48V 20Ah Electric Bicycle Battery Pack, Using Grade A Cells Hailong Lithium-ion Battery, For Wide-tire Electric Bicycles.

Product Overview

YC-4820-HLM is an industrial-grade lithium-ion battery pack engineered for professional delivery fleets, cargo e-bikes, and OEM electric bike manufacturers. By utilizing genuine Grade-A 21700 5000mAh cells in a precise 13S4P configuration, this pack provides a substantial 960Wh of high-density energy. Housed in the reinforced 396.5mm × 121.9mm × 62.43mm Hailong Max (G80) enclosure, it delivers the continuous current required by heavy-duty 500W to 1500W motors.

 Technical Specifications

 Core Engineering & Manufacturing Rigor

• Premium 21700 Cell Consistency Protocols: Compared to old 18650 setups, the 21700 platform increases volumetric energy density by 43%. Before matrix assembly, every single cell passes automated sorting machinery: internal resistance variance is strictly restricted to ≤ 2 mΩ, and capacity variance to ≤ 20 mAh. This eliminates any "weakest link" capacity imbalance.

• Pure Nickel Strips & Automated Spot Welding: We completely reject high-resistance nickel-plated steel strips. All internal series and parallel connections are joined using ≥ 99.6% purity pure nickel sheets via automated CNC spot welding. This reduction in electrical resistance cuts heat accumulation by up to 15°C under continuous heavy-duty cargo loads.

• 100% DOD Full Cycle Aging Test: Every finished 48V 20Ah battery pack undergoes a compulsory 100% Depth-of-Discharge (DOD) automated functional aging cycle test. We trace charge/discharge curves and thermal stability to ensure 100% defect-free delivery to destination ports.

Structural & Mechanical Advantages

• Slim Profile Design (62.43mm Depth): While expanding the length to 396.5mm to perfectly pack 52 cells of 21700, we restrict the casing width to 62.43mm. This guarantees comfortable knee and pedal clearance for delivery couriers during high-frequency pedaling.

• Heavy-Duty Slider Base Plate: The multi-point mounting rail base plate redistributes localized shear stress caused by the 4.5kg pack weight on rough city roads, preventing locking bracket cracking or connector dislocation.

• Integrated Fleet Theft-Deterrent: Features an integrated 4-LED flush capacity indicator button and a high-security zinc alloy barrel key lock system to minimize battery theft vectors for rental and commercial operations.

OEM/ODM

• Discharge Output Connectors: Available with genuine Anderson SB50, XT60, XT90, Bullet, or proprietary terminal leads custom-cut to your engineering drawings.

• Global Customs Compliance Support: Every export shipment is accompanied by a full legal clearance documentation package including certified UN38.3, MSDS, CE, and RoHS reports, along with official Maritime/Air Safety Cargo Certificates to guarantee 100% smooth custom clearance.

• MOQ & Manufacturing Schedules: * Sample Order: Minimum 5 units for physical validation (Lead time: 7–10 working days).

  • Bulk Wholesale Orders: 50 to 200 units for active fleet operators or factory integration (Lead time: 20–25 days post commercial payment validation).

FAQ

Q1: What specific brands or grades of 21700 cells do you use in this 48V 20Ah pack?

A: We exclusively utilize brand-new, Grade-A 21700 5000mAh cylindrical cells (such as Eve, Lishen, or premium Tier-1 international manufacturers depending on batch allocation). We never use Grade-B or recycled cells. Every single cell passes rigid OCV, resistance, and capacity metrics prior to matrix welding to guarantee total pack balance.

Q2: Is the 396.5mm Hailong case compatible with standard e-bike frames?

A: This model represents the extended Hailong Max / G80 enclosure format (396.5mm × 121.9mm × 62.43mm). It requires slightly longer lower down-tube clearance than standard lower-capacity alternatives. We highly recommend verifying your bike frame clearance against our downloadable technical dimension drawings before purchasing bulk fleets.

Q3: What certificates do you provide for hazardous goods customs clearance?

A: We provide a full hazardous transport documentation package for cross-border shipping, including certified UN38.3, MSDS, CE, RoHS, and 1.2m Drop Test evaluation results. We also secure official Maritime/Air Safety Cargo Transport Certificates for each batch to guarantee frictionless destination customs processing.

Q4: Can we customize the BMS continuous discharge current and output connectors?

A: Yes, OEM/ODM parameter modification is our primary business capability. The default built-in smart BMS is rated for 30A continuous discharge (ideal for 1000W motors). We can upgrade the internal circuit paths to support 40A or 50A continuous outputs for high-power 1500W+ powertrains based on your hardware design requirements.

Q5: Do you support sample orders, and what is the standard production lead time?

A: We support introductory procurement evaluation with a minimum order quantity (MOQ) of 5 units for physical sample validation. Sample processing takes 7-10 working days, while bulk wholesale production tiers (50-200 units for active fleet operators or assembly plants) are completed within 20-25 days post commercial validation.