48V 2000W Dual-Battery Electric Cargo Bike
HKM-4728531 Dual-Battery Electric Cargo Bike
The HKM-4728531 carries a 2000 W brushless motor and two removable 48 V lithium packs in a cargo-oriented street frame. The dual-pack design stretches real-world range well beyond a single-battery bike, while the 37 mph (60 km/h) top speed and 400 lb load rating make it a genuine hauler for errands, deliveries, or a loaded weekend ride. Hydraulic disc brakes, a comfortable upright position, and a rear cargo rack keep every trip controlled and practical.
2000 W Brushless MotorDual 48 V Lithium Packs37 mph Top Speed (60 km/h)40-70 mi Range400 lb Load CapacityHydraulic Disc BrakesRemovable BatteriesCargo Rack
Motor
2000 W
Brushless, 48 V system
Battery
Dual 48 V
Two removable lithium packs
Top Speed
37 mph
60 km/h, throttle and assist
Range
40-70 mi
64-113 km, estimate, dual pack
Tires
Street
Multi-surface street profile
Load Capacity
400 lb
180 kg rider and cargo
Overview
The HKM-4728531 is built around a high-strength cargo frame tuned for a 400 lb total load. The long, stable wheelbase carries a rider plus a loaded rear rack without feeling twitchy, and the upright position keeps you alert in traffic. The frame is rated for a combined rider-and-cargo load of 400 lb, enough for an adult rider plus a full day of gear, groceries, or a delivery load.
Under the frame is a modern electric drivetrain: a 2000 W brushless motor fed by two removable 48 V lithium packs. The twist throttle gives immediate acceleration from a stop, while selectable pedal-assist levels let you add human power to extend the range or help on a grade. The dual-pack layout is what separates this bike from a standard commuter - you get the energy budget for longer trips and a spare pack you can charge while the other is in use.
Real-world range is wide because the bike adapts to how you ride and because it carries two packs. Throttle-only on flat pavement at moderate speed returns the shorter end of the band. Moderate pedal-assist on the same terrain stretches it toward the longer figure. Aggressive throttle use, a heavy load, headwinds, and cold weather all reduce those numbers, while smooth, measured riding pushes them back up.
Comfort and control hardware match the cargo mission. A front suspension fork takes the edge off broken pavement, hydraulic disc brakes at both ends provide consistent, fade-resistant stopping power even with a load, and the stable geometry keeps the bike composed when the rear rack is full.
Key Features
2000 W Brushless Motor
A 2000 W brushless motor delivers strong pull from a stop and steady cruising on flat and rolling terrain, with enough reserve to move a loaded bike. The sealed design keeps road film and dust out of the windings, and the broad power band means smooth acceleration rather than a sudden jerk when you roll on the throttle.
Dual 48 V Lithium Packs
Two removable 48 V lithium packs sit in the frame and lift out with a key for indoor charging. A full recharge from empty takes approximately 6-8 hours per pack on the supplied 2 A charger; because there are two, you can charge one while riding on the other. Two keys are included so you can secure each pack when it is off the bike.
Front Suspension Fork
A suspension fork up front smooths broken pavement and hardpack so the rear tire and your arms deal with less abuse. The tuning is set for all-surface riding, which keeps the steering light and predictable whether you are in a bike lane or on a mixed-use path.
Hydraulic Disc Brakes, Front and Rear
Sealed hydraulic lines actuate both calipers. Lever effort stays light and predictable when the rotors get hot, with no cables to stretch or corrode. Power-off brake levers cut motor drive the instant either lever is pulled - a meaningful safety feature on a 37 mph loaded bike.
Pedal-Assist Drivetrain
A simple chain drivetrain with pedal-assist lets you add human power when you want to extend range or help on a climb. The wide gear range is what lets heavier riders keep moving without overheating the battery on long, loaded pulls.
Street-Profile Tires
The street-profile casing is sized for stable, low-rolling-resistance riding on pavement and firm paths, with enough tread for packed dirt and wet roads. The footprint adds confidence in traffic and on uneven surfaces when the bike is loaded.
LED Headlight and Integrated Brake Light
A bright LED headlight runs off the main pack so there are no separate batteries to keep charged. A brake light that illuminates whenever either brake lever is pulled adds visibility from behind - useful in traffic and at dusk.
