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Addmotor M-650X vs M-66X Range and Battery Comparison: Same 960Wh, Different Riding Priorities

Battery size is often the first specification buyers compare when shopping for an electric bike. In the case of the Addmotor Motan M-650X and Soletan M-66X, battery capacity does not help much because the two models are exceptionally close. Both use a 48V 20Ah Samsung battery, providing approximately 960Wh of energy. Addmotor rates both bikes for up to 105 miles of range in PAS 1.

That makes this comparison more useful than a simple “bigger battery wins” argument. With battery capacity essentially equal, riders can focus on the factors that actually change real-world energy use: pedal sensor type, riding position, tires, terrain, throttle habits, and intended use.

Parameter Comparison Table

Specification	Motan M-650X	Soletan M-66X
Primary Use	All-terrain / mixed-surface riding	Cruiser / moped-style recreational riding
Motor	750W Rear-Drive Motor	750W Rear-Drive Motor
Peak Output	1,400W	1,300W peak output
Torque	80Nm	80Nm
Battery	48V 20Ah Samsung, 960Wh	48V 20Ah Samsung, 960Wh
Range	Up to 105 miles (PAS 1)	Up to 105 miles (PAS 1)
Top Speed	20 mph	20 mph
Pedal Sensor	Dual torque sensor	Speed sensor
Pedal Assist	7 levels	7 levels
Suspension	80mm oil-spring front + rear oil-spring shock	80mm front suspension + rear shock system
Tires	20 x 4.0 fat tires	20 x 4.0 Kenda GIGAS fat tires
Brakes	Mechanical disc, 180mm rotors	Tektro mechanical disc, 180mm rotors
Payload	300 lbs	300 lbs
Current Listed Price	$1,999	$1,899

What 48V 20Ah Means

Battery capacity can be estimated by multiplying voltage by amp-hours. A 48V 20Ah battery contains approximately 960 watt-hours of nominal energy.

For a fat tire eBike, 960Wh is a substantial battery. Four-inch tires, full suspension, large frames, and 750W motors can all increase energy demand compared with a lightweight commuter bicycle. A large battery helps offset those demands and gives both bikes enough capacity for long recreational rides and extended daily use.

Both the M-650X and M-66X use Samsung-cell battery packs and carry UL 2271 battery certification according to Addmotor's current product information. That gives the two models an unusually even foundation for a range comparison.

Why “Up to 105 Miles” Needs Context

The 105-mile figure is listed for PAS 1. It should be understood as a low-assist estimate rather than a promise that every rider will travel 105 miles per charge.

A heavier rider consumes more energy during acceleration and climbing. Soft tires increase rolling resistance. Strong headwinds matter. Cold temperatures can reduce usable battery performance. Frequent throttle use can drain the battery faster than steady low-level pedal assist. Sand, snow, and steep terrain can also increase consumption dramatically.

Because both bikes start with the same battery capacity and the same official maximum range claim, those real-world variables become more important than the published headline.

M-650X: A Battery Used Through Torque-Based Assistance

The M-650X uses a dual torque sensor. Rather than merely detecting that the cranks are turning, the system measures pedal pressure and adjusts assistance in relation to rider effort.

This can encourage efficient riding because riders who contribute more leg power do not necessarily need the motor to deliver the same level of output at every moment. On rolling terrain, the motor can back off when less help is required and increase support when pedal pressure rises.

The bike still gives the rider seven PAS levels and a half-twist throttle, so energy use can vary widely. A rider using high assist, frequent throttle, low tire pressure, and steep trails can consume the 960Wh battery much faster than a rider using PAS 1 on flat pavement.

The important point is that the M-650X gives active riders a very direct way to influence power consumption through their pedaling.

M-66X: Range in a Cruiser Format

The M-66X uses a speed sensor rather than the M-650X's dual torque sensor. This matches its cruiser personality.

Once pedaling is detected, the system provides assistance according to the selected PAS level. For riders who maintain a steady speed on relatively flat roads, that can be simple and convenient. The M-66X also includes a throttle, so riders can choose how much they want to pedal.

That freedom can affect real-world range. A rider who treats the M-66X like an electric moped and uses throttle frequently will generally consume energy faster than a rider who pedals consistently. On the other hand, a rider who uses lower PAS settings on a flat bike path can take strong advantage of the 960Wh battery.

The M-66X therefore has long-range potential, but the rider's behavior is a major part of the equation.

Fat Tires and Energy Consumption

Both bikes use 20 x 4.0-inch fat tires. Wide tires provide stability, traction, and comfort, but they can also create more rolling resistance than narrow commuter tires.

Tire pressure is one of the easiest ways riders can influence range. Lower pressure increases the tire's contact area and can improve performance on sand, snow, loose dirt, and rough ground. Higher pressure within the recommended range usually rolls more efficiently on pavement.

The M-650X is more likely to be used in soft or loose terrain because Addmotor markets it as an all-terrain model. That means a rider may deliberately use lower tire pressure and consume more energy.

The M-66X is more likely to spend time on paved streets, boardwalks, and casual paths. In those environments, tire pressure can be set for a more efficient cruising balance.

Motor Output and Battery Demand

Both bikes use 750W Rear-Drive Motors, but the published peak figures differ. Addmotor lists the M-650X at 1,400W peak and 80Nm of torque. Published Addmotor material for the M-66X has listed up to 1,300W peak and 80Nm.

Peak power is useful for acceleration and climbing, but it also means the motor is capable of drawing significant energy under load. A rider who repeatedly accelerates hard, climbs steep grades, or uses throttle at high demand can drain the battery much faster than a rider cruising steadily.

This is another reason that a large battery does not guarantee a particular mileage figure.

Range Versus Comfort

Long range only matters if the rider is comfortable enough to use it.

The M-650X combines its battery with full suspension and a more active all-terrain riding position. It is a better match for riders who imagine spending hours moving between pavement, gravel, dirt, and recreational trails.

The M-66X combines the same battery capacity with a long banana-style seat, fat tires, full suspension, and a moped-inspired posture. It is designed for riders who want to cover distance with a relaxed seating experience.

Both approaches can support long rides, but they serve different definitions of comfort.

Price and Battery Value

At the time of comparison, the M-650X is listed at $1,999 and the M-66X at $1,899. Since both provide the same 48V 20Ah battery capacity and the same 105-mile PAS 1 claim, the extra $100 for the M-650X is not buying more battery.

Instead, the difference is tied to its newer all-terrain platform, 1,400W published peak output, dual torque sensor, and trail-oriented suspension design.

The M-66X offers the same battery capacity for less money while focusing on cruiser styling and passenger-friendly seating.

Which One Makes Better Use of 960Wh?

There is no universal answer because the riding styles are different.

For an active rider who pedals consistently and values responsive assistance, the M-650X may make the battery feel more intelligently integrated into the ride. For a recreational rider who values a simple, comfortable cruiser, the M-66X provides the same large energy reserve in a more laid-back package.

Final Thoughts

The M-650X and M-66X are an excellent example of why battery capacity should not be used as the only eBike buying metric. Both offer 960Wh Samsung batteries, UL 2271 certification, and up to 105 miles in PAS 1. The real difference is how each bike encourages the rider to use that energy.

The M-650X turns battery power into responsive, torque-based all-terrain assistance. The M-66X turns the same battery capacity into a comfortable, moped-style cruising experience. Battery size is a tie. Riding philosophy is not.