18650 Rechargeable Battery Pack 3.7 V High-Density Flat-Top Li-ion Cells for Arduino, IoT and Robotics Projects | Stable Voltage, Low Resistance, Long Cycle Life | Certified UN38.3 CE IEC62133 RoHS | STEM Educational Power Pack

The 18650 3.7 V Li-ion rechargeable battery pack is a high-performance power solution developed specifically for robotics, IoT systems, DIY electronics, and STEM education. Each cell undergoes rigorous testing to verify its rated capacity, internal resistance, and cycle durability, ensuring each cell delivers a true 1200 mAh capacity and a consistent discharge profile. Unlike lower-quality alternatives, this battery pack is designed with accuracy and stability in mind—two qualities crucial for scientific experiments and robotics training. It offers a nominal output voltage of 3.7 V and stable current output under a wide range of loads, making it ideal for Arduino, Raspberry Pi, ESP32, and sensor-based learning kits.

The battery's low internal resistance ensures efficient current flow to motors and LEDs, providing stable operation without voltage drop during movement or lighting. Nickel electrode and spot-welded construction minimize energy loss and enhance safety. An integrated PTC fuse, short-circuit isolation barrier, and pressure vent prevent thermal runaway, ensuring reliable performance in classroom and laboratory environments. This battery pack meets the highest international standards, certified for UN38.3 transportation, IEC 62133 battery safety, and CE/RoHS environmental compliance.
The batteries are coated in heat-resistant PVC for impact and abrasion protection. Their flat-top design ensures compatibility with standard 18650 battery holders and BMS boards, enabling easy integration into custom assemblies. Users can connect batteries in series or parallel to create 3.7 V, 7.4 V, 11.1 V, or 14.8 V battery packs, depending on project requirements. This versatility makes it ideal for robotic vehicles, automated prototypes, drones, and sensor networks that require continuous power.
This 18650 battery pack supports up to 500 CC/CV recharge cycles and retains over 85% of its original capacity even after extended use. Each battery is individually sorted and matched to ensure consistent voltage and capacity within the pack. This attention to detail ensures predictable results in educational environments where data-driven learning is crucial. Students can observe real battery behavior in a controlled environment and learn principles such as Ohm's law, capacity discharge, and energy conversion.

As a sustainable alternative to disposable batteries, this rechargeable battery pack reduces waste and operating costs in schools and research labs. A single battery pack replaces hundreds of disposable batteries, making it an environmentally friendly and cost-effective solution. It embodies the principles of renewable energy and responsible resource utilization, aligning with modern STEM education goals.
In robotics applications, this battery pack provides instantaneous current to motors and servo drives, enabling smooth motion control and responsive navigation. In IoT systems, it provides stable voltage to wireless modules and sensor arrays, ensuring long-term operation and reliable data transmission. Furthermore, this battery pack is ideal for DIY electronics, lighting systems, and research equipment requiring portable power.
With proven capacity, a robust safety architecture, and modular compatibility, this 18650 lithium-ion rechargeable battery pack is a professional-grade solution for students, teachers, and engineers alike. It bridges the gap between teaching theory and practical engineering, providing a realistic demonstration of the workings of modern energy storage technology. This reliable, safe, and sustainable battery pack empowers the next generation of makers and innovators, allowing them to explore science through hands-on learning and responsible energy use.