The NOVEL 400808 is a compact and lightweight 3.7V 35mAh Lithium Polymer (Li-Po) rechargeable battery, available in a convenient pack of 5. Designed for ultra-small electronic devices, this battery features a stable voltage output and high energy density, making it ideal for replacing worn-out batteries in TWS earbuds and wearable gadgets. The battery comes equipped with solder tabs for straightforward installation. Its dimensions of approximately 8.0mm x 8.0mm x 4.0mm make it perfectly suited for miniature electronics. Compatible with a wide range of Bluetooth earbuds including I7, I8, I9, I10, I11, I12, and I12s models, as well as smart watches, fitness bands, Bluetooth headsets, mini speakers, GPS trackers, IoT devices, and DIY electronics projects. With a long cycle life of 500+ cycles and a low self-discharge rate, this Li-Po battery ensures reliable and lasting performance. Ideal for earbud and smart watch battery replacements, wireless audio device repairs, and electronic prototyping. Please follow all safety instructions and keep away from children. 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.