FREESKY Alaska Pro M-520
FREESKY's product pageThe FREESKY Alaska Pro M-520 is an electric bike with a 48V 45Ah Cell Lithium Battery（18+27Ah）, a 4500W Peak Brushless Motor, a stated top speed of 40 MPH, a stated range of 98-175 Miles, a weight of 90 LBS and a load capacity of 400 LBS.
Last updated: 8 September 2026
What we found
- 1 battery is documented for it: FP4818R0, from the manufacturer's own documentation.
- 32 specifications are published for it, each with the source it was read from.
- 2 certification standards are cited for it: UL 2849, UL 2271.
- No matching recall was found in the records this catalogue holds from 8 regulators.
Assembled from the evidence on this page. Every figure and count below is shown with the source it was read from.
Motor and performance
- Peak power
- 4500W
- Torque
170N·m Torque
alaska-pro-m-520 · retrieved by us 7 September 2026
“Cadence Sensor 170N·m Torque”
Source: freeskycycle.com/products/alaska-pro-m-520
170 N·M
product-comparison · retrieved by us 7 September 2026
torque: "170 N·M"
Source: freeskycycle.com/pages/product-comparison
160 N·m
e-bike-torque-explained-how-much-torque-do-you-need · retrieved by us 8 September 2026
“For example, the FREESKY Alaska Pro M-520 is rated at 160 N·m of torque , making it one of the highest-torque options in the FREESKY lineup.”
Source: freeskycycle.com/blogs/news/e-bike-torque-explained-how-much-torque-do-you-need
- Top speed
- 40 MPH
- Claimed range
- 98-175 Miles
- Payload capacity
- 400 LBS
- Assist sensor
- Cadence Sensor
- Throttle
- Thumb Throttle
- Motor, as the maker lists it
- 4500W Peak Brushless Motor
- Pedal assist levels
- 0~5 level pedal assist
power: "4500W Peak"
Source: freeskycycle.com/pages/product-comparison
The maker’s own documents give different figures
“TOP SPEED (PAS) 40 MPH”
Source: freeskycycle.com/products/alaska-pro-m-520
“RANGE 98-175 Miles”
Source: freeskycycle.com/products/alaska-pro-m-520
range: "98-175 Miles"
Source: freeskycycle.com/pages/product-comparison
“LOAD CAPACITY 400 LBS”
Source: freeskycycle.com/products/alaska-pro-m-520
“SENSOR Cadence Sensor”
Source: freeskycycle.com/products/alaska-pro-m-520
“THROTTLE Thumb Throttle”
Source: freeskycycle.com/products/alaska-pro-m-520
“MOTOR 4500W Peak Brushless Motor”
Source: freeskycycle.com/products/alaska-pro-m-520
“PEDAL ASSIST 0~5 level pedal assist”
Source: freeskycycle.com/products/alaska-pro-m-520
Battery and charging
- Battery system
- 48V 45Ah Cell Lithium Battery（18+27Ah）
- Charging time, stated for the machine
- 8-10 hours
- Charger
- US Standard 3A Smart Charger + 2A Smart Charger
- Which pair of packs a bike shipped with
- some units use 18Ah + 23Ah while others use 18Ah + 27Ah
“BATTERY 48V 45Ah Cell Lithium Battery（18+27Ah）”
Source: freeskycycle.com/products/alaska-pro-m-520
charging_time: "8-10 hours"
Source: freeskycycle.com/pages/product-comparison
“CHARGER US Standard 3A Smart Charger + 2A Smart Charger”
Source: freeskycycle.com/products/alaska-pro-m-520
“Why do some units use 18Ah + 23Ah while others use 18Ah + 27Ah?”
