QNUT EC150 Commuter E-Bike

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Brand: QNUT | Official Website: qnutbike.com | After-Sales Support Email: support@qnutbike.com Foreword: Different seasons bring unique environmental challenges to e-bikes—from winter cold and road salt to summer heat and rain, and spring/fall humidity and debris. This manual integrates all-season maintenance essentials, customer frequently asked questions (FAQs), and after-sales guidance tailored to QNUT e-bikes. It aims to help you maintain your vehicle scientifically, ensure riding safety, and extend equipment lifespan. For any questions, feel free to consult us via the official website or send an email to our after-sales support team—we will provide professional solutions. Chapter 1 Core All-Season After-Sales Maintenance Items 1. Battery Management & Maintenance (Year-Round Focus) The battery is the core component of e-bikes, and its performance is greatly affected by temperature and usage habits. Scientific management can effectively reduce wear and extend its service life. Winter (Low Temperature & Road Salt) 1. Pre-Ride Warming: Remove the battery and store it indoors (50–70°F / 10–21°C) overnight to ensure it stays at an optimal operating temperature. If the battery is non-removable, move the entire bike indoors 1–2 hours in advance to pre-warm. Use a dedicated insulated sleeve or thermal cover for the battery during rides to minimize heat loss and prevent sudden power cuts due to low temperatures. 2. Avoid Deep Discharge: Battery activity decreases in winter, and deep discharge (below 30% capacity) accelerates permanent capacity loss. Maintain the battery charge between 30%–80% daily, and recharge promptly after riding—never wait until the battery is fully depleted. 3. Indoor Charging Guidelines: Always charge the battery at room temperature. Ensure the battery temperature rises above 32°F (0°C) before charging—charging below this temperature drastically reduces efficiency and may cause permanent damage to battery cells, which is not covered under warranty. Follow the charging sequence: connect the battery first, then the power source. Unplug the charger immediately after full charge to avoid prolonged trickle charging. Summer (High Temperature & Humidity) 1. Avoid Overheating: Do not park the bike in direct sunlight for extended periods, as high temperatures (above 95°F / 35°C) can damage battery cells. Choose shaded areas for parking, and avoid using high assist mode continuously in extreme heat. 2. Charge with Ventilation: Charge the battery in a cool, well-ventilated area—never charge in a closed car or stuffy space. Avoid charging immediately after riding when the battery is still hot; let it cool down for 30–60 minutes first. 3. Moisture Protection: Protect the battery and charging port from rain and splashes. If the port gets wet, dry it thoroughly with a soft cloth before charging to prevent short circuits. Spring & Fall (Humidity & Debris) 1. Charge Level Maintenance: Maintain battery charge between 40%–80% for daily use. For short-term storage (1–2 weeks), keep it at 50%–60% to balance cell activity. 2. Port Inspection: Regularly check the battery connection port for dust, moisture, or corrosion. Wipe it with a dry cotton swab if needed to ensure a stable connection. 3. Avoid Sudden Temperature Changes & Idle Maintenance: In spring and fall, temperature fluctuations between day and night can cause condensation. Keep the battery indoors when not in use to reduce the impact of temperature swings. Additionally, if the e-bike is not in use temporarily, recharge the battery every 2 months to maintain cell activity and prevent irreversible capacity loss. 2. Riding Habits Adjustment (Reduce Wear Year-Round) Proper riding habits save battery power, reduce mechanical load, and lower the risk of malfunctions across all seasons. 1. Mode Selection: Use Eco mode (low assist) on flat terrain and for daily commutes. Reserve high assist only for steep climbs, headwinds, or icy/slippery sections (winter). In summer, avoid prolonged high assist to prevent battery overheating. 2. Gradual Acceleration & Braking: Sudden throttle use strains the battery, while abrupt braking wears brake pads and rotors. Accelerate and decelerate smoothly to extend component lifespan. 3. Route & Backup Planning: Winter: Plan routes with charging stations or carry a pre-warmed backup battery. Summer: Avoid riding during the hottest part of the day (10 AM–4 PM) when possible. Spring/Fall: Avoid muddy or debris-covered roads to reduce drivetrain wear. 3. Mechanical & Routine Maintenance (Seasonal Focus) Winter 1. Tire Pressure Adjustment: Cold air reduces tire pressure, increasing rolling resistance. Check tire pressure weekly and inflate to the upper limit recommended in the vehicle manual (typically 35–45 PSI; refer to the vehicle label). Inspect for punctures or bulges after inflating. 