Dual-Battery Mid-Drive Electric Bike
HKM-1122515 Electric Bike
The HKM-1122515 is a long-range electric pedal-assist bike built around a 1500 W brushless mid-drive motor and a 52 V 55 Ah dual-battery system that stores roughly 2860 Wh. The mid-drive sits at the bottom bracket for balanced weight, and a torque sensor scales motor output to your pedaling so the assist feels natural rather than abrupt. A full charge returns 99-112 mi (160-180 km), the 6061 aluminum frame keeps mass low, a 7-speed drivetrain covers the hills, and hydraulic disc brakes at both ends provide consistent stopping power in wet or dry conditions.
1500 W Brushless Mid-Drive Motor52 V 55 Ah Dual Battery / 2860 Wh31 mph Top Speed99-112 mi Range6061 Aluminum Frame7-Speed DrivetrainHydraulic Disc BrakesTorque-Sensing Pedal Assist
Motor
1500 W
Brushless mid-drive output
Battery
52 V 55 Ah
2860 Wh dual-pack system
Top Speed
31 mph
50 km/h, throttle and assist
Range
99-112 mi
160-180 km on a full charge
Wheels
20 in
Nimble urban wheel size
Frame
6061 Aluminum
Lightweight corrosion-resistant alloy
Overview
The HKM-1122515 is engineered as a do-everything electric bike. The motor is a 1500 W brushless mid-drive unit mounted at the bottom bracket, which places the mass low and central for predictable handling at the 31 mph (50 km/h) top speed. Because it drives through the bike's own gears, the motor always operates in its efficient band and multiplies torque through the cassette for confident climbing.
Energy comes from a 52 V 55 Ah dual-battery configuration totaling roughly 2860 Wh - one of the larger consumer e-bike reserves available. Two independent packs provide redundancy: if one depletes, the other keeps supplying power, and the split also spreads thermal load to protect long-term cell health. A full charge supports 99-112 mi (160-180 km) depending on how much you pedal.
The 52 V architecture is a meaningful detail. For a given power level it draws less current than 36 V or 48 V systems, so resistive losses and heat in the wiring stay lower and voltage holds up better as the pack discharges. The result is steadier performance across the whole state-of-charge window, not just when the battery is full.
Comfort and control hardware match the drivetrain. A 6061 aluminum frame offers a strong, lightweight structure with a low standover thanks to the 20 in wheels. A 7-speed drivetrain gives a usable cadence from a standstill to cruising speed, hydraulic disc brakes provide self-adjusting, weather-resistant stopping power, and a high-contrast LCD shows speed, battery percentage, assist level, trip distance, and odometer at a glance.
Key Features
1500 W Brushless Mid-Drive Motor
The motor sits at the bottom bracket rather than in a wheel hub, centralizing mass for better balance and a lower center of gravity. Brushless construction removes the commutator wear found in older designs, so the motor is quiet and needs almost no routine service. Peak output is available from a standstill, which helps on steep starts and quick merges into traffic.
52 V 55 Ah Dual-Battery System (2860 Wh)
Two independent battery packs combine for roughly 2860 Wh of total capacity. The redundancy means a single pack can fail or deplete without stranding the rider, and splitting the load keeps each pack cooler. Both packs charge together or separately with the included charger, ready for the next long ride.
Torque-Sensing Pedal Assist
A torque sensor reads how hard you are pedaling and scales motor output in proportion, so the assist amplifies your effort instead of overriding it. The transition between levels feels natural, whether you are riding for exercise at low assist or calling for help on a steep grade. This synergy is what makes the bike read like a premium e-bike rather than a basic throttle scooter.
Hydraulic Disc Brakes, Front and Rear
Sealed hydraulic lines actuate both calipers with light, predictable lever effort and self-adjusting pad wear. Oversized, ventilated rotors shed heat on long descents to prevent fade, and the system performs consistently in rain or road spray where rim brakes would lose bite. Power-off levers cut motor drive the instant either is pulled.
7-Speed Drivetrain
A wide-ratio 7-speed cassette gives usable pedaling cadence from walking pace up to cruising speed and makes short work of steep inclines. Shifting complements the assist levels so the motor stays in its efficient range, and the standard parts are easy to service or replace.
20 in Wheels with All-Terrain Tires
The 20 in wheel diameter accelerates quickly thanks to lower rotational inertia and gives a low standover height for easy mounting and dismounting. Wrapped in all-terrain tread, they balance nimble urban maneuverability with stable high-speed tracking on mixed surfaces.
Intelligent LCD Display
A high-contrast LCD stays readable in direct sun and dims for night riding. It shows live speed, battery percentage, assist level, trip distance, and odometer, and the handlebar buttons let you toggle assist modes without taking your eyes off the road. The housing is sealed against dust and light moisture.
Dual-Color Powder-Coat Finish
The frame is offered in gray and red colorways under a durable powder-coat that resists scratches, UV fading, and weather exposure. Combined with the practical 20 in platform, the bike suits commuting, errands, weekend recreation, and fitness riding alike.
