There is one major difference between the BtrPower 48V 15Ah and other cheap ebike batteries. The BtrPower 48V 15Ah has LiFePO4 (lithium iron phosphate) which is the lithium chemistry behind grid scale energy storage systems and electric vehicles. LiFePO4 is fundamentally non-combustible. Puncture it, overcharge it, short it, it will not enter thermal runaway the way that standard lithium-ion can. The majority of cheap packs use NMC or ternary cells. The BtrPower 48V 15Ah goes the opposite direction and that is important for riders who store their bikes inside and/or charge their bikes overnight.
See current pricing on Amazon.
.
Specs and Build Quality
The BtrPower 48V 15Ah is a 48V ebike battery with 15Ah of capacity for 720Wh of usable power. The battery has a 16S1P configuration. 16 cells connected in series with each cell having one positive terminal. This is common for a 48V LiFePO4 pack. The battery uses non-toxic polymer soft-pack cells that do not contain heavy metals such as cobalt.
Dimensions of the battery are approximately 11.1" x 5.9" x 2.8". These dimensions are smaller than what would be expected for a 48V 15Ah pack and provide the flexibility to fit a variety of mounting configurations including bags, under racks, and custom enclosures. The battery management system (BMS) provides protection against excessive charge/discharge, short circuits, and high temperatures. The BMS can handle up to 30 amps continuously (and up to 1440 watts peak), providing plenty of margin to run an 800-watt motor continuously (the motor would likely trip the BMS during sustained operation).
A charger is provided with the purchase of the battery. Although some cheaper lithium ion batteries require you to purchase a separate charger. BtrPower states that this pack can be substituted for four 12-volt battery systems wired in series. This means that if you have a scooter or motorcycle with a 4-battery setup, you can substitute this single pack.
Cycle Life
LiFePO4 is a clear winner when looking at cycle life. The cells used in this pack are rated for between 1500 and 2000 charge cycles before they reach 80% of their original capacity. Typical NMC Lithium-Ion cells are typically good for around 500-800 charge cycles before reaching that same point. Therefore, assuming the user charges the battery once per day, the BtrPower LiFePO4 pack should easily outlast two to three times as many standard lithium-ion packs. Since this equates to longer overall usage, the cost per ride will actually be less using the BtrPower LiFePO4 pack.
LiFePO4 Safety: The Real Advantages
LiFePO4 is the exact same chemistry used in large-scale energy storage applications (e.g., large utility-scale solar farms, emergency backup systems at hospitals, etc.) and in high-performance electric vehicle applications precisely due to the fact that it is chemically non-flammable. Whether charged in your living room, left plugged in all night while you sleep, stored away in your garage, or otherwise utilized safely indoors, the anxiety associated with leaving a LiFePO4-based ebike battery unattended and plugged-in is simply nonexistent compared to that of a standard lithium-ion based ebike battery. Additionally, LiFePO4 cells are inherently non-toxic and cobalt-free.
Range and Performance
Based upon the specifications listed above, we would estimate that users could achieve around 20-30 miles per charge utilizing a standard 500-W hub-motor with moderate pedal assistance. However, those users who opt to aggressively utilize their throttles (i.e., full-throttle riding) especially on hilly terrain could expect to achieve ranges in the vicinity of 15-20 miles per charge. In general terms, actual range achieved will depend upon the same factors as any battery type (i.e., rider weight, tire inflation pressure, terrain difficulty level, assist mode utilization, and throttle utilization).
On flat terrain with moderate assist levels many users report achieving ranges well beyond our estimated minimum range of approximately 25 miles. Users who experience significant hills or aggressive throttle utilization may find themselves limited to around 12-15 miles per charge.
As mentioned previously, this pack is configured with a 16S1P arrangement resulting in a nominal operating voltage of 51.2-VDC, which is within the typical range required by virtually all commercially available ebike systems operating at nominally 48 volts DC. Included with the purchase of this pack is a charger specifically designed for LiFePO4 chemistry (as opposed to generic chargers commonly marketed for standard lithium-ion battery types). As such, we recommend utilizing this charger instead of attempting to utilize a generic 48-VDC lithium charger which may employ incorrect profiles for safe charging of LiFePO4 chemistry packs.
