CND-553030P 3.7V 400mAh Lithium Ion Polymer Battery with built-in PCM protection ensures superior safety and reliability for Bluetooth speakers, wireless audio devices, and smartphones. Featuring over-charge, over-discharge, over-current, and short-circuit protection, this lightweight (75g), compact (5.8*30.8*32.8mm) high-energy-density battery delivers stable performance with a long cycle life of >500 cycles. Ideal for portable electronics requiring efficient power solutions.More