Comprehensive Maintenance Guide for Shengmilo Electric Bikes: Keep Your Beloved Bike in Pristine Condition

Section 1: Battery Maintenance - The Core of Sustained Range

1. Charging Timing and Frequency

• Adopt a "charge-as-you-use" habit to avoid deep discharging. Charge the battery when the level drops to 5%-10%—never let it drain completely. Over-discharging causes sulfation of battery plates, shortening lifespan.
• For short daily rides (e.g., 15km commutes), charge daily; for longer trips, recharge immediately after use.

2. Charging Duration Control

• Use the original Shengmilo charger, designed to match battery parameters for safety and efficiency. A full charge typically takes 6-8 hours.
• After the charger indicator turns green, allow 1-2 hours of trickle charging for saturation, but never overcharge—this can cause overheating, swelling, or even fire risks, especially in summer when high temperatures accelerate charging.

3. Optimal Charging Environment

• The ideal charging temperature is 25°C.
  • High temperatures speed up internal chemical reactions, causing water loss and reduced lifespan. Charge in a cool, ventilated area, away from direct sunlight.
  • Low temperatures decrease battery capacity. In winter, wait for the battery to return to room temperature (e.g., 30 minutes after outdoor riding) before charging, preferably indoors.

4. Long-Term Storage Care

• For idle periods exceeding 1 month:
  1. Fully charge the battery first.
  2. Recharge every two weeks to prevent deep discharge, which causes irreversible capacity loss due to lead sulfate crystal formation.
  3. Store the bike in a dry, cool, and well-ventilated place to avoid moisture and corrosion.

Section 2: Motor Maintenance - The Powerhouse of Performance

1. Daily Cleaning and Inspection

• Check the motor exterior for debris or dust, especially after rainy rides or muddy routes. Use a damp cloth to wipe the casing (avoid letting water enter the motor).
• Listen for unusual noises: a healthy motor runs smoothly with uniform, soft sounds. Grinding or rattling may indicate bearing wear or rotor issues—inspect immediately.

2. Avoid Overloading

• Respect the model-specific weight limit (e.g., 150kg). Overloading increases motor current, causing overheating and insulation aging.
• Assist with pedaling when climbing hills or starting to reduce initial motor stress.

3. Waterproofing and Moisture Protection

• Keep the motor away from deep water. If crossing water is unavoidable, proceed slowly to prevent splashing. After rain, dry the motor with a cool hairdryer (never hot air) and store in a dry place.

Section 3: Brake System Maintenance - The Guardian of Safety

1. Disc Cleaning

• Use a soft cloth dipped in alcohol or specialized cleaner to remove oil, dust, and pad debris from the disc. Oil residue severely impairs braking efficiency. Avoid abrasive tools to prevent scratches.

2. Brake Pad Inspection

• Replace pads when worn to 1/3 of their original thickness. Check pad-to-disc clearance or compare with new pads. Tighten loose fixing screws promptly.

3. Brake Fluid Check and Replacement

• Maintain fluid level between the min-max marks on the reservoir. A low level may indicate a leak.
• Replace brake fluid every 1-2 years (it absorbs moisture, reducing performance). Use specified fluid and follow the bleeding process to avoid air bubbles.

Section 4: Tire Care - The Foundation of Smooth Riding

1. Tire Pressure Check

• Use a pressure gauge to maintain the standard pressure (marked on the tire side or manual).
  • Overinflation: Reduces traction and causes bumpy rides / 爆胎 (blowouts).
  • Underinflation: Increases rolling resistance, drains battery, and accelerates wear. Check pressure weekly; visually inspect before rides.

2. Wear Inspection

• Examine tread depth regularly. Uneven wear (e.g., one-sided wear or shallow grooves) may signal alignment or brake issues. Replace tires when tread depth drops below 1.6mm for adequate grip and water drainage.

3. Debris Removal

• After rides, remove stones, glass, or nails from the tire surface. Small punctures can be patched, but severe damage requires professional repair or replacement.

4. Tire Replacement

• Replace tires every 2-3 years or after 15,000-20,000km, even with minimal wear—rubber ages, cracking and hardening over time. Use matching 规格 (specifications) and ensure proper installation and balancing.

Section 5: Frame and Component Maintenance - The Devil Is in the Details

1. Body Cleaning

• Wash the frame with water and neutral detergent, avoiding corrosive cleaners. Focus on welds, handlebars, and seat posts to prevent rust. Wax the paintwork after cleaning to protect against scratches.

2. Chain Maintenance

• Lubricate the chain with specialized oil every 100-200km. Apply oil to each link and rotate the crank to distribute it evenly. Avoid excess lubricant, which attracts dirt.
• Check for looseness, rust, or breakage. Tighten the chain via the rear axle; use rust remover before lubricating if needed.

3. Handlebar and Seat Post Adjustment

• Tighten loose handlebars or seat posts immediately. Adjust their height and angle for comfort, then recheck fastenings.

4. Lighting and Electrical System Check

• Verify that headlights, taillights, and brake lights work. Replace bulbs and inspect wires for damage, shorts, or looseness. After rain, dry electrical components with a cool hairdryer before use.

Conclusion