Full Specifications
Model
HKM-1122515 | Electric Bike
Frame Material
6061 aluminum alloy, lightweight city geometry
Motor
1500 W brushless mid-drive motor
System Voltage
52 V DC
Battery
52 V 55 Ah dual lithium-ion packs, approximately 2860 Wh total
Charger
Smart charger, 100-240 V input; charges both packs
Charging Time
7-9 hours from empty for the full 55 Ah dual system
Battery Management
Per-pack BMS guards against over-charge, over-discharge, and temperature extremes; active cell balancing
Top Speed
31 mph (50 km/h)
Range Per Charge
99-112 mi (160-180 km); varies with assist level, terrain, rider weight, and tire pressure
Climbing
Mid-drive torque multiplies through the cassette for steep inclines; full output from a standstill
Peak Torque
Substantial low-end torque delivered proportionally to pedal input via the torque sensor
Drivetrain
7-speed cassette, mid-drive driven
Brakes
Hydraulic disc brakes, front and rear, with power-off levers
Ride Comfort
Vibration-damping 6061 aluminum frame geometry; rigid, no rear suspension fitted
Tires
20 in wheels with all-terrain tread
Wheels
20 in alloy rims
Assist Modes
Torque-sensing pedal assist with multiple levels plus throttle
Display
Backlit LCD: speed, battery percentage, assist mode, trip distance, odometer
Throttle
Twist throttle with torque-sensing pedal-assist and selectable assist levels
Weather Protection
Sealed connectors and water-resistant display housing
Intended Use
Urban commuting, recreation, utility, and fitness riding
Construction
Lightweight 6061 aluminum, dual-battery capable
Rider Fit
Low standover 20 in wheels suit a broad range of adult rider heights
Certifications
CE, RoHS; battery cells UN38.3 tested
Battery, Range, and Charging
The 52 V 55 Ah dual-battery system stores approximately 2860 Wh. Most commuter e-bikes ship with 400-700 Wh, so this reserve runs several times above the usual budget. That headroom is what delivers 99-112 mi (160-180 km) and lets you ride a full week of short commutes or a long weekend loop between charges.
Real-world range depends on how much you pedal, rider and cargo weight, tire pressure, terrain, and temperature. Moderate pedal-assist on mixed terrain regularly returns the upper part of the 99-112 mi band; pure throttle-only riding at top speed reduces it. Cold weather temporarily lowers available capacity, which returns as 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 compared with an unheated garage.
Both packs charge together or individually with the supplied charger. A full charge from empty takes about 7-9 hours and the smart system eases into a trickle-maintenance mode once full. Partial top-ups take proportionally less time, so topping up between rides is easier on the cells than running flat and recharging from zero.
Daily Use & Care
- Check tire pressure before each ride; firmer pressure rolls easier on pavement, lower pressure grips on loose surfaces.
- Rinse the frame, rims, and drivetrain with fresh water after riding on salted roads or wet gravel to protect aluminum fasteners.
- Inspect chain tension and lubrication every 100-150 mi, or after any ride through standing water or dust.
- Confirm both brake levers firm up before the grip with no sponginess that would indicate air in the hydraulic line.
- Charge indoors at room temperature and unplug once the indicator turns green rather than leaving it connected for days.
- Keep the display and charge-port covers closed when parked outside so moisture stays out of the connectors.
- Check that the stem and axle hardware are tight before the first ride of each week.
What's in the Box
- 1 x HKM-1122515 electric bike, approximately 85 percent pre-assembled
- 2 x 52 V battery packs (combined 55 Ah / approximately 2860 Wh)
- 1 x 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 User manual and assembly guide
- 1 x LCD display (pre-installed on the handlebar)
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 checking brake alignment. Budget 30-45 minutes with the supplied tools, or have a bike shop verify torque and brake bedding if you prefer.
What is the real range I should plan for?+
Plan for 99-112 mi (160-180 km) under moderate pedal-assist on mixed terrain with a rider near 165 lb (75 kg). Throttle-only riding at top speed reduces that figure. Rider weight, hills, headwinds, low tire pressure, and cold weather all shorten range.
How long does it take to charge both batteries?+
About 7-9 hours from a fully depleted state for the complete 55 Ah dual system with the included charger. The smart system transitions to trickle-maintenance once full, and partial top-ups take proportionally less time.
Is a license or registration required?+
Rules vary by state and locality. A 1500 W motor with 31 mph (50 km/h) top speed may place this bike outside the common three-class e-bike framework in many US jurisdictions, possibly in a moped or motor-driven cycle category. Check your state DMV and local ordinances before riding on public roads or paths.
How do I maintain the hydraulic disc brakes?+
Inspect the pads periodically and replace them when the friction material is under about 1 mm. Bleed and replace the hydraulic fluid every 12-18 months, keep the rotors free of oil, and have the system bled if the lever feels spongy.
Can I pedal it if the battery runs out?+
Yes. The 7-speed drivetrain works independently of the motor. The bike is heavier than a conventional bicycle, so pedaling home unassisted is slower, but entirely possible on flat ground.
