Lithium ion (Li-ion) Button battery high energy density, and the voltage is 3.7 V. 

Key Features: 

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1) High operation voltage. 

2) Wide operation temperature range: -20℃~+60℃. 

3) Non-magnetic stainless steel case, hermetically sealed. 

4) No leakage problem. 

Specification: 

Model: LIR2032

Size: D20x H3.2 mm

Nominal Voltage: 3.7 V

Nominal Capacity: 45 mAh

Weight: 2.8 g

Application: 

Bluetooth earphone, flashlight, watches, car key remotes, remote controls, toys and so on.