2. Drivetrain Lubrication: Use winter-specific lubricants (low-temperature resistant, anti-caking) to prevent chain stiffness. Clean road salt and debris from the chain after riding to avoid rust. Replace severely rusted chains promptly. 3. Brake Efficiency Check: Ensure brake pads are clean and responsive. Clean rust from rotors with a dedicated cleaner. Allow for longer stopping distances in wet/snowy conditions. Summer 1. Tire Pressure: High temperatures increase tire pressure. Check pressure every 3–5 days and adjust to the recommended range (do not overinflate) to prevent blowouts. 2. Cooling System Inspection: For e-bikes with motor cooling systems, check the cooling fan and vents for dust and debris. Clean them regularly to ensure proper heat dissipation. 3. Brake Cooling: Avoid continuous hard braking in high temperatures, as this can cause brake fade. Let brakes cool down periodically during long rides. Spring & Fall 1. Tire & Drivetrain Cleaning: Spring rain and fall leaves can leave mud and debris on tires and chains. Clean the drivetrain weekly with a brush and mild detergent, then reapply all-purpose lubricant. 2. Brake Pad Inspection: Humidity can cause brake pad degradation. Check pad thickness monthly—replace if less than 1mm. Wipe rotors to remove moisture and dust. 3. Frame & Component Check: Inspect the frame for scratches or dents (more common in fall with fallen branches). Tighten loose bolts on handlebars, seatposts, and pedals. 4. Structural Protection (Seasonal Adaptation) 1. Winter: Install weatherproofing around the battery compartment to block moisture and wind chill. Apply silicone-based grease to bolts and pivot points to prevent freezing. 2. Summer: Use a UV-protective cover for the bike when parked outdoors to prevent frame fading and battery damage from sunlight. Apply a light coat of wax to the frame to repel rain. 3. Spring & Fall: Use a fender to prevent mud splatters on the battery and electrical components. Apply anti-rust spray to metal parts (especially after rainy days) to prevent corrosion. 5. Safety & Visibility (All Seasons) 1. Visibility Enhancement: Winter/Fall: Short daylight hours require high-visibility clothing (reflective vests) and LED lights. Summer/Spring: Use bright lights for early morning or evening rides, and wear light-colored clothing for visibility. 2. Battery & Component Monitoring: Year-round: Watch for battery swelling, leakage, or abnormal charging times. Check for unusual noises from the motor or drivetrain—contact after-sales immediately if issues arise. 3. Seasonal Gear: Winter: Use anti-slip tires or tire chains for icy roads. Summer: Wear breathable gear and use a bike cover to protect from rain. Spring/Fall: Carry a light rain jacket and a small tool kit for emergency repairs. Chapter 2 Frequently Asked Questions (FAQs) & After-Sales Answers A. Battery-Related Questions 1. Q: My QNUT e-bike’s range drops in winter/summer—Is this a malfunction?A: Reduced range in extreme temperatures is normal for lithium-ion batteries. In winter (32°F/0°C), range drops to 60%–70% of normal; in summer (above 95°F/35°C), range may decrease by 10%–20%. Alleviate this by pre-warming/cooling the battery, adjusting assist modes, and avoiding extreme temperatures. If range drops by over 50%, email support@qnutbike.com with your model and usage details for testing. 2. Q: The battery won’t charge in cold outdoor temperatures—What should I do?A: The battery’s protection mechanism activates below 32°F (0°C) to prevent cell damage. Bring the battery indoors to warm to 50°F (10°C) (1–2 hours), then recharge. If charging still fails, contact after-sales to check the port or battery. 3. Q: How to store the battery in different seasons?A: Winter/Summer: Store indoors (50–70°F/10–21°C) at 50%–60% charge. Avoid direct sunlight or freezing temperatures. Spring/Fall: Same charge level, store in a dry, well-ventilated area. For long-term storage (over 1 month) or temporary idleness, recharge the battery every 2 months to maintain 50% capacity and preserve cell health. 4. Q: The battery is swelling or leaking—Is this covered under warranty?A: Swelling/leakage is abnormal. Stop use immediately, keep away from heat, and do not touch leaked fluid. Send photos, model, and purchase date to support@qnutbike.com. QNUT batteries have a 2-year warranty for normal use; damage from extreme temperatures or misuse is excluded. We will provide replacement/repair options. B. Mechanical Component-Related Questions 1. Q: What lubricant should I use for the chain in different seasons?A: Winter: Use winter-specific low-temperature lubricants (anti-caking). Summer/Spring/Fall: Use all-purpose bicycle lubricant (waterproof for rainy seasons). Avoid heavy oil in summer, as it attracts dust. You can purchase QNUT-recommended lubricants via the official website, and our after-sales team is available via email to provide product selection guidance. 