3.7V 30 mAh / 40 mAh / 50 mAh / 55 mAh / 85 mAh / 95 mAh / 100mAh / 180 mAh / 260 mAh / 300 mAh / 350 mAh / 380mAh / 400 mAh / 440 mAh / 450 mAh Lithium Ion Batteries For Earbuds, Ear dots, Earbuds Case DIY Projects etc - HAC Electronics