Source: freeskycycle.com/blogs/news/freesky-alaska-dual-battery-faq-how-the-system-works-range-explained-battery-questions-answered
Brakes and safety
- Brakes
- 180MM 4-piston Hydraulic Brakes
“BRAKES 180MM 4-piston Hydraulic Brakes”
Source: freeskycycle.com/products/alaska-pro-m-520
Frame and components
- Rear shock
- 150 mm Air Rear Shock
- Front fork
- 120 mm Oil-Sprung Front Fork
- Tires
- 26" x 4" Fat Tires
- Chain
- KMC
- Derailleur
- SHIMANO 7 Speed
- Seat post
- 30.9*350MM Alloy Seat Post
- Display
- LCD Color Display
- Kickstand
- Adjustable Heavy Duty Aluminum
- Frame type
- EMTB
“SUSPENSION 150 mm Air Rear Shock”
Source: freeskycycle.com/products/alaska-pro-m-520
“FRONT FORK 120 mm Oil-Sprung Front Fork”
Source: freeskycycle.com/products/alaska-pro-m-520
“TIRES 26" x 4" Fat Tires”
Source: freeskycycle.com/products/alaska-pro-m-520
“CHAIN KMC”
Source: freeskycycle.com/products/alaska-pro-m-520
“REAR DERAILLEUR SHIMANO 7 Speed”
Source: freeskycycle.com/products/alaska-pro-m-520
“SEAT POST 30.9*350MM Alloy Seat Post”
Source: freeskycycle.com/products/alaska-pro-m-520
“DISPLAY LCD Color Display”
Source: freeskycycle.com/products/alaska-pro-m-520
“KICKSTAND Adjustable Heavy Duty Aluminum”
Source: freeskycycle.com/products/alaska-pro-m-520
frame_style: "EMTB"
Source: freeskycycle.com/pages/product-comparison
Size and fit
- Rider height
- 5'6" ~ 6'8"
- Weight
- 90 LBS
- Total length
- 76.5"
- Wheelbase
- 47.4"
- Standover height
- 28.7"
- Seat height, lowest
- 30.7"
- Seat height, highest
- 40.7"
“Rider Height 5'6" ~ 6'8"”
Source: freeskycycle.com/products/alaska-pro-m-520
rider_height: "5'6" ~ 6'8""
Source: freeskycycle.com/pages/product-comparison
“E-BIKE WEIGHT 90 LBS”
Source: freeskycycle.com/products/alaska-pro-m-520
“Total Length 76.5"”
Source: freeskycycle.com/products/alaska-pro-m-520
“Wheelbase 47.4"”
Source: freeskycycle.com/products/alaska-pro-m-520
“Standover Height 28.7"”
Source: freeskycycle.com/products/alaska-pro-m-520
“Seat Height Min 30.7"”
Source: freeskycycle.com/products/alaska-pro-m-520
“Seat Height Max 40.7"”
Source: freeskycycle.com/products/alaska-pro-m-520
Fitment across the range
- Frame material
- Upgraded 6061 Aluminum
“FRAME Upgraded 6061 Aluminum”
Source: freeskycycle.com/products/alaska-pro-m-520
Warranty, returns and support
- Buying a spare battery
- Alaska Pro 18AH
Source: freeskycycle.com/products/extra-battery-pack
Law and where you can ride
- The federal definition, from the statute
- an electric motor of less than 750 watts (1 h.p.)
“For the purpose of this section, the term 'low-speed electric bicycle' means a two- or three-wheeled vehicle with fully operable pedals and an electric motor of less than 750 watts (1 h.p.), whose maximum speed on a paved level surface, when powered solely by such a motor while ridden by an operator who weighs 170 pounds, is less than 20 mph.”
Source: govinfo.gov/content/pkg/STATUTE-116/pdf/STATUTE-116-Pg2776.pdf
Certification claims
- Certification the manufacturer claims for the battery
- UL2271 Certified by TÜV (18Ah)
UL2271 Certified Dual Battery
“UL2271 Certified Dual Battery FREESKY batteries are rigorously tested to meet the UL-2271 safety standard, ensuring unmatched protection against electrical and structural risks. A combined 45Ah battery provides an impressive range of 98–175 miles on pedal assist, ensuring you can travel farther with confidence.”
Source: freeskycycle.com/products/alaska-pro-m-520
Disputed
“Ebike Safety UL2849 Certified by TÜV Ebike Safety UL2271 Certified by TÜV (18Ah)”
Source: freeskycycle.com/products/alaska-pro-m-520
The same document also states
Certifications
- UL 2849Standard for Electrical Systems for eBikesVerified certification recordIssuer: TÜV SÜD America, Inc.Cert #U14 128702 0012 Rev. 00TÜV SÜD certificate U14 128702 0012 Rev. 00 (UL 2849) — cdn.shopify.com/s/files/1/0605/5188/9131/files/UL2849-Alaska-Pro-M520.pdf
Applies in: US and Canada
Issued to FreeSky's manufacturer, GuangZhou Yansan Science & Technology, on 4 November 2025, covering the M-520. TÜV SÜD's own certificate register lists it as valid. FreeSky publish it on this machine's product page. TÜV SÜD certified it; we did not test it.
- UL 2271Standard for Batteries for Use in Light Electric Vehicle (LEV) ApplicationsVerified certification recordIssuer: TÜV SÜD America, Inc.Cert #U10 128702 0009 Rev. 00TÜV SÜD certificate U10 128702 0009 Rev. 00 (UL 2271) — cdn.shopify.com/s/files/1/0605/5188/9131/files/UL2271-Alaska-Pro-M520-18Ah.pdf
Applies in: US and Canada
Issued to FreeSky's manufacturer, GuangZhou Yansan Science & Technology, on 19 September 2025, covering battery FP4818R0, 48.1 V, 18 Ah. TÜV SÜD's own certificate register lists it as valid. FreeSky publish it on this machine's product page. TÜV SÜD certified it; we did not test it.
Each standard listed is an independent claim about this specific product — one standard does not imply compliance with another.