Rechargeable 503030 3.7V 400mAh Lipo Battery for Wireless Bluetooth Earbuds

Rechargeable 503030 3.7V 400mAh Lipo Battery for Wireless Bluetooth Earbuds. Ultra-Thin & Lightweight Design: Merely 5.0mm in thickness, optimizing space for modern micro-wearables and compact smart electronics. Exceptional Low Self-Discharge: Engineered with high-purity Cobalt material, ensuring extended standby time and reducing frequent charging cycles. Premium Safety Standard: Equipped with a precision built-in Seiko IC Protection Circuit Module (PCM) against over-charge, over-discharge, and short circuits.