Heybike Saturn Review: Dual-Battery Moped eBike Test

Some eBike reviews begin with a spec sheet. TailHappyTV began by twisting the throttle, pointing the Heybike Saturn toward steep hills, loose sand, and open streets, and seeing what happened.

The video opens with a brief nod to the Heybike x Spurs partnership before getting into the ride. After testing the Heybike Saturn, the reviewer described it as a “gentle, chill, pretty high-speed cruiser” with solid construction and impressive value.

His biggest recommendation was equally direct: riders planning to use the throttle frequently, travel farther, or carry a passenger should seriously consider the dual-battery version.

The speed, range, and hill-climb results below reflect TailHappyTV’s test conditions. Actual performance varies with rider weight, speed, terrain, weather, load, battery condition, and local settings.

A Cruiser First, a Bicycle Second

Saturn is a long range moped style ebike built around relaxed street riding. It has pedals and five pedal-assist levels, but TailHappyTV viewed it primarily as a throttle-first, single-speed moped rather than a conventional bicycle.

That character becomes obvious as soon as the bike starts moving. The acceleration felt smooth and controlled instead of delivering an abrupt launch. The reviewer particularly liked the full twist throttle, which made it easy to settle into a steady cruising speed.

He also found the motor unusually quiet and smooth, saying its power delivery felt more like a direct-drive motor than a typical geared hub motor. That was his riding impression rather than an official description of the motor’s internal design.

Why Two Batteries Change the Ride

The single-battery Saturn uses one 52V 18.4Ah battery rated at 956.8Wh. The dual battery moped ebike version adds a second matching battery, bringing total capacity to 52V 36.8Ah, or 1,913.6Wh.

Single-battery range: 30–50 miles
Dual-battery range: 60–100 miles
Battery capacity: 956.8Wh per battery
Charger: 58.8V / 3A
Review charging estimate: Approximately six hours per battery

Each battery has its own physical power switch. Riders should confirm that the installed batteries are switched on and follow the charging instructions in the Saturn manual.

TailHappyTV recommended the dual-battery version because higher speeds, sustained throttle use, steep hills, and passenger weight can consume battery capacity quickly. For riders looking for a long range electric moped bike, the second battery provides more flexibility and a larger reserve for the ride home.

The Full-Throttle Range Test

The reviewer rode 18.23 miles in one hour and five minutes while making extensive use of full throttle. At the end of the test, the display showed 53.5V, and he estimated that approximately 60% of the battery remained.

He also reported that the bike continued to perform consistently as the displayed battery level dropped. This was an aggressive real-world ride, not a controlled maximum-range test, so the result should not be extrapolated into a guaranteed total range.

How Fast Did the Saturn Go?

Saturn uses a 52V hub motor rated at 1,000W, with up to 1,800W of peak power and 95 N·m of torque.

For riders comparing a 1000W moped ebike with an 1800W electric moped, the distinction matters: 1,000W is Saturn’s rated motor output, while 1,800W is its peak output.

The factory speed setting is 28 mph. Where local regulations permit, the maximum setting can be adjusted up to 40 mph through the display or Heybike App.

During TailHappyTV’s test, the approximately 200-pound reviewer maintained around 34–35 mph while sitting upright in windy conditions. He believed a lighter rider or a rider traveling with a tailwind could get closer to 40 mph.

Real-world speed varies, and higher settings are not legal for electric bicycle use in every location. Riders should check local regulations and become familiar with the bike at lower speeds first.

Climbing a 20% Grade on Throttle Alone

The Saturn completed a 20% grade using throttle power alone. On the reviewer’s 12% “California hill” test, it reached the top in approximately 38 seconds while traveling at around 23 mph.

The results show useful climbing ability for paved streets, especially once the bike is already moving. The smooth acceleration also makes the power easier to manage when starting on level ground.

Where It Struggled

Loose sand was a different story. The wide tires looked ready for the challenge, but the reviewer found that Saturn did not produce enough low-speed torque to move confidently through very soft sand.

This is an important reminder for anyone shopping for a fat tire moped ebike. Wide tires improve stability and cushioning, but they do not automatically turn a street cruiser into a dirt bike.

Full Suspension Made for the Street

Saturn is a full suspension moped ebike with a 140 mm dual-crown front fork and 55 mm of rear suspension travel. Twin rear coil shocks help absorb uneven pavement, expansion joints, and rough neighborhood roads.

TailHappyTV considered the suspension better suited to street riding than demanding off-road use. The setup gives Saturn a stable and comfortable cruising feel without pretending that it is a lightweight trail bike.

The test bike used 20 × 4-inch Chaoyang tires mounted on spokeless magnesium alloy wheels. The combination adds to Saturn’s moped appearance and creates a planted feel on paved roads.

Brakes and Controls That Match the Bike

A bike this large and fast needs dependable stopping control. Saturn uses two-piston hydraulic disc brakes with 180 × 2.0 mm rotors and motor cut-off. TailHappyTV considered the braking setup above average for this price range.