2. Q: The tires keep losing/gaining pressure with seasons—Is this normal?A: Yes. Cold air reduces pressure (winter), hot air increases it (summer). Check winter pressure weekly, summer pressure every 3–5 days, and adjust to the manual’s range. If pressure changes drastically in 1–2 days, check for punctures and contact after-sales for repair. 3. Q: Brakes feel soft in rain (spring/fall) or fade in heat (summer)—How to fix?A: Rain: Wipe rotors with a dry cloth; check for moisture in hydraulic lines. Heat: Avoid continuous hard braking; let brakes cool. If issues persist, contact QNUT after-sales for pad replacement or line adjustment. C. Riding Performance & After-Sales Service Questions 1. Q: The bike lacks power in extreme temperatures—Is this a fault?A: Slight power reduction in winter (cold battery/motor) or summer (overheating protection) is normal. Improve performance by adjusting assist modes, cooling/warming the battery, and maintaining tire pressure. Severe power loss with noises/vibrations may indicate a motor fault—email after-sales for troubleshooting. 2. Q: Can after-sales repair components corroded by road salt (winter) or moisture (spring/fall)?A: Yes. QNUT provides online after-sales support for corroded components—our team will guide you through cleaning, rust removal, and lubrication steps via email. For severely corroded parts that need replacement, we offer official accessories for purchase via the website and provide detailed installation tutorials. Rinse components with clean water after riding in salt/mud, then dry thoroughly to reduce corrosion. 3. Q: How to contact QNUT after-sales for seasonal issues? What information is needed?A: All QNUT after-sales services are handled online. You can contact us via: ① Email: support@qnutbike.com; ② Official website (qnutbike.com) – submit a request in "After-Sales Support". Provide your model, purchase date, fault description (photos/videos help), and usage environment (e.g., winter snow, summer heat). We respond within 24 hours with remote troubleshooting guidance, maintenance tutorials, or accessory replacement solutions. 4. Q: Does QNUT offer seasonal maintenance services? What are the costs?A: Yes, we provide online seasonal maintenance support. Our services include winter (battery testing guidance, anti-rust tips), summer (cooling system check tutorials, tire inspection steps), and spring/fall (cleaning, bolt tightening instructions). Bikes under 1 year old get free personalized online maintenance guidance. For accessory replacement required during maintenance, pricing varies by model—email support@qnutbike.com or check the official website for details. Chapter 3 After-Sales Support & Service Instructions A. After-Sales Contact Information • Official Support Email: support@qnutbike.com (response within 24 hours; delayed on holidays) • Official Website: qnutbike.com (download maintenance manuals, submit fault requests, and access online after-sales resources in the "After-Sales Support" section) B. Warranty Coverage 1. Warranty Period for QNUT E-Bike Core Components: 2 years for batteries and motors, 1 year for controllers, 3 years for frames. Warranty covers quality issues under normal use; excludes damage from extreme temperatures, misuse, self-disassembly, or force majeure. 2. Normal seasonal wear (battery range reduction, tire pressure changes, lubricant degradation) is not covered. After-sales offers paid inspection and maintenance for these issues. C. All-Season Maintenance Tips 1. Monthly Comprehensive Check: Contact our after-sales team via email or the official website for remote guidance on inspecting batteries, motors, brakes, and drivetrains, addressing potential issues in advance with step-by-step tutorials. 2. Seasonal Cleaning: Winter: Remove road salt weekly. Summer: Clean dust from vents. Spring/Fall: Wash off mud and leaves to prevent corrosion. 3. Extreme Weather Avoidance: Avoid riding in temperatures below 14°F (-10°C) or above 104°F (40°C), as this causes irreversible component damage. QNUT reserves the right to interpret this manual. For maintenance questions or after-sales needs, please contact us anytime—we are committed to providing quality service. Wish you a safe and smooth ride all year round! Compiled by QNUT Brand Operations Department

