EC1 /EM5 /EM6 Battery Pack – NewQingNian B Hidden Down-Tube 36V/48V Li-ion

Brand: NewQingNian
Compatibility: EC1 / EM5 / EM6
Mounting Type: Fully hidden in the frame down-tube
Removal & Locking: Down-taken system with double lock
Battery Cells: Samsung 21700 Li-ion, up to 40 cells (10S4P for 36V / 13S3P for 48V)
Voltage & Capacity Range:
• 36 V 20 Ah (27.5 – 42 V) – ~720 Wh
• 48 V 15 Ah (36 – 54.6 V) – ~720 Wh
Charging Time:
• 36V 20Ah: 6–7 h (3A, DC 2.1 mm connector)
• 48V 15Ah: 5–6 h (3A, DC 2.1 mm connector)
Certifications: CE, UN38.3
Weight: ~3.9 kg

Help me understand it:

Weight ~3.9 kg: Balanced energy capacity with manageable weight for both urban commuting and off-road riding.

Pros & Cons

🔹 36V 20Ah (~720 Wh)

Pros:

• Higher Ah capacity = longer range at moderate speeds.

• More efficient with lower power motors (250W–500W).

• Lower stress on components, extending battery life.

• Ideal for endurance-focused riders and pedal-assist usage.

Cons:

• Lower peak power compared to 48V.

• Less suitable for aggressive hill climbs or heavy load acceleration.

🔹 48V 15Ah (~720 Wh)

Pros:

• Higher peak power output = better for climbing hills and high-speed riding.

• Works well with motors from 500W to 1000W.

• Stronger acceleration and better performance under heavy loads.

• More efficient at maintaining speed on long, fast rides.

Cons:

• Lower Ah means slightly shorter range at the same power consumption as 36V.

• Can increase wear on components not rated for 48V.

• Slightly more expensive to replace due to higher voltage parts.

Expert Advice Summary

Go with 36V 20Ah if:

• You prioritize longer range, smoother rides, and energy efficiency.

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

Choose 48V 15Ah if:

• You want stronger acceleration, better climbing ability, and responsive off-road performance.

• You ride at higher speeds or often carry heavier loads.

NewQingNian: A specialized e-bike battery brand known for reliable, high-performance packs.
EC1 / EM5new / EM6new Compatibility: Designed to fit perfectly inside the frame’s down-tube without external brackets.
Fully Hidden Mounting: Maintains the bike’s clean look and balanced handling.
Down-taken & Double Lock: Quick removal for charging or maintenance with enhanced theft protection.
Samsung 21700 Li-ion (40 cells): High energy density and long cycle life for extended range.
36 V 20 Ah / 48 V 15 Ah: Two balanced capacity options to suit endurance or power-oriented riders.
CE & UN38.3: Certified for international electrical safety and safe battery transport.

🔋 Battery Comparison: 36V 20Ah vs 48V 15Ah