The RANSYRI 36V 8Ah battery is priced near the top of the price-per-watt-hour spectrum for 36V packs, at about 0.36 per Wh. The 288Wh pack is designed to be compact and lightweight for riders and DIY builders who run 200 to 600W systems. It ships in a waterproof triangle-shaped bag with a 42V 2A charger and features two connectors, XT60 and T-Plug, allowing for greater flexibility when it comes to wiring configurations. The battery also includes a 20A BMS for added safety features and the UL2271 certification provides a level of assurance regarding heat dissipation and vibration resistance. Based upon its early Amazon reviews, the RANSYRI 36V 8Ah appears to have a strong launch.
Specs and Build Quality
The RANSYRI 36V 8Ah battery provides 36V nominal at 8Ah for a total of 288 watt-hours of usable energy. While this is a smaller 36V pack, the 288Wh capacity is sufficient for lighter systems operating 250W to 500W motors. The 20A BMS includes protection features for overcharge, short-circuit and over-discharge conditions. The manufacturer also states that the battery meets UL2271 standards for heat dissipation and vibration resistance, which is a more stringent certification than many budget listings.
Physical specs
The dimensions of the pack are 14.5 x 4.5 x 3.54 inches and it weighs 4.84 pounds. The size and weight are very lightweight for an ebike battery and the compact shape allows for easier installation in a frame bag or mounted to a rack without consuming too much space. The waterproof triangle-shaped bag that accompanies the battery provides additional protection from rain and trail splashing. RANSYRI describes the bag as having a hermetic inner seal that protects against corrosion and impact, and according to Amazon reviewer comments, the waterproofing works effectively in the field.
BMS and motor range
The 20A continuous BMS is suitable for the 200 to 600W motor range that this battery is targeted for. The maximum theoretical continuous output of the BMS at 36V and 20A is 720W, so there is some margin at the upper end of the supported motor range. In general, the BMS will operate easily with standard 250W or 350W hub motors. Additionally, the dual connector arrangement with both XT60 and T-Plug connectors offers a convenient feature that eliminates the necessity of sourcing adapters for most common installations. The wide availability of XT60 connectors within the DIY ebike community and RC community simplifies the task of obtaining replacement or adapter connectors.
Form Factor and Mounting
The RANSYRI 36V 8Ah is not a frame-mounted battery. It is supplied as a rectangular pack enclosed in a waterproof bag, so you will need to mount it outside of the frame. The triangular-shaped bag configuration indicates that the battery is intended to be installed inside the frame triangle of a typical bicycle frame, but the bag can also work attached to a rear rack or contained within a custom enclosure. If your ebike has a proprietary downtube or shark/hailong mounting system, this battery will not slot directly into that bracket.
The major advantage of the exterior form factor is that it is extremely versatile. The battery can be installed on virtually any 36V build as long as there is adequate room to attach the bag. The primary disadvantage is that it is not as aesthetically pleasing as a frame-integrated battery, and you need to ensure that your chosen mounting method secures the battery sufficiently to prevent movement during high-stress ride situations.
Real-World Range Estimates
Using a 288Wh battery, you will obtain approximately 10 to 20 miles of range based upon your configuration and riding habits. Lighter riders on flat terrain using pedal assist on a 250W motor will tend toward the upper end of this range, while heavier riders on hilly terrain running full throttle on a 500W motor will consume the capacity more quickly and will likely achieve lower mileage, such as 10 miles or less.
For shorter commutes under 10 miles each way, 288Wh is sufficient for daily driving. For longer trips, this battery is best suited as a backup or secondary battery. To achieve increased range from a 36V system, increasing to a 10Ah or 15Ah pack is a logical progression and you can see comparisons of these batteries on our battery comparison table.
What Amazon Reviewers Are Saying
The RANSYRI 36V 8Ah battery has a current 5.0 star rating on Amazon, although the number of reviews is still quite small, totaling five. A perfect score from a handful of early reviewers looks different than the same rating from a larger body of reviewers, so that is worth keeping in mind.
Regardless of the number of reviewers, what they have reported thus far is generally favorable. Users report that the battery is well-packaged and shipped completely charged, which is generally a good sign for lithium-ion products. Several reviewers have mentioned that the waterproof bag seems sturdy and the connectors fit securely. Multiple reviewers have commented on how small and light the battery is, stating that it is clearly much lighter than other batteries of comparable application.
To date, no reviewer has complained of any issues. As there are only five reviewers in total, we cannot say whether any patterns exist relative to the long-term durability of the battery, the actual number of cycles, or BMS performance under prolonged loading. If durability and documented history are important to you, it may be wise to check back on the RANSYRI 36V 8Ah listing on Amazon after the reviewer count increases.
Who Should Buy This
The RANSYRI 36V 8Ah battery is ideal for DIY builders constructing smaller 36V systems in the 200 to 500W range and wanting a compact, waterproof and economical battery. The dual connector arrangement, included charger and UL2271 certification combine to represent a good value for the money. If you are creating a lightweight commuter ebike, powering a scooter or utilizing a low-voltage project, this battery represents a cost-effective alternative that satisfies your requirements without complicating the process.
There are two reasons to consider passing on this option. First, there is limited review history associated with this product. Second, the capacity of 288Wh is somewhat limited. If you require a great deal of range or you want the comfort of knowing that there are hundreds of reviewed and documented cases supporting the manufacturer's claims, this may not be the correct battery for you at present. But if you are willing to act as an early adopter at this price point, the specifications for this battery appear competitive, and the early reviewer comments are positive.
Compare all 36V options in our ebike battery reviews, or compare prices across all voltages on the comparison table.
Frequently Asked Questions
Will 288Wh be enough for my daily commute to work? The answer to this question is dependent upon your commute distance. For those whose commutes are less than 10 miles one-way with most of the terrain being flat and utilizing pedal assist on a 250W motor, 288Wh will typically meet your needs. Conversely, if you are a heavier rider or are traveling over hilly terrain at full throttle with a 500W motor, the capacity will be consumed more rapidly and you will likely only achieve 10 miles or fewer.
Which motors is the RANSYRI 36V 8Ah compatible with? According to RANSYRI, the 36V 8Ah battery is suitable for 200 to 600W systems. The 20A BMS at 36V can provide up to 720W continuous, so most 36V motors in the 250W to 500W range will function properly with this battery. Be sure to verify that your controller is rated for 36V prior to connecting.
Will the waterproof bag protect the battery from water? According to Amazon reviewers, the waterproof bag functions well in protecting the battery from rain and trail splashing. Due to the limited number of reviews, it is difficult to determine the long-term durability of the waterproof bag. RANSYRI describes the bag as having a hermetically sealed interior that protects against corrosion and impact. From the comments provided by Amazon reviewers, it appears that the waterproof bag functions well in the field.
Can I connect this battery to a 48V ebike? No. This is a 36V battery and should only be connected to 36V controllers and motors. Connecting this battery to a 48V system will produce reduced performance and potentially damage the controller. Always ensure that the battery voltage matches the voltage of your system.
How long does it take to charge from empty? The included 42V 2A charger will take approximately 4 hours to fully charge the 8Ah pack from empty. That is reasonable for an overnight charge or a midday top-off. If you want faster charging, a compatible 36V lithium-ion charger rated at 3A or higher would reduce the time, but make sure it outputs 42V for a full charge.
What is the expected lifespan of this battery? RANSYRI claims 1000 or more charge cycles, which translates to roughly 3 years of daily use. Proper maintenance practices like avoiding full discharges, storing at 40 to 80 percent charge, and keeping the battery at moderate temperatures will help extend the practical lifespan beyond that estimate.