Specs:

• Brand: Samsung
• Model: 40T
• Size: 21700
• Nominal Capacity: 4000mAh
• Nominal Voltage: 3.6V
• Maximum Voltage: 4.2V
• Discharge Current: 30A Maximum Continuous
• Style: Flat Top
• Protected: NO, UNPROTECTED
• Approximate Dimensions: 21.1mm x 70.4mm
• Approximate Weight: 66.8g