Rear Cargo Rack
A sturdy rear rack gives a secure mounting point for a tail bag, grocery crate, or delivery load. Combined with the 400 lb load rating, the bike is set up for real utility trips, not just leisure rides.
Full Specifications
Model
HKM-4728531 | Dual-Battery Electric Cargo Bike
Frame Material
High-strength steel cargo frame, step-over geometry
Motor
2000 W brushless motor, 48 V system
System Voltage
48 V DC
Battery
Dual 48 V lithium-ion packs, removable and lockable
Charger
2 A smart charger, 100-240 V input (per pack)
Charging Time
Approximately 6-8 hours from empty per pack
Battery Cycle Life
Approximately 800 charge cycles to 80 percent capacity
Top Speed
37 mph (60 km/h)
Range Per Charge
40-70 mi (64-113 km), estimate, dual-pack, varies with assist level
Climbing Grade
Up to approximately 25 degrees with a solo rider
Peak Torque
Approximately 65 N.m
Drivetrain
Chain drive with pedal-assist, single-speed rear
Brakes
Hydraulic disc brakes, front and rear, with power-off levers
Suspension
Front suspension fork, rigid rear
Tires
Street-profile tires, multi-surface tread
Wheels
Alloy rims, stainless spokes
Saddle
Comfort saddle with grippy cover
Display
Backlit LCD: speed, battery level, assist mode, trip distance, odometer
Throttle
Twist-grip throttle with selectable assist levels
Lighting
LED headlight, integrated brake-activated tail-light, powered by main battery
Load Capacity
400 lb (180 kg) rider and cargo
Bike Weight
Approximately 85 lb (39 kg) including both packs
Recommended Rider Height
5 ft 2 in to 6 ft 4 in (157-193 cm)
Certifications
CE, RoHS; battery cells UN38.3 tested
Battery, Range, and Charging
The HKM-4728531 runs on two removable 48 V lithium packs, which is what gives it the energy budget of a long-range cargo bike rather than a short-hop commuter. Carrying two packs means you can rotate them: charge one indoors while the other stays on the bike.
Real-world range depends on four variables more than anything else: how much you pedal, rider and cargo weight, tire pressure, and terrain. Throttle-only riding at higher speeds lands closer to the short end of the band. Moderate pedal-assist on the same terrain regularly returns the longer figure. Cold weather below 40 F (4 C) temporarily reduces available capacity by 10-20 percent; it returns once the pack warms up.
Tip: Store the packs between 30 and 70 percent charge if the bike will sit unused for more than a month, and top them up every 4-6 weeks. Charging indoors at room temperature extends usable pack life considerably compared with charging in an unheated garage.
Each pack unlocks with the supplied key and lifts out of the frame in a few seconds, so you can charge them at a desk while the bike stays locked outside. Charging with the packs installed works equally well - the charge ports are accessible without removing anything.
Daily Use & Care
- Tire pressure sets the character of the bike. Run higher pressure on pavement for lower rolling resistance; drop slightly for packed dirt and wet roads.
- Rinse the frame, rims, and drivetrain with fresh water after riding on salted roads or wet gravel. Road film attacks fasteners over time if left in place.
- Check that both axle nuts and the stem bolts are torqued before the first ride of each week, and that the cargo rack hardware is tight.
- Wipe and re-lubricate the chain every 100-150 mi, or after any ride through standing water or dusty conditions.
- Inspect brake pad thickness monthly. Hydraulic pads wear silently until they are gone; replace when the friction material is under 1 mm.
- Charge indoors at room temperature. Unplug the charger once the indicator turns green rather than leaving it connected for days.
- Keep the display and charge port covers closed when the bike is parked outside so moisture stays out of the connectors.
What's in the Box
- 1 x HKM-4728531 dual-battery electric cargo bike, approximately 85 percent pre-assembled
- 2 x 48 V removable lithium battery packs
- 1 x 2 A smart charger with 100-240 V input
- 2 x Battery keys
- 1 x Toolkit with hex wrenches and pedal spanner
- 1 x Pair of folding pedals
- 1 x Rear cargo rack (pre-installed)
- 1 x User manual and assembly guide
Frequently Asked Questions
How much assembly is required out of the box?+
The bike ships approximately 85 percent assembled. Remaining steps are fitting the front wheel, straightening and bolting the handlebar, installing the pedals and saddle, and checking brake alignment. Budget 30-45 minutes with the supplied tools. Have a bike shop check torque and brake bedding if you are not comfortable doing it yourself.