Rider controls and visibility features include:

Full twist throttle
Five pedal-assist levels
TFT color display with battery-voltage information
Heybike App compatibility
Bright front headlight with electric horn
Rear brake light and turn signals

Stopping distance still increases with speed, passenger weight, cargo, wet roads, and downhill riding. Riders should practice braking in a safe area before carrying a passenger or using higher speed settings.

Built for Passenger Cruising

One of Saturn’s strongest qualities is how naturally it works as a passenger-friendly utility moped ebike.

TailHappyTV’s test bike included passenger footpegs, a rear passenger seat, a rear rack, mirrors, and a phone storage compartment. These details make the bike suitable for relaxed neighborhood rides, local errands, and casual two-person cruising.

For riders searching for a moped ebike with rear rack capacity, Saturn provides useful space for passenger or cargo accessories. Its official maximum payload is 330 pounds, including the rider, passenger, cargo, and installed accessories.

The reviewer is 6'5" tall with a 34-inch inseam and was able to ride the Saturn. However, Heybike officially lists the recommended rider height as 5'3"–6'3". Taller riders should treat his experience as an individual fit test rather than an official fit guarantee.

Passenger regulations vary by location. Riders should confirm local rules, remain within the payload limit, and ensure that both riders use appropriate safety equipment.

Build Quality and UL Certification

TailHappyTV praised Saturn’s construction and considered it a strong value. He also noticed a UL certification label on the frame. Heybike’s official specifications list Saturn as UL 2849 certified.

The official equipment package includes front and rear fenders, a rear rack, rear mirrors, front and rear lighting, turn signals, and an electric horn. The front fender and rear rack may require installation after delivery.

Owners should follow the official assembly instructions, check all fasteners, test the brakes, and complete a basic safety inspection before the first ride.

The Tradeoffs to Consider

It is heavy: The single-battery Saturn weighs approximately 103 pounds, while the dual-battery version weighs approximately 115 pounds. This heavy duty ebike may be difficult to carry upstairs or load into a vehicle.
Throttle use affects range: Higher speeds, hills, passenger weight, and frequent full-throttle riding consume more energy.
It is not designed around unassisted pedaling: Saturn feels more like a moped with pedals than a lightweight bicycle.
Soft terrain is a weakness: The review showed limited performance in loose sand.
Higher speed settings require caution: The unlocked setting may not comply with electric bicycle laws in every location.
Storage requires planning: Its size and weight make ground-level storage much more practical.

Who Should Choose the Heybike Saturn?

Saturn is worth considering for anyone looking for a moped ebike for adults with relaxed ergonomics, passenger capability, strong paved-road performance, and the option of extended range.

It is particularly suitable for:

Street and neighborhood cruising
Longer recreational rides
Riding with a passenger
Local errands requiring a rear rack
Riders who prefer a full twist throttle
Ground-level garage or home storage

Someone looking for a lightweight moped ebike for commuting may find Saturn difficult to carry or store. For riders who have suitable storage and prefer motor-powered cruising, the combination of battery capacity, suspension, passenger features, and smooth power delivery makes a convincing case.

Final Takeaway

TailHappyTV’s test showed that Saturn is at its best when treated as a comfortable street cruiser. It accelerates smoothly, climbs paved hills confidently, supports passenger use, and maintains consistent performance during demanding throttle riding.

The dual-battery model is the more practical choice for longer routes, higher speeds, and passenger rides. The single-battery version can still work for shorter local trips, but riders should expect sustained throttle use to reduce its available range more quickly.

Watch TailHappyTV’s complete Heybike Saturn review for the full speed, hill, sand, and range tests.

Explore the Heybike Saturn to see current configurations, included accessories, colors, pricing, and official specifications.

Frequently Asked Questions

Is Saturn a long range moped style ebike?

Yes. Heybike lists an official range of 30–50 miles for the single-battery version and 60–100 miles for the dual-battery version. Actual range varies with speed, throttle use, rider weight, passenger or cargo load, hills, weather, and tire pressure.

Should I choose the single- or dual-battery Saturn?

The single-battery version may be sufficient for shorter local rides. TailHappyTV recommended the dual-battery version for frequent throttle use, passenger rides, higher speeds, and longer routes.

How fast does the Heybike Saturn go?

Saturn is set to 28 mph by default and can be adjusted up to 40 mph where permitted. TailHappyTV reached approximately 34–35 mph in windy conditions with a 200-pound rider sitting upright.

Is Saturn suitable for off-road riding?

Its full suspension and 20 × 4-inch tires can help on rough pavement and moderate uneven surfaces. TailHappyTV considered it better suited to street riding and reported weak performance in loose sand.

Can the Heybike Saturn carry a passenger?

TailHappyTV tested a Saturn equipped with a passenger seat and footpegs. The official maximum payload is 330 pounds, including both riders, cargo, and accessories. Confirm the current product configuration and local passenger laws before riding with another person.

Is Saturn suitable for tall riders?

The 6'5" reviewer with a 34-inch inseam was able to ride it, but Heybike’s official recommended rider-height range is 5'3"–6'3". Taller riders should assess fit and control before purchasing.