BMS continuous rating and 80A peak rating is better than what you typically find on competing products. The inclusion of a high-quality XT60 connector is another advantage, as XT60 connectors are very well suited for the type of applications that are most likely to use this battery, and they have a broad availability of adapters and replacement parts. At 720Wh for a competitive price, it is on paper a capable pack. The catch is that this product has zero Amazon reviews so far.
Zero reviews does not automatically mean the product is bad, but the lack of reviews means you are going in without any user data to validate the spec claims. That is a meaningful difference from buying something with 50 verified purchases behind it.
Specs and Feature Set
The basics are 36V nominal, 20Ah capacity, and 720 watt-hours. That is a decent capacity for a 36V pack, considerably more than the 540Wh of a 15Ah option without jumping all the way to 48V. The 40A BMS continuous rating is better than the 30A you see on most competing 36V 20Ah packs, and the 80A peak rating gives significant headroom for motors that spike on acceleration.
Physical specs
Dimensions are 14.5 x 3.74 x 5.43 inches. The 2A fast charger is included, which will take around 10 hours from empty on a 20Ah pack. Despite the "fast charger" label, 2A is not particularly fast for 20Ah. A third-party 5A charger cuts that time significantly but needs to be matched to 36V lithium-ion chemistry (42V full charge).
The XT60 connector is a strong choice for this application. XT60 connectors are commonly used throughout the DIY ebike community and RC communities and are readily available for adapters and replacements. That broad availability makes it a better default than proprietary plugs that require sourcing specific adapters.
Features that stand out
The inclusion of a USB port allows you to charge your phone and other USB devices from the battery itself. Additionally, the inclusion of an LED indicator allows you to determine the charge level of the battery quickly and easily without having to hook up to a charger or display. Lastly, the locking mechanism on the case of the battery makes it easy to carry the battery around securely and protects the battery from casual theft. These are quality of life features that the specification sheets of many competing products do not include.
Form Factor and Compatibility
This is a generic rectangular shaped battery, not a frame integrated shape. Therefore, it is intended to be mounted outside the frame, either in a rack, a bag, or as part of a custom enclosure. The 36V system is compatible with a 36V controller and motor. If your vehicle or project runs a 48V or 52V system, then this battery is not suitable for those systems.
As for the compatibility with various types of motors, the 250W to 1800W motor range is greater than many listings. With a 40A continuous rating and 36V nominal voltage, you could achieve up to 1440W of continuous delivery, therefore the 1800W rating is more applicable to short-term demands and not necessarily sustained output. For most standard 250W to 1000W 36V motors, the 40A BMS will give you a considerable amount of margin.
Real-World Range
At 720Wh, the range is considerably greater than the 540Wh of a 15Ah tier battery without having to jump to a 48V system. At a rate of 15-25 Wh per mile of typical 36V ebike consumption, you could expect approximately 25-45 miles of real-world mileage depending on factors such as road grade and how aggressively you use the throttle. For lighter riders with minimal assistance, you should be able to get closer to the upper end of the range. On the flip side, heavier loads, steeper grades, or aggressive throttle use will put you closer to the bottom end of the estimated range.
720Wh is sufficient for the average commuter who travels less than 25 miles each way to and from their destination. If you plan to ride farther, or want a larger buffer, then a 48V 20Ah system offering 960Wh is a good next step. That said, you would need a 48V-compatible controller to run that system.
What Amazon Reviewers Are Saying
There are no reviews on Amazon for this product. That is the single most important thing to know about this battery currently. While the specifications look great and the feature set looks competitive, without verified customer feedback, there is no way to confirm the quality of construction, the actual capacity, the performance of the BMS, or the overall lifespan of the battery.
If you are interested in purchasing this battery, it might be wise to come back later once reviews begin to accumulate. Check current reviews and pricing on Amazon since this is a recently listed product and the review count will grow.
Who Should Buy This
You should consider the annesc 36V 20Ah battery if you are using a 36V system and the increased BMS rating and the ability to charge USB devices via the battery are important to your design. The use of an XT60 connector and an LED indicator are practical elements that will make working with this battery easier than most of the competition.
The major reason to approach cautiously is due to the fact that there are no reviews of this product on Amazon. If you are not in a hurry, waiting for reviews to accumulate will give you the benefit of buyer validation prior to making a purchase decision. If you need a 36V battery immediately, compare this battery to competing products in the battery comparison table to determine whether the feature trade-offs are worthwhile.
Browse our ebike battery reviews to see additional options at 36V and 48V. To see other 36V 20Ah options, browse 36V 20Ah ebike batteries on Amazon and compare across reviewed and unreviewed options.
Frequently Asked Questions
Should I purchase a battery with no reviews? It depends on how much risk you are willing to accept. Zero reviews means there is no confirmation of the specifications. If the battery meets its specifications, then it is a solid purchase. If it does not meet its specifications, then you will be one of the first to discover this. By waiting for reviews to accumulate, you will reduce the risk, but you may miss current pricing.
What is the difference between a 40A BMS and the typical 30A BMS for my project? A 40A BMS is capable of handling a higher continuous current draw than a 30A BMS before shutting down. For motors that consume between 30A and 40A at peak, having the added margin will prevent the BMS from shutting down. For most standard 36V motors, both 30A and 40A will provide ample room.
What is the USB output amperage of this battery? The listing does not clearly indicate the USB output amperage of this battery. Typically, most battery USB outputs operate at either 1A or 2A, which will support most mobile device charging and some other low-power USB devices. For more power-hungry USB devices, verify the actual output rating before relying on it.
What connector is this battery utilizing? This battery utilizes an XT60 connector. The XT60 connector is commonly used throughout the DIY ebike community and RC communities and is readily available for adapters and replacements.
Will this battery fit into my standard ebike battery mounting bracket? Most likely not, as your ebike probably has a frame-integrated mounting bracket specifically designed for a downtube or shark/hailong style battery. This is a standard rectangular-shaped battery and will therefore require an external mounting bracket or custom enclosure. If your ebike has a removable battery tray or you are building a custom ebike, then this battery will fit.
Does the USB output work while riding? The USB output port allows you to charge devices while the battery is powering your motor. It is useful for keeping your phone charged on longer rides. Drawing significant power from USB while also powering a motor puts more total load on the BMS, but for light USB loads like phone charging, this is generally fine within the total current budget of the battery.
How long will this battery last? Like most lithium-ion batteries, the manufacturer estimates that the battery will last through 1000+ cycles at proper maintenance. Based on one full charge per day, this equates to approximately 3 years. Maintaining partial charges, avoiding deep discharging, maintaining a reasonable temperature, and storing the battery at 40-80% charge when not in use for extended periods will help prolong the practical lifespan of the battery beyond the 3-year estimate.