EM8 Battery Pack – B Hidden Down-Tube 36V/48V Li-ion

Brand: QingNian
Compatibility: EM8
Mounting Type: Fully hidden in the frame down-tube
Removal & Locking: Down-taken system with double lock
Battery Cells: CN18650 Li-ion, up to 52 cells
Voltage & Capacity Range:
• 36 V 16 Ah (27.5 – 42 V)
• 48 V 13 Ah (36 – 54.6 V)
Charging Time: 5 – 6 h (3 A, DC 2.1 mm connector)
Certifications: CE, UN38.3
Weight: ~3.4 kg

Help me understand it:

• Weight ~3.4 kg: Lightweight design that doesn’t compromise handling or performance.
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  Pros & Cons

  🔹 36V 16Ah (576 Wh)

  Pros:

  • Higher Ah capacity = longer range at lower speeds.

  • Compatible with lower power motors (250W–500W), increasing efficiency.

  • Lower stress on components, generally safer for prolonged battery life.

  • Often easier to find spare parts in budget e-bikes.

  Cons:

  • Less power output (watts = volts × amps).

  • Not ideal for steep hills or performance-oriented use.

  • Slightly lower total energy storage compared to the 48V pack.

  🔹 48V 13Ah (624 Wh)

  Pros:

  • Higher peak power output, better for climbing hills or high-speed riding.

  • More compatible with 500W to 1000W motors.

  • Slightly higher energy storage = more power for acceleration or throttle bursts.

  • Increased efficiency at higher speeds.

  Cons:

  • Slightly lower Ah means shorter range if used at same power output as 36V.

  • May increase wear on components if paired with motors not designed for 48V.

  • More expensive to replace due to higher voltage components.

  Expert Advice Summary

  • Go with 36V 16Ah if:

    • You prioritize longer range, smoother rides, and a more affordable, less powerful setup.

    • Your motor is 500W or less and you're using pedal assist more than throttle.

  • Choose 48V 13Ah if:

    • You want stronger acceleration, better performance on hills or off-road, and are using a motor of 750W or more.

    • You ride at higher speeds or plan to carry heavier loads.

    • QingNian: A specialized e-bike battery brand known for reliability.

    • EM8: Custom-designed to fit perfectly inside the EM8’s down-tube without external brackets.

    • Fully Hidden Mounting: Integrates seamlessly into the frame, preserving the bike’s aesthetics and balance.

    • Down-taken & Double Lock: Allows easy removal for charging or maintenance while providing enhanced theft protection.

    • CN18650 Li-ion (52 cells): Combines high energy density with long cycle life for extended riding range.

    • 36 V 16 Ah / 48 V 13 Ah: Two capacity options to balance weight and range for different riding needs.

    • 5 – 6 h Charging (3 A): Fast recharge using a standard DC 2.1 mm charger.

    • CE & UN38.3: Certified to meet international electrical safety and battery transport regulations.

     

🔋 Battery Comparison: 36V 16Ah vs 48V 13Ah