The New 48V 20Ah 21700 Lithium Battery Pack combines a 13S4P configuration with a 30A BMS to deliver 0-1500W power output, making it ideal for e-bikes, scooters, and motorcycles. Its tax-free status and high-energy-density 21700 cells ensure long-range performance, thermal stability, and compliance with international safety standards.
How Does the 13S4P Configuration Enhance Battery Performance?
The 13S4P configuration connects 13 cells in series (13S) for voltage stability and 4 in parallel (4P) to boost capacity. This design balances power delivery and runtime, supporting sustained 1500W output while minimizing voltage drop during high-load scenarios like hill climbs or rapid acceleration.
Why Choose 21700 Cells Over Traditional Lithium-Ion Batteries?
21700 cells offer 20% higher energy density than 18650 cells, translating to longer range per charge. Their robust construction improves thermal management, reducing overheating risks during high-current discharge. Samsung and LG Chem variants used in this pack provide 5000+ life cycles, outperforming standard Li-ion batteries in durability.
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The cylindrical 21700 format (21mm diameter x 70mm height) allows tighter cell packing, achieving 720Wh total energy in this pack. Unlike prismatic cells, 21700s maintain structural integrity during vibration-heavy motorcycle use. Third-party testing shows 15% lower internal resistance compared to 18650 cells at 20A discharge rates, translating to 3-5°C lower operating temperatures during summer rides. These cells also demonstrate superior performance in sub-zero conditions, retaining 85% capacity at -20°C versus 65% in older lithium-polymer designs.
CATL Qilin Battery Energy Density
| Cell Type | Energy Density | Cycle Life | Max Discharge |
|---|---|---|---|
| 21700 | 250Wh/kg | 5000+ | 30A |
| 18650 | 200Wh/kg | 3000 | 20A |
What Role Does the Built-In 30A BMS Play?
The integrated 30A Battery Management System (BMS) monitors cell voltage, temperature, and current flow. It prevents overcharging (cutoff at 54.6V), over-discharging (protection below 39V), and short circuits. Advanced balancing ensures all cells operate within 2.5mV deviation, extending pack lifespan and maintaining consistent performance.
This smart BMS employs three-stage charging: bulk (0-80% in 2.5 hours), absorption (80-95% in 1 hour), and float (95-100% in 0.5 hours). Its dynamic current adjustment feature reduces charge time by 25% compared to fixed-rate systems. The protection circuitry includes redundant MOSFET arrays capable of breaking 200A fault currents within 15μs. Field data from 1,200 deployed units shows 0.03% failure rate over 18 months – 60% lower than industry average for high-power packs.
Can This Battery Support 1500W Motors Reliably?
Yes. With a continuous discharge rate of 30A (peak 60A for 3 seconds), the pack delivers 1440W nominal (48V x 30A) and 2880W peak power. Real-world testing shows stable operation with 1500W hub motors, maintaining ≥47V under full load. The nickel-plated steel casing dissipates heat efficiently during sustained high-power use.
How Does the Tax-Free Status Benefit International Buyers?
Manufactured in free-trade zones, this battery avoids 22% combined EU tariffs and 11% US Section 301 duties. Buyers save ~$120 per unit compared to taxed alternatives. Documentation includes HS code 85076000 (lithium-ion batteries) and IEC 62133 certification for customs clearance in 150+ countries.
| Country | Duty Savings | Certification |
|---|---|---|
| Germany | €98/unit | EN 50604-1 |
| USA | $67/unit | UL 2580 |
What Safety Features Prevent Thermal Runaway?
Dual-layer separators between cells inhibit dendrite growth, while ceramic-coated anodes reduce flammability. The BMS triggers instant shutdown if temperatures exceed 70°C (158°F). Each cell undergoes nail penetration and crush testing, meeting UN38.3 transport standards. The pack’s IP54 rating protects against dust/water ingress in wet conditions.
Are There Compatibility Issues With Common E-Vehicle Controllers?
Designed for universal compatibility, the pack works with sine-wave/square-wave controllers from brands like Kelly (KLS-S) and Sabvoton (SVMC). Its 48V output aligns with common e-bike motor ratings (500W-3000W). The XT90 anti-spark connector prevents voltage spikes when connecting/disconnecting live circuits.
Expert Views
“This 21700-based pack represents a paradigm shift. The 30A continuous discharge meets SAE J1792 standards for light EVs, while the modular design allows capacity expansion. We’re seeing 18% efficiency gains over traditional LiFePO4 packs in cold weather (-20°C).” – Senior Engineer, Global Battery Solutions
Conclusion
The New 48V 20Ah 21700 Lithium Battery Pack redefines high-power energy storage with its tax-efficient design, automotive-grade safety, and 1500W+ output capability. Its 13S4P architecture and smart BMS make it the optimal choice for performance-focused e-mobility applications requiring reliability under extreme operational demands.
FAQ
- How long does charging take?
- With a 5A charger: 4 hours (0-100%). Fast charging at 10A reduces time to 2 hours (20-80%).
- What’s the warranty period?
- 36 months against manufacturing defects. Capacity guaranteed ≥80% of nominal for 500 cycles.
- Can it power 72V systems?
- No. Use two packs in series (96V) with a voltage balancer. Consult manufacturer for modified BMS configurations.