Rechargeable Battery & ChargerChina Mica Customized 433030 3.7V Li Polymer Battery 300mAh Lithium Ion Battery with BMS RoHS Ce UL-1643 Un38.3 Approved for Smart Watch GPS Tracker, Find details about China 300mAh Lithium-Ion Battery, 300mAh Li-Polymer Battery from Mica Customized 433030 3.7V Li Polymer Battery 300mAh Lithium Ion Battery with BMS RoHS Ce UL-1643 Un38.3 Approved for Smart Watch GPS Tracker