The UAZ 36V 10.4Ah is a Hailong-style ebike battery with 374.4Wh of capacity for 36V systems. It comes as a full kit with a mounting plate, 42V 2A charger and keys for the lock mechanism, so you get everything you need to install and get riding without having to buy other parts. UAZ isn't one of the bigger names in the ebike battery space, but they do offer this within a range of voltage and capacity levels (there's 48V and 52V options listed under the same product page) and this one is a 36V 10.4Ah. It has a 4-pin connector and XT60 output on the side and is backed by a 30A BMS (the listing title claims 40A, but the product images and bullet points are more accurate).
For riders running a 36V ebike system who are looking for a replacement, or a battery for a conversion, the UAZ 36V 10.4Ah ticks the main boxes at a competitive price per watt-hour. The Hailong form factor is fairly widely used across budget and midsize ebikes and the 4-pin connector is standard and compatible with many 36V controllers. There are a couple of nice extra features you don't often see at this price level, including a USB port to charge your phone and an LED power indicator that shows you how much charge is left. There's a 3.6 star average across 3 reviews, so far the feedback is mixed, but there's an actual positive review from the experience of one buyer who had to buy this as a replacement for a bike battery they no longer manufactured.
Specs and Value
While the images and packaging show a round-down figure of 360Wh, the battery has a nominal 36V voltage and a relevant capacity of 10.4Ah, leading to a storage capacity of about 374.4Wh of energy (36V x 10.4Ah = 374.4Wh). For a 36V pack this is a decent middle capacity that should handle daily commutes as well as shorter recreational rides. The battery weighs 8.26 pounds, which isn't outrageous for a 36V pack of similar capacity in a Hailong housing with a built-in lock and USB port.
Physical specs
Physical dimensions are indicated at 36.73 x 9.5 x 8.9cm (14.47 x 3.74 x 3.5 inches). The housing is a Hailong pack, manufactured from black plastic, sliding into a welded metal plate mounted to the bike's downtube. That plate is quoted as 34.5cm (13.58 inches) long, with mounting slots for attachment spaced 3.7cm (1.45 inches) apart, providing for some position freedom under frame clearance. Also on the top are four LED indicators representing remaining battery power, and a key slot for the pack lock.
The included 42V 2A charger takes about 5 hours to bring the pack from empty to full, which is the standard charger for a 36V 10S lithium ion pack and works fine for overnight charging. Also included are two keys for the lock and a set of screws for attaching the plate to the frame. The battery has a USB output rated at 5V 1A, enough to slowly charge your phone on a ride, but not fast enough for tablets or anything that draws more power.
BMS and motor range
The inbuilt BMS is rated for 30A continuous discharge, which is confirmed by the product images that say "Built-In 30A BMS" in large text. At 36V continuous 30A equals about 1080W theoretical power out, so should handle 1000W motors happily in normal riding use. There's protection against short circuit, over temperature, over current, over voltage and overcharge. UAZ call this a "Smart BMS" and while this is a term adopted by lots of midrange budget batteries it's still a genuine set of protection features and standard for any battery with an active BMS.
UAZ don't state what cell brand or configuration are used in this battery, which again is fairly common with budget Hailong packs. They quote 1,500+ charge cycles, which is about the higher end of lithium ion cells, going more into LiFePO4 territory. Take that claim with a pinch of salt unless you know what type of cells are in there, but at lower actual cycle life say 800 to 1000 cycles (more common for standard lithium cells), that's still a good few years of use before you'd notice usable capacity falling off.
Form Factor and Compatibility
The UAZ 36V 10.4Ah looks to use the Hailong form factor that is one of the most commonly seen battery shapes in the ebike world. The battery slides down into the Hailong housing mounted onto a metal plate that bolts to the downtube of the bike frame. The installation of this type of battery is quite simple. Just bolt down the plate to your frame using the included screws, slide the battery in from the top, and lock it in place using your key. The mounting plate has slotted holes to allow you to move the plate positioned to avoid water bottle bosses or other frame hardware.
The battery uses a 4-pin discharge connector which is a common connector for a 36V ebike system. It also has an XT60 output, giving you a second option for a connection if your controller uses the XT60 instead of the 4-pin plug. The listing mentions that it's compatible with commuter bikes and off-road, but doesn't name specific brands or models. You'll want to make certain that the connector matches your controller before ordering, because even though the 4-pin is fairly common, the pin arrangement may be slightly different between manufacturers. UAZ promises a response time of 24 hours for questions regarding compatibility, so reaching out is likely a good course of action before buying if you're unsure it will fit.
The key lock on the battery is a security feature and convenience for sliding the battery off the mounting plate when you want to recharge the battery indoors. The seller does state water resistant sealing so if you do get caught out in the rain or a puddle this battery should hold up, but never submerge or pressure wash Hailong batteries.