What is the actual range I should plan for?+
Plan for 40-70 mi depending on how much you pedal and which packs you run. Throttle-only riding at higher speeds lands closer to the short end. Moderate pedal-assist on mixed terrain regularly returns the longer figure. Heavier loads, headwinds, hills, and low tire pressure all reduce range.
Is a license or registration required?+
Rules vary by state and locality. A 2000 W motor with a 37 mph top speed exceeds the limits of the common three-class e-bike framework in many US jurisdictions, which may place this bike in a moped or motor-driven cycle category. Check your state DMV and local ordinances before riding on public roads or bike paths.
How long does the battery take to charge?+
About 6-8 hours from fully empty per pack with the supplied 2 A charger. Because there are two packs, you can stagger charging so one is always ready. Partial top-ups take proportionally less time.
Can I pedal it if the batteries run out?+
Yes. The drivetrain works independently of the motor. The bike is heavy at approximately 85 lb, so pedaling home unassisted is slow going, but it is entirely possible on flat ground.
Will the brakes handle the speed and the load?+
Hydraulic disc brakes front and rear are the appropriate specification for a 37 mph bike of this weight and load. Bed the pads in during the first few rides with 10-15 progressive stops from moderate speed to build the friction layer on the rotors. With a loaded rack, brake earlier than you would solo.
How does the dual-battery system work day to day?+
Both packs feed the system together for range; you charge them independently. Many owners keep one pack on the bike and one on the charger, swapping at the end of a ride so the next trip starts full.
Are the batteries removable for indoor charging?+
Yes. Each unlocks with the supplied key and lifts out of the frame. You can also charge them in place through the frame-side charge ports.
Service & Policies
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Every order ships free. Handling Time: 0-1 business days (Monday to Friday). Transit Time: 2-5 business days (Monday to Friday). A tracking number is emailed as soon as the parcel leaves our warehouse.
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24 Months Warranty Service
The product is covered by a 24-month warranty from the delivery date against manufacturing defects. Coverage includes parts and labor; normal-wear items are excluded.
CERoHSUN38.3 BatteryDual 48 V PackHydraulic Brakes400 lb LoadCargo Rack
Why Choose the HKM-4728531
Built to Haul, Not Just Cruise
A cargo frame, a 400 lb load rating, and a rear rack turn this into a practical utility bike rather than a leisure toy. Run errands, move gear, or do a loaded weekend ride on the same machine without adding accessories.
Dual Packs, Real Range
Two removable 48 V packs give the energy budget of a long-range cargo bike, and you can rotate them - charge one indoors while the other stays on the bike. That is what makes daily use practical rather than range-anxious.
Two Ways to Ride
Twist the throttle for immediate acceleration, or pedal with assist to extend the range. Most owners mix both - throttle to get moving from a stop, pedals to stretch the packs on a long, loaded ride.
Simple, Low-Maintenance Drive
A brushless motor and a simple chain drivetrain mean fewer moving parts to service than a mid-drive or combustion setup, and a notably quiet ride through neighborhoods.
Stable When Loaded
The long, stable wheelbase and upright position keep the bike composed with a full rear rack, so a loaded commute feels controlled rather than twitchy.
Built for Daily Use, Not Just Weekends
Sealed electrical connectors, covered and lockable battery compartments, and hydraulic brake lines that cannot corrode in road film all make sense for a bike that gets ridden often and parked outside.
Controls & Indicators
Power Button
Located on the battery pack; hold to switch the system on and off
Mode Buttons
Up and down buttons cycle through selectable assist levels
Twist Throttle
Right-hand grip; proportional response, works independently of assist level
Speedometer
Live speed readout in mph, switchable to km/h in the settings menu
Battery Gauge
Charge indicator plus percentage readout for both packs on the LCD
Light Switch
Long-press the up button to toggle the LED headlight and integrated brake light
Shifter
Right-hand control for the pedal-assist drivetrain
Pre-Ride Safety Checklist
- Check tire pressure and set it for the terrain you plan to ride: higher for pavement, slightly lower for packed dirt or wet roads.
- Squeeze both brake levers. They should firm up well before reaching the grip, with no sponginess that would indicate air in the hydraulic line.
