The NOVEL 551040 Li-Polymer Battery is a slim, lightweight, and rechargeable 3.7V 400mAh battery engineered for compact electronic devices that demand reliable portable power. Its ultra-slim pouch design and high energy density make it an excellent choice for a wide range of space-constrained applications. The battery delivers stable, consistent performance across hundreds of charge cycles, making it a dependable power source for everyday use. This battery is compatible with a broad range of devices, including smart watches, Bluetooth earbuds, fitness bands, GPS trackers, wireless headsets, IoT devices, medical equipment, RC models, and DIY electronics projects. Its lightweight construction makes it particularly well-suited for wearable electronics. Key features include low self-discharge, no memory effect, and safe, reliable performance. Please follow all safety guidelines: do not overcharge above 4.2V or over-discharge below 3.0V, avoid short circuits, keep away from heat and fire, and use only Li-Po compatible chargers. Store in a cool, dry place. Package includes 1 battery unit. NOVEL batteries are designed to deliver reliable, stable, and long-lasting power for a wide range of electronic devices and DIY applications. Built using quality cells and advanced safety features, they provide dependable performance for gadgets, portable electronics, RC toys, CCTV systems, emergency lights, Bluetooth devices, routers, wearable devices, and more. Compact, lightweight, and easy to install, these batteries are manufactured by ELECTROV8 PVT LTD in India and are suitable for everyday power requirements.