The Cymoye 48V 16Ah LiFePO4 ebike battery is a 16Ah lithium iron phosphate pack that has 768Wh of total capacity. Cymoye is offering this option in several sizes, ranging from 16Ah to 30Ah, for both 48V and 52V configurations. This 16Ah option has a better price-per-watt-hour ratio than the others we've reviewed, which is part of what drew us to it. It comes with a 3A charger and uses LiFePO4 cells, not standard lithium-ion. This means the battery will have a longer cycle life and improved thermal performance. The listing has been active since 2021 and has had a few reviews from customers who have put several different versions through real-world use.
Specs and Build Quality
The Cymoye runs at 48V nominal and has a capacity of 16Ah for a total of 768Wh. That is a very good amount of energy storage, especially when using LiFePO4 chemistry. LiFePO4 cells are generally heavier and bulkier than standard lithium-ion for the same capacity, but LiFePO4 cells have substantially better cycle life and safety. These cells are also non-flammable, eliminating one of the main fears ebikers have regarding lithium batteries on ebikes. The down-side is that this battery is almost 16 pounds, so you'll need to properly secure it.
Physical specs
The battery is 8.66 x 5.7 x 5.32 inches in physical dimensions and has a rectangular box form factor. It is not designed to slide into a downtube mount or a shark pack holder. This is a single unit that you would need to strap or mount to your frame using your own mounting solutions such as bags, straps, or brackets. Depending on your bike geometry, the compact box shape may be usable attached to a rear rack, or inside a frame bag. Cymoye includes a 58.8V 3A charger, which should fully charge the 16Ah pack in roughly 5 to 6 hours.
BMS and motor range
The 30A BMS provides over-current, over-charge and over-discharge protection. At 48V with 30A continuous discharge, the battery can theoretically support motors up to 1440W. Cymoye recommends the battery for 350W to 1800W motors. The BMS is fairly conservative at 30A, which will help protect the LiFePO4 cells, and will likely contribute to the stated 1000 cycle lifespan. Packs made with LiFePO4 cells typically last twice as long as standard lithium-ion cells when it comes to charge cycles.
Form Factor and Compatibility
This is a generic box-style battery with no specific ebike model compatibility. Therefore, it appeals to many DIY ebike builders, as well as riders who run a 48V system and just want a universal battery. However, that also means you'll need to determine your own connector scenario and mounting solution. The listing doesn't specify what connector type is used on the output cable, so you should verify the compatibility of your controller with the connectors in the package before buying.
Cymoye suggests that the battery will support 350W to 1800W motors. Most 48V ebike systems fall into that range. If you're running a 500W hub motor on a commuter, or a 1500W mid-drive motor on a mountain bike, the battery's capacity and 30A BMS should be able to supply enough energy. However, larger-draw motors will consume the 768Wh quicker and the 30A BMS will disconnect if you exceed the specified limit.
For a broader selection of 48V batteries sorted by price per watt-hour, look at the battery comparison table.
Real-World Range Estimates
The Cymoye should provide approximately 25 to 40 miles of range based upon your motor, terrain, riding style, and how much you pedal. Cymoye suggests that you should receive 35 to 40 miles, which is reasonable for a lighter rider using moderate pedal assistance on flat ground with a 500W motor. On hilly terrain with a larger motor and aggressive throttle application, you can anticipate 20 to 25 miles.
One of the benefits of the LiFePO4 chemistry in the Cymoye is the increased durability of the cells. Standard lithium-ion ebike batteries tend to show capacity degradation around 500 to 800 cycles. LiFePO4 cells, on the other hand, can complete 1000 cycles or more before you experience a noticeable drop in capacity. So although the Cymoye may offer the same number of miles per charge as a standard lithium-ion 768Wh battery on the first day of service, the Cymoye should still be working effectively after three to four years of daily use when a standard lithium-ion pack may already be showing signs of wear.
What Amazon Reviewers Are Saying
The Cymoye LiFePO4 battery has a 3.7 out of 5 star rating, based upon 7 reviews. The reviews are a true mix of opinions. One customer that received a larger version of the battery stated that the seller gave him the 30Ah version when he was originally ordered the 20Ah version, saying that he thought the seller was "a really cool seller". He also said that a separate 72V 40Ah pack from the same company "just keeps going and going with tons of power".
However, one of the reviewers stated that he tested the actual capacity of his pack and that it read 17.87Ah instead of the advertised 20Ah. He also thought that it was a great deal because his previous 15Ah battery from another manufacturer was nearly double the price for similar size and weight. So the actual capacity is probably lower than the listed capacity, but the overall value of the battery appears to still be strong.
Another negative review came from a customer who purchased the 30Ah variant of the battery to install in a golf scooter and felt that the actual capacity of the battery was not as indicated by the specifications based on the results of voltmeter tests. Although the discharge curve for LiFePO4 cells is flatter than for standard lithium-ion cells, the question of whether actual capacity matches the rated capacity is something that comes up often.
You can check the latest reviews on Amazon to see what newer buyers have posted.
Who Should Buy This
The Cymoye 48V 16Ah LiFePO4 battery is a good choice for DIY ebike builders and ebike riders who want the safety and longevity of LiFePO4 cells at a competitive price per watt-hour. The 768Wh capacity will give you ample range for most rides, and the 30A BMS will provide plenty of juice for motors up to about 1400W. With a 1000 cycle lifespan, this pack should serve you well for many years of casual commuting, or frequent weekend riding.
There are a couple of things to consider. The box form factor means you will need to design your own mounting solution. The reviews indicate that the actual capacity of the pack may be a bit lower than the rated capacity. At 16 pounds, the pack is not light. And the connector information provided in the listing is ambiguous, so you should contact the seller to determine what connectors are included with the battery before you purchase. If you can live with these limitations, the Cymoye LiFePO4 pack is a good option for a lot of energy storage at a low price. Look at our other ebike battery reviews for additional options.
Frequently Asked Questions
What is LiFePO4 and why does it matter for ebike batteries? LiFePO4 is short for lithium iron phosphate. It is one of the safest types of lithium battery chemistries. As LiFePO4 cells are non-flammable, they eliminate one of the major safety issues ebikers have regarding lithium batteries on ebikes. Additionally, LiFePO4 cells last approximately twice as long as standard lithium-ion cells, typically lasting 1000 or more charge cycles.
Does the Cymoye 48V 16Ah battery come with a charger? Yes, Cymoye supplies a 58.8V 3A charger with the battery. You can expect to recharge the 16Ah pack in roughly 5 to 6 hours.
What types of motors can this battery support? Cymoye recommends that the battery be used with motors of 350W to 1800W. The BMS will allow for 30A of current flow, supporting motors of up to 1440W. In terms of battery longevity, it is suggested to use motors within the recommended range.
Can I trust the ratings for the battery capacity? According to Amazon reviewer tests of larger versions of the battery, the measured capacity was about 10 percent less than the rated capacity. The 16Ah version may actually measure closer to 14 to 15Ah. This is a typical issue for most ebike battery manufacturers.
How do I attach the battery to my ebike? The Cymoye is a stand-alone box-type battery, with no pre-existing frame attachment method. You will require your own mounting method for securing it, such as a bag, bracket, straps, or a rear rack. You should ensure that the mounting method you choose can support the weight of the battery, which is nearly 16 pounds.
Are there other voltage and capacity options available? Yes, the Cymoye listing covers multiple variants including 48V and 52V options with capacities from 16Ah up to 30Ah. You can select your preferred configuration from the same Amazon product page.