You can get 720 watt-hours for under 170 bucks.
That's what we've got here. The Generic 36V 20Ah ebike battery has a 30A BMS and weighs around 8.2 pounds. It's hard to find an offer like this with a 30A BMS at this price from many sellers.
The dimensions of the battery case are approximately 7.87 x 5.03 x 2.71 inches. This makes it suitable for DIY projects and aftermarket conversion projects when there isn't room to install a larger battery.
Also, the battery is lighter than larger units because of its smaller size.
Specifications and Build Quality
It's a 36V nominal battery (10 series cell) and the 20Ah capacity gives you a total energy amount of 720Wh. This gives you about 20 to 30 miles of actual ride time depending on your motor configuration, road conditions and whether you rely on the throttle or pedal assist.
They say it uses grade A lithium-ion cells. I cannot confirm if their statement is correct as I have not torn apart the battery pack. However, their specifications match other similar products available at this price point.
The 30A BMS included in the pack has a continuous rating of up to 800W of load. This would cover all of the common 250W to 750W hub motors.
If you're using a 1000W motor, you could hit the limit of the BMS while climbing a very steep hill.
Included with the pack are both XT60 and T connector connections. Both of these connectors are widely used in the ebike industry. If you're using something else, then simply soldering a connection or purchasing a low-cost adapter will solve your problem.
BMS, Safety and Design Features
The six-point BMS provides protection against overcharging, undercharging, short circuit, high voltage, high current, and high temperature. Nothing too special, no Bluetooth or smart technology. At this price point, that's probably good enough for most buyers.
There is a built-in USB port on the battery case that allows you to charge a mobile phone or a USB light from the pack. Not a must-have feature by itself, but handy during extended rides.
A secure-lock mechanism is provided to prevent accidental disconnection. Some budget-pack makers don't always provide secure connections.
LED indicators show the current state of charge of the pack.
Amazon Reviewer Feedback
One reviewer purchased this product and rated it four stars, stating that the product performed according to expectations. Hard to draw broad conclusions based upon this limited number of reviews. With budget packs sold on Amazon, you usually buy based on specifications rather than community feedback.
The lack of customer reviews is worth noting. For a battery that's been listed for a while, you'd expect more feedback if it were a high-volume seller. This might mean it's a newer listing or just not a popular model. Either way, there's no track record to lean on.
That said, the seller does offer thirty days for returns and twelve months for warranties. Always test the battery immediately after receiving it, charge it completely, measure the voltage with a multimeter, and take it for several test rides near your house before leaving home.
Who Can Use This Battery?
Budget-minded builders looking for a 720Wh option on a tight budget. Builders planning to convert a bike with a 36V kit and want to minimize costs should consider this option. For casual riders who don't push their battery to the limit every ride, this pack offers decent range without breaking the bank.
The small footprint of this battery is ideal for frames that cannot accommodate a standard downtube-style battery. Step-through frames, folding bicycles, custom builds. And since it's lighter than many comparable packs, it won't add too much weight to your setup either. That matters if you have to carry your bike up stairs or lift it onto a rack.
Where it falls short: the 30A BMS limits peak output, so high-power riders should look elsewhere. Single review means you're taking a gamble on long-term reliability. And the Generic branding means no established reputation.
Frequently Asked Questions
What is the real-world range of this battery?
You can estimate 15 to 30 miles of range, depending upon the motor's horsepower rating, terrain, and whether you're using throttle-assist or pedal assist. If you have lighter body weight, a lower pedal assist setting and mostly ride on flat ground, you'll likely see the 25 to 30-mile mark. Conversely, if you weigh more and regularly ride on hills using the throttle for assistance, then you may see the 12 to 15 mile range.
Does this battery fit standard ebike battery mounts?
Unfortunately, the battery doesn't conform to either a Hailong style or a Shark style case design. Therefore, mounting this battery will require placing it in a frame bag or attaching it to a rack instead of sliding it into an existing battery mount.
Can it be used with a 48V controller?
No. Since this is a 36V battery, using it with a 48V controller could damage the internal cells and trigger the BMS. Only run this battery on a 36V system.
What type of charger is supplied?
The battery includes a compatible 36V lithium-ion charger. The charger has a standard barrel connector that connects to the battery. Recharging takes approximately 4 to 6 hours from dead.
What's the warranty?
The manufacturer offers both a 30-day money-back guarantee and a 1-year warranty for parts and service. Be sure to check for any changes in Amazon's policies regarding warranties since Amazon listings are subject to change.
Does it include a battery management system?
Yes, the built-in 30A BMS handles all the standard protections. Overcharge protection, over-discharge cutoff, short circuit prevention, high voltage limits, over-current safety, and thermal cutoff. It's not a smart BMS with Bluetooth connectivity, but it covers what you need for safe daily riding. The BMS is what makes this battery safe to leave on a charger overnight, though it's always good practice not to.
Is the USB output safe to use while riding?
The onboard USB output is okay for charging a smartphone or action camera. Don't expect fast charging, it'll provide about 5 volts at 1 to 2 amps.
If you need a compact 720Wh battery and are on a budget, this Generic 36V 20Ah battery is worth considering. The BMS includes all basic protection modes. Compare other 36V ebike batteries in the table to see how this one stacks up against the competition. Also check our blog for more ebike battery guides and reviews.