Lithium Battery for Flashlight OEM 21700 7.2V 4800mAh

1. Technical Performance and Specifications

The 21700 7.2V 4800mAh Li-ion pack integrates high-capacity NMC cells with a nominal voltage of 3.6V per cell, configured in a 2S1P arrangement to achieve 7.2V output. Key technical attributes include:

Energy Density & Stability: Delivering 34.56Wh total energy, the pack supports continuous discharge currents up to 9.4A (1C rate), with internal resistance ≤20mΩ ensuring minimal voltage sag during high-load operations. This design prevents overheating in high-lumen flashlights, maintaining stable output even under prolonged use.

Safety Protocols: Equipped with PCM protection against overcharge (cut-off at 8.4V), over-discharge (5.6V threshold), and short circuits. Industrial-grade cells undergo UN38.3 certification, with thermal runaway resistance validated up to 130°C, critical for handheld devices exposed to variable environments.

Physical Robustness: With dimensions optimized for compact flashlight housings (typically ≤75mm length), the 21700 format offers 47% higher volumetric energy density than 18650 cells, enabling slimmer designs without compromising runtime.

2. Application-Specific Advantages in Flashlights

Deployed in professional and consumer flashlights, this battery pack demonstrates significant operational benefits:

Extended Runtime: In 2000-lumen tactical flashlights, the 4800mAh capacity provides 4–6 hours of continuous usage, doubling the endurance of legacy 18650-based packs. Field tests show stable voltage retention above 3.0V under peak loads, avoiding unexpected shutdowns during critical scenarios.

Customization Flexibility: OEM suppliers like Shenzhen BAK Technology offer tailored solutions, including variable series configurations (e.g., 10S–14S for voltage-specific models) and compatibility with nickel-strip assembly kits. This modularity allows manufacturers to integrate packs into diverse flashlight form factors, from pocket-sized EDC lights to heavy-duty searchlights.

Environmental Adaptability: Cells operate reliably across −20°C to +55°C ranges, with moisture control (≤20ppm solvent dehydration) ensuring performance in humid or extreme conditions. User reports highlight consistent output in outdoor expeditions, with negligible capacity fade after 500 cycles.

Conclusion: Strategic Value and Future Outlook

The 21700 7.2V 4800mAh Li-ion pack exemplifies innovation in portable lighting, balancing energy density, safety, and customization. As flashlight technology evolves toward higher outputs and miniaturization, this battery format is poised to dominate, with projected 26% annual growth in the consumer electronics segment.