- Confirm both batteries are seated and locked, and that the display shows the expected state of charge.
- Spin both wheels and check that the rims run true and nothing rubs the brake pads or the frame.
- Verify the axle nuts, stem bolts, and cargo rack hardware are tight, and that the headset has no play when you rock the bike with the front brake applied.
- Test the throttle at walking pace in a clear area before riding in traffic or with a loaded rack.
- Switch on the headlight and tail-light if you will be riding near dusk, and wear a helmet rated for the speeds this bike reaches.
- If carrying cargo, confirm the load is secured on the rear rack and within the 400 lb rating before mounting.
Quick Troubleshooting
The motor does not engage when I twist the throttle.+
Confirm the display is on and shows charge, both batteries are locked into place, and both brake levers are fully released - brake cut-off sensors disable the motor while a lever is pulled. If the display shows an error code, note it and contact support.
Range dropped noticeably compared with when it was new.+
First check tire pressure; a soft tire is the most common cause. Then consider temperature - cold reduces available capacity temporarily. If range is down more than 30 percent year-round after many charge cycles, a pack may be approaching the end of its service life.
The brakes feel spongy at the lever.+
Sponginess in a hydraulic system usually means air in the line or a fluid leak. Stop riding and have the system bled and inspected. Do not continue riding a 37 mph loaded bike on compromised brakes.
The chain skips under hard pedaling.+
The drivetrain indexing is likely out of adjustment, or the chain and cog are worn. Adjust the barrel adjuster a quarter turn at a time to align it. If the chain skips only under load, the cog is worn and should be replaced along with the chain.
The front fork rattles over bumps.+
Check that the axle is fully seated in the dropouts and the pinch bolts are torqued. If the rattle persists, the fork may need service - inspect the stanchions for scoring and have a shop rebuild the lowers if needed.
The display shows an error code and the bike will not move.+
Power the system off, wait 30 seconds, and switch it back on. If the code returns, note the exact code and the conditions that produced it, then contact support - error codes map to specific faults in the controller, motor, or throttle circuits.
Certifications & Standards
The HKM-4728531 is produced in a facility operating under an ISO 9001 quality management system. The battery cells and the assembled packs carry the test documentation normally required for lithium-ion transport and sale.
- CE - European Conformity marking covering the electrical assembly.
- RoHS - Restriction of Hazardous Substances compliance for the electronics.
- UN38.3 - Battery transport safety testing, required for lithium-ion shipping by air, sea, and road.
- MSDS - Material Safety Data Sheet available for the battery packs on request.
- ISO 9001 - Quality management system certification held by the manufacturing facility.
Important Safety Notes
This is a high-output electric bicycle capable of 37 mph. Read the manual fully before the first ride and practice throttle control in an open, traffic-free area until the response feels predictable. If you will be carrying cargo on the rear rack, practice solo first - loaded braking distances are noticeably longer.
- Wear a helmet on every ride. At 37 mph a bicycle helmet is the minimum; many riders choose a certified motorcycle or downhill helmet at these speeds.
- Do not exceed the 400 lb (180 kg) load capacity, which includes the rider and all cargo.
- Check local law before riding on public roads or paths. A 2000 W motor with a 37 mph top speed may place this vehicle outside standard e-bike classifications in your area.
- Bed in the brake pads with 10-15 progressive stops during the first few rides before riding at full speed or with a loaded rack.
- Do not ride through water deep enough to reach the motor or the battery compartments.
- Charge only with the supplied charger, indoors, at room temperature, and on a non-flammable surface. Do not leave a charging battery unattended overnight.
- Do not attempt to open, puncture, or modify the battery packs. Damaged lithium packs can vent and ignite.
- Reduce speed substantially on gravel, wet surfaces, and downhill grades; load shifts the handling, so corner gently when fully loaded.
HKM-4728531 · 2000 W brushless motor (48 V) · dual 48 V lithium packs · 37 mph top speed (60 km/h) · 40-70 mi range (estimate) · 400 lb (180 kg) load capacity · steel cargo frame · front suspension fork · hydraulic disc brakes. Specifications are provided for reference; actual performance varies with rider weight, terrain, tire pressure, temperature, and riding style. Range figures are estimates measured under moderate assist on level pavement. This page describes the product only and is not legal advice regarding vehicle classification - confirm local regulations before riding on public roads.
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