Real-World Range
UAZ claims you'll see 20 to 35 miles to a charge under moderate use. That's a pretty big spread and in reality you will get slightly different distances depending on what motor you're running, the weight of the rider, the terrain, and whether you're predominantly pedaling and just using throttle at times or vice versa. If you have a 250W to 500W motor and are on moderate pedal assist on flat ground, expect real-world figures to be around 20 to 30 miles on 375Wh capacity. If you're pushing a 750W or 1000W motor and going heavy on throttle with hills, you may only see 10 to 18 miles to a charge.
Used for your daily work commute the 374.4Wh capacity should still give you reasonably ample round trips of five to 12 miles per day back and forth, depending on how you attack the return ride. With a five hour charge up time, you can always touch it up during the work day if necessary, or just leave it in charge overnight and ride it the next day bright and early. For a price per watt hour comparison of the UAZ 36V 10.4Ah alongside other 36V batteries, see our comparison table.
What Amazon Reviewers Are Saying
There are three reviews over on Amazon for the UAZ 36V 10.4Ah at a 3.6 out of 5 star average at the time of the writing of this article. Feedback is a mixed bag. The most detailed review is from a 4-star rating who bought the battery as a replacement for a discontinued Mooka ebike. The mounting plate was not an exact match to the old mount but the reviewer removed the old mount and fashioned new hardware around it. The 4-pin connector was a match to the Mooka's controller and after about a month's use the battery was holding its charge well. The reviewer also uses the USB port to charge their phone while riding which worked as expected.
On the negative side, there's a 2-star review that's called simply "Bad" and states that the battery would not charge at all and they returned it. A dead-on-arrival battery is a serious failure, though with just 3 total reviews it's hard to know if this is a regular defect or a one-off. There's a 5-star review that didn't appear in the English-language review listing that also contributes to the average.
With such a low number of reviews (3) you can't make any strong conclusions, and the positive experience from the Mooka bike owner gives hope, while the DOA is a good reminder to test the battery immediately, and to be aware of your return window. UAZ provides a 3-month replacement warranty and 12 months technical support, so there's some safety net there if you do receive a dud. Compare the UAZ 36V 10.4Ah alongside other batteries on our battery comparison table.
Who Should Buy This
If you're running a 36V system with a 4-pin connector and need a Hailong-style replacement, consider the UAZ 36V 10.4Ah. 374.4Wh is a nice mid-range amount for zipping back and forth to work and taking short jaunt rides. The 30A BMS shouldn't have trouble handling a motor up to 1000W. The battery comes with a charger, mounting plate, and keys, so that you can literally just take it out of the box, mount it, and ride. It has a USB port and an LED indicator too, which are features you'll usually have to pay a little more for.
There are mixed reviews. One user mentioned a great experience using it as a replacement for a discontinued bike, and another had not received one that even charged. Having a 3-month replacement policy does ease the potential worry there. If you're running a 36V system with a 4-pin connector and the Hailong battery will fit in your frame, then the UAZ 36V 10.4Ah is competitive on price per watt-hour. Our comparison table can show you just where it stands.
Frequently Asked Questions
What BMS does the UAZ 36V 10.4Ah actually have, 30A or 40A? In the product title the rate is 40A, but in the bullet points and product images it's 30A, so it's likely that the latter is the actual number. The detailed specs and infographic images are more reliable than the title text, especially considering that multi-variant Amazon listings tend to have incorrect product titles.
What charger comes with the UAZ 36V 10.4Ah? The battery will come with a 42V 2A charger, which is exactly correct in voltage for a 36V lithium-ion pack with a 10S configuration. It charges from empty to full in about 5 hours.
Does the UAZ 36V 10.4Ah have a USB port? Yes, it's fitted with a USB output rated at 5V 1A. That's enough to slowly charge your phone while riding, but not powerful enough for fast charging or higher-draw devices.
What connector does the UAZ 36V 10.4Ah have? It has a 4-pin discharge connector and an XT60 for output. A 4-pin connector is a fairly common discharge connector for 36V ebike systems, but the pin arrangement does change from manufacturer to manufacturer. Confirm that it matches your controller before ordering.
How long will the UAZ 36V 10.4Ah last before it needs replacing? UAZ claims 1,500+ charge cycles, though that is a bit optimistic for the cells that they're likely using. A more conservative estimate would be around 800 to 1,000 cycles before noticeable capacity loss, which still translates to years of daily use.
What warranty does the UAZ 36V 10.4Ah come with? With a 3-month replacement and 12-month technical support, if you receive a defective unit you have a window to test it and send it back.