751424PL Lithium polymer battery:( 14*24*7.5 mm ) 3.7V 220mAh , batteries comes with 2Pin 1.25 JST connector for Bluetooth Earphone, Digital Wear Watch, Selfie Stick, TWS charging case etc. Certified quality: Each lithium battery pass safety examination before they leave the facotry. They must pass UN38.3 test standards such as low-high temperature test, impact test, over charging, external short circuit, vibration test etc. It will lower down the risk caused by accident to minumum in production, shipping and your using period. Wide useage: the battery fit for bluetooth earphone, digital wear watch, Selfie Stick, TWS charging case etc. Long life-time: With about 800 times charge and discharge cycles,the battery can work for 1-2 year in normal using. If you don't use the battery often, please running out the battery capacity and full charging the battery once a month. Life time warranty: Every battery from us is of guaranteed quality for life-time. If you have any probelms with the product (caused by product itself), please contact with us for replacement or refund any time. We provide 100% quality product and 24 hours after sales service all the time.