Note regarding LiFePO4 chemistry: The voltage output curve of LiFePO4 is essentially flat across nearly all of the discharge process and then rapidly declines toward the end of the discharge cycle. Due to this unique characteristic, your display may continue to indicate "full" for an extended period prior to rapidly indicating "low". This behavior is entirely normal for LiFePO4 chemistry.
Compatibility and Installation
Unlike many commercial ebike manufacturers' proprietary packaging arrangements, this is a universal style battery compatible with a vast number of ebikes and scooters/motorcycles. Due to the relatively compact size of this pack (approximately 11.1" x 5.9" x 2.8"), installation options are numerous and varied depending on desired mounting schemes. Although brand-specific mounting hardware is not provided with this pack (to encourage customization options), a variety of after-market mounting solutions exist.
Manufacturer's Warranty:
Three-month free return or replacement with twelve-month service support provided by manufacturer.
Who Should Purchase This Pack?
Safety-conscious ebikers who prefer to minimize risk and maximize reliability.
Custom builders who desire flexibility in their designs.
Any user seeking maximum durability and cycle-life in their ebike battery selection.
For more options, check the battery comparison table.
For more options, check the ebike battery reviews.
Who Should Buy This
This rider is focused on safety first. If you store your ebike in an apartment, if you charge your ebike in your bedroom, if you take the battery on public transportation, then LiFePO4 offers genuine peace of mind.
Best For
- Riders who store or charge their ebike indoors
- DIY builders and conversion projects wanting flexible mounting
- Commuters who value safety and longevity over raw range
Additionally, this pack will be perfect for custom builds and conversion projects where flexibility and space are important. Because of the universal form factor, you can easily mount the pack without being restricted by a particular mounting system. The BtrPower LiFePO4 pack will likely be one of the most affordable options for getting LiFePO4 in your project.
For those who have a mid drive or hub electric bike that has less than 800 watts of power (and a bms rated at 30 amps) then the BtrPower LiFePO4 pack will provide excellent protection and longevity for your ebike. Although you may lose some range compared to other higher capacity packs, having such a large number of safe cycles available (1,500+) means you will likely still be riding after you've burned through multiple packs. Therefore, the BtrPower LiFePO4 pack provides a competitive cost per ride when looking at the overall cost of ownership.
See the battery comparison chart to compare the cost per wh/hour of this product with others. Additionally, check out more ebike battery reviews for alternative products.
Frequently Asked Questions
What makes LiFePO4 batteries safer than regular lithium-ion batteries?
LiFePO4 batteries are chemically non-flammable. Regardless of whether you puncture them, over-charge them, or short-circuit them, they can't burn. They're using the exact same chemistry used in utility scale energy storage systems.
How much range can i get with a 720wh battery?
Depending on the size and type of motor, you should expect about 20 miles of range per full charge with a moderately powered 500W motor with light to moderate pedaling assistance. More aggressive throttle use may drop that down to 15 to 20 miles per full charge.
How many charge cycles do these last?
LiFePO4 cells typically last 2x longer than standard NMC lithium ion batteries. This translates to around 1,500 to 2,000 charge cycles before reaching 80% of their original capacity.
Will my current battery fit on top of the universal bracket that comes with this product?
It depends. Since these packs have a universal mounting style, they'll work fine as long as your ebike's frame doesn't require a manufacturer branded bracket.
Is there an included charger?
Yes. You get a charger with the purchase of this product. Make sure to use the provided charger because LiFePO4 requires a unique charging profile that differs greatly from what is required for traditional lithium-ion batteries.
What kind of warranty does BtrPower offer?
Btr power offers a 3-month money back guarantee or replacement and 1-year limited warranty.