Can I ride the HKM-1122515 in the rain?+
Sealed connectors and a water-resistant display housing handle light to moderate rain. The bike is not built for submersion or deep puddles; after wet rides, dry it and lubricate the chain to prevent corrosion, and brake earlier on slick surfaces.
What is the advantage of the 20 in wheel size?+
Smaller wheels accelerate quickly, lower the standover height for easy mounting, and give a compact, maneuverable footprint that is practical for storage and urban riding while still comfortable with quality tires.
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 Battery2860 Wh Dual PackHydraulic BrakesMid-Drive MotorTorque-Sensing Assist
Why Choose the HKM-1122515
Dual-Battery Range Freedom
Two independent packs totaling roughly 2860 Wh deliver 99-112 mi (160-180 km) and redundancy: if one pack depletes, the other keeps you moving. For commuters and weekend riders alike, that reserve removes the constant math of where the next charge is.
52 V Efficiency Advantage
The 52 V architecture draws less current than 36 V or 48 V systems for the same power, cutting resistive loss and heat while holding voltage steady deep into discharge. The practical result is consistent performance from a full pack to a near-empty one.
Natural Torque-Sensing Assist
A torque sensor scales motor output to your pedaling, so the bike amplifies your effort rather than overriding it. Pick a low level for a workout or a higher level for a breather; the transition feels smooth at every setting.
Whisper-Quiet Mid-Drive
Precision bearings and a refined electromagnetic design keep the motor acoustically quiet, so you hear the road and surroundings rather than mechanical noise. Brushless construction also means minimal maintenance and a long service life.
Zero Tailpipe Emissions
Riding replaces short car trips with a clean, quiet alternative. There is no fuel, oil, or exhaust to manage, which suits urban errands and park-loop recreation where noise and emissions matter.
Weather-Resistant Build
Sealed electrical connectors and a water-resistant display housing let the bike handle light rain and road spray as normal use. Charge indoors at room temperature and the electrical system stays reliable through the seasons.
Controls & Indicators
Power Button
Located on the battery pack; hold to switch the system on and off
Mode Buttons
Up and down buttons on the display cycle through pedal-assist levels and zero assist
Twist Throttle
Right-hand grip; proportional response, works with or independent of pedal-assist level
Speedometer
Live speed readout in mph, switchable to km/h in the settings menu
Battery Gauge
Charge indicator plus percentage readout on the LCD
Display Backlight
Toggle the LCD backlight for night riding via the handlebar buttons
Shifter
Right-hand index shifter for the 7-speed rear drivetrain
Pre-Ride Safety Checklist
- Check tire pressure and set it for the terrain: firmer for pavement, lower for loose surfaces.
- Squeeze both brake levers. They should firm up well before reaching the grip, with no sponginess in the hydraulic line.
- Confirm the 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 frame.
- Verify the axle hardware is tight and 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.
- Switch on the display backlight if riding near dusk, and wear a helmet rated for the speeds this bike reaches.
- Confirm the chain is lubricated and tensioned before the first ride of the week.
Quick Troubleshooting
The motor does not engage when I twist the throttle.+
Confirm the display is on and shows charge, the 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 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 on a 31 mph bike with compromised brakes.
The chain skips under hard pedaling.+
The derailleur indexing is likely out of adjustment, or the chain and cassette are worn. Adjust the barrel adjuster a quarter turn at a time to align the indexing; if it skips only in the smallest cogs, the cassette is worn and should be replaced with the chain.
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 conditions, then contact support - error codes map to specific faults in the controller, motor, or throttle circuits.
One battery pack will not charge or hold charge.+
Check the pack connector and key seating first. If one pack loses capacity far faster than the other, the weaker pack may need service; the second pack will keep the bike running in the meantime thanks to the dual-battery design.
Certifications & Standards
The HKM-1122515 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 pack 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 31 mph (50 km/h). Read the manual fully before the first ride and practice throttle control in an open, traffic-free area until the response feels predictable. The torque-sensing assist is powerful - build up speed as your control becomes confident.
- Wear a helmet on every ride. At 31 mph a bicycle helmet is the minimum; many riders choose a certified motorcycle or downhill helmet at these speeds.
- Do not exceed the load capacity, which includes the rider and cargo.
- Check local law before riding on public roads or paths. A 1500 W motor with 31 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.
- Do not ride through water deep enough to reach the battery compartments or motor.
- 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; tires add grip but do not eliminate the risk of losing traction.
HKM-1122515 · 1500 W brushless mid-drive motor · 52 V 55 Ah dual lithium (approximately 2860 Wh) · 31 mph (50 km/h) top speed · 99-112 mi (160-180 km) range · 20 in wheels · 6061 aluminum frame · 7-speed drivetrain · hydraulic disc brakes · torque-sensing pedal assist. Specifications are provided for reference; actual performance varies with rider weight, terrain, tire pressure, temperature, and riding style. Range figures are measured under moderate pedal-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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