Amazon's current pricing puts the 1440-watt hour Varstrom 48V 30Ah among the lowest cost large-capacity e-bike batteries currently offered on the website.
This listing is quite unique. Rather than providing individual product pages for each of the seven possible capacity variations available through Varstrom, they provide one product page with seven different capacity options. When ordering you are able to pick either your desired voltage (36V, 48v, 52v), and your desired amp-hours (13Ah through 30Ah). The 48V 30Ah version we're reviewing provides 1440 watt-hours in a case that measures 15.6 inches long by 3.7 inches wide by 6.1 inches high. That length measurement makes it difficult to place in a frame triangle.
Specs and build quality
The Varstrom 48V 30Ah is a rectangular case battery, neither a shark nor dolphin style battery, so it doesn't offer any standard mounting patterns. Therefore, if you are purchasing this battery, you will need to attach it to a rear-rack or develop a bracket yourself based upon the dimensions provided below. Please review these dimensions prior to making your purchase as the battery is approximately 15.6 inches long and will likely not fit into most frame triangles.
While Varstrom states there are over 1000 charges, they don't specify what type of cells were used to create their battery, however, due to the low price point for a battery of this size, it would be unlikely for them to utilize name brand Samsung or LG cells. However, generic 18650 cells should suffice for most applications, assuming the BMS was properly manufactured.
Varstrom lists both the number of amps the BMS can handle as well as the continuous wattage of the BMS (based upon the continuous amperage rating). Based upon the 30ah designation for the 30ah model, the maximum continuous amperage of the BMS would be 30 amperes. This translates to a maximum continuous wattage of approximately 1440 watts (using the formula p = a * v). Assuming an average efficiency rate of approximately 75% (as most ebike motors require at least 250w to operate efficiently), a hub motor rated at 750W or lower and/or a mid-drive rated at approximately 500w or less would be suitable. Additionally, using a 1000w+ setup may result in additional stress on the BMS (due to excessive continuous usage beyond its designed capabilities).
For higher power setups greater than 30 amps continuous, you may find the 40 amp BMS designation on the other two models (the smaller capacities in the 52v model) would be a better option.
BMS, range, and real world Performance
The integrated BMS protects against four types of failure:
- overcharge
- over-discharge
- overcurrent
- short circuit
In addition, while nothing exotic here, no smart phone apps, no bluetooth monitoring capability, no cell level balancing information. Just simply protecting the battery from damage during operation.
Certification UN38.3 is noted, which means the battery successfully passed all required safety testing for transportation of lithium-ion batteries. While this is mostly important for shipping purposes, it does give some assurance regarding general battery construction quality.
As a side note: the Varstrom listings are somewhat unusual in that instead of offering standard variant selection tools (drop-down menus or radio buttons) when creating your order, Varstrom requires you to "customize now." In order to ensure you select the correct configuration, please double-check your selections before completing your transaction.
Theoretically, a full-throttle ride utilizing a motor capable of consuming approximately 500 watts would yield approximately 2.8 hours runtime from the battery.
Of course actual Range depends heavily upon how much energy you burn to move through your environment. Your bike characteristics, your Weight and whether you're riding up hill down hill on flat ground, etc., all determine actual Range.
Using our example of a typical commuter bike with a 750W hub motor consuming approximately 20 wh/mile (which is roughly equivalent to a moderate paced commute with steady assistance) the approximate Range would be about 70 miles. We think this is an accurate representation of real world Performance, not overly optimistic like some manufacturers' claims based upon ideal laboratory conditions.
Options for your controller
If you happen to have a 48v ebike controller, then you'll be happy to know that this battery will work directly without any modifications. Of course if you've got a controller that operates at 52v then you can still purchase this exact same item but select the alternative capacity designation (i.e., selecting the capacity/designation that represents a 52v ebike application). Likewise, if you've got a 36V ebike controller then you could select the applicable 36V capacity designation but keep in mind your overall power output will be reduced compared to the higher voltage options.
For a full comparison of 48V batteries, see our ebike battery comparison table.
What Amazon reviewers say
We had access to five reviews that averaged a score of 5.0 stars. Reviewers felt this battery worked nicely with BAFANG mid-drive kits and reviewers stated the supplied charger functioned as expected. To date nobody has reviewed their experience regarding long term reliability based on Varstrom's claim of over 1000 charge cycles.
Reviewers primarily concerned themselves with ensuring they selected the appropriate size battery prior to submitting their order. As previously stated, since there are multiple configuration possibilities, it is relatively simple to accidentally select the incorrect configuration. Be certain to measure your battery tray prior to placing your order.
Who Is This Battery For?
The Varstrom 48V 30Ah is for riders who need maximum range on a budget. This is the cheapest way to get 1440Wh of capacity in a single battery pack on Amazon. For long-distance commuting or multi-day touring without frequent charging, this pack delivers. The battery comparison page shows how it stacks up against similar large-capacity packs.
Best fits:
- Commuters doing 30-plus miles daily who want to charge every other day
- BAFANG mid-drive builders looking for affordable high-capacity power
- Riders who can fabricate or buy a rear-rack mount for the rectangular case
- Anyone comparing battery prices by dollars per watt-hour
Probably not right for:
- Riders needing a drop-in replacement for a specific shark or hailong battery tray
- Weight-conscious builds, this is a large pack
- High-power setups exceeding 30A continuous draw
Frequently Asked Questions
Does the Varstrom 48V 30Ah fit standard battery mounts?
No. The rectangular case doesnt match common mounting plates. You need to check the dimensions (15.6 by 3.7 by 6.1 inches) and plan your own mount. The listing includes a mounting plate but its not designed for specific bike frames.
What connector does this battery use?
XT60. That is the standard connector for most ebike controllers and BAFANG kits. If your controller uses a different connector, you will need a compatible adapter.
Is the BMS programmable?
No. The BMS is a fixed-protection board with no user-adjustable settings. It prevents overcharge, over-discharge, overcurrent, and short circuits automatically.
Can I use this with a 1500W motor?
The 30A BMS limits continuous output to roughly 1440 watts. That is tight for a 1500W motor under sustained load. The 40A BMS models (25Ah and 52V variants) handle higher power better.
Does it come with a charger?
Yes. The package includes a compatible battery charger, a mounting plate, and a spare key for the lock mechanism.
How does the price compare to other batteries?
At around 15 cents per watt-hour, this is among the most affordable large-capacity 48V batteries available. Our comparison table shows the full range of options sorted by price per watt-hour.