Welcome to Qnutbike (qnutbike.com). To ensure a seamless shopping experience from pre-purchase inquiries to after-sales support, we have compiled this pre-sales notice. It clarifies our service policies, mandatory service request requirements, and key pre-purchase considerations. Please review these details carefully to avoid misunderstandings and protect your legitimate rights. 1. Order Information Retention All Qnutbike after-sales services (warranty claims, refunds, order inquiries) require strict order verification. Upon ordering, customers must immediately store the Order Number and Original Tracking Number securely (e.g., dedicated email folder, encrypted notebook). The Order Number is in your confirmation email and Qnutbike account “Order History”. Our logistics partner (e.g., DHL, UPS) will send the Original Tracking Number via a separate shipping email. These details are indispensable for verifying purchases, tracking shipments, and initiating services. Do not share the Order Number with unauthorized parties to prevent fraud. 2. Our Service Commitments 2.1 24/7 Customer Support Qnutbike provides 24/7 professional support for pre and post-purchase inquiries, including product specifications, local regulation compliance, shipping timelines, and payment methods. For assistance, email support@qnutbike.com with your full name, contact information, and specific product model (if applicable). Our multilingual team responds within 2-4 business hours (including holidays/weekends) with accurate answers. Clear inquiries avoid unnecessary delays. 2.2 1-Year Warranty Each Qnutbike electric bike has a 1-year limited warranty, effective from the delivery date (per logistics records). It covers material and workmanship defects (e.g., faulty wiring, defective batteries, loose components) under normal use. Exclusions include wear and tear, accident damage, improper use, unauthorized modifications, and neglect of manual-specified maintenance. To claim warranty, submit required documents (Section 3) and return the product (with original accessories) in its original condition (excluding normal wear). 2.3 30-Day Refund Policy Qnutbike offers a 30-day money-back guarantee for eligible orders, allowing returns if the unused, undamaged bike (with original packaging/accessories) fails expectations. Submit refund requests to support@qnutbike.com within 30 days of receipt, along with verification materials (Section 3), and await a Return Merchandise Authorization (RMA) number—returns without an RMA are rejected. Customers bear return shipping costs unless due to verified defects or shipping damage. Refunds (processed in 5-7 business days post-inspection) take 3-10 days via your original payment method. 3. Verification Document Requirements All service requests require complete, valid verification documents for timely processing; incomplete materials cause delays or rejection. Prepare the following before contacting support: • Order Number: 8-12 digit identifier in the confirmation email, linking to your purchase details. • Original Tracking Number: Logistics partner (e.g., DHL, UPS) code for shipment tracking and issue verification. • Photos/Videos: High-quality, unedited visuals as follows:    Defect claims: Multi-angle shots (including visible serial number) of the defect and entire bike. • Refund requests: Clean, (if applicable) assembled bike, accessories, and packaging (no damage/missing parts). • Shipping damage: Document packaging and bike damage immediately; do not discard packaging or assemble the bike. Photos/videos must be 1080p, well-lit, and unobstructed. Blurry, edited visuals or those with overlays/filters delay verification and may be deemed tampering. 4. Additional Important Notes • Check spam/junk folders for Qnutbike emails; add support@qnutbike.com to contacts for delivery. • Review full warranty/refund terms on qnutbike.com (“Customer Service”) for detailed exclusions and limitations. • Confirm product compliance with local regulations before ordering; Qnutbike is not liable for non-compliance. • Services require verification documents; third-party purchases are only valid if from authorized retailers. • Warranty applies to direct/authorized retailer purchases; parallel imports are uncovered, with no parts/repairs available. • Submit unedited, multi-angle visuals for faster verification; respond promptly to additional requests. • Payment security: Qnutbike uses encrypted gateways and never requests sensitive data via email. Verify suspicious requests immediately. • Confirm delivery address accuracy; address changes are only possible within 24 hours of ordering. • Inspect the bike upon receipt; report damage/defects with visuals within 48 hours to preserve warranty/refund eligibility. Qnutbike is committed to reliable products and professional service. This notice ensures transparent shopping by clarifying our policies. Your cooperation in providing verification documents enables efficient issue resolution. Thank you for choosing Qnutbike. For further assistance: support@qnutbike.com | Website: qnutbike.com