Developed based on real-world application requirements, this 3.7V 4000mAh power bank is engineered to provide a balanced charging solution for small portable electronic devices such as headphones and watches. From initial design to final validation, this new arrival ——-HPC B1 represents a milestone in our rigorous R&D process, balancing Capacity with weight and size.ns.

Validated Development Process

The core competitiveness of this product stems from our meticulous control over the development process and rigorous screening of cell performance. From project initiation to mass production, every stage is driven by the core requirements of “stability, durability, and compatibility.” In particular, we have devoted significant R&D resources to cell performance testing and solution optimization to ensure that our products meet the quality standards required for mass production.

Core Cell Testing:

• Cycle Life Test:

  Conducted using a 1.0 C5A discharge standard under strictly controlled test conditions (Charging: 0.5 C5A constant-current charging to 4.2 V, followed by constant-voltage charging at 0.02 C5A; Discharge: 1.0 C5A discharge to 2.5V; 30-minute interval between charge and discharge cycles; ambient temperature 20±5°C). After 500 complete charge-discharge cycles, the cell capacity remains at over 80% of its initial capacity, meeting durability requirements.

• Charge/Discharge Current Control:

  During R&D, we precisely tailored the design to meet the diverse needs of B2B scenarios by establishing tiered charging current standards. In low-temperature environments (0°C–15°C), the maximum charging current is set to 0.2C (5A) to prevent cell damage caused by charging at low temperatures. In standard environments (15°C–45°C), the maximum charging current reaches 0.5C (5A), balancing charging efficiency with cell safety; The maximum discharge current is stabilized at 1.0C (5A), ensuring a steady output that meets the power requirements of 3.7V small digital devices such as Bluetooth earbuds, smart wristbands, and small office equipment, thereby preventing device damage caused by unstable current.

• End-to-End R&D Testing:

  During the development of this product, we conducted multiple rounds of testing and optimization focused on cell performance, circuit stability, and structural compatibility. We placed particular emphasis on verifying core metrics such as cell cycle life and charge/discharge stability to ensure consistent performance across every batch of mass-produced products. This provides quality assurance for bulk purchases by enterprises and reduces post-purchase service risks.

Performance & Reliability

Based on standardized R&D processes and rigorous cell testing, it balances practicality with portability：

• Standardized mass production and stable supply:

  With standardized 3.7V 4000mAh specifications and production processes established during the R&D phase, we achieve high mass production efficiency and ensure a stable supply.

• Stable performance and strong adaptability:

  The core battery cells have been validated through 500-cycle lifespan testing, demonstrating outstanding durability; graded control of charge and discharge currents ensures compatibility with usage requirements in various environments.

• Customization support to drive brand enhancement:

  We support customization of corporate logos, exterior color schemes, and packaging; we provide sample shipping services and formal cooperation agreements to guarantee delivery schedules and product quality.

Contact us to discuss your power bank project or customized battery requirements.