The MJ1 is a green-wrapped 18650, with this particular one having a capacity of 3500mAh, one of the higher end amounts for li-ion batteries when by themselves. You can use these flattop batteries in a variety of flashlights, cameras and other devices that take li-ion for power.

Specifications:

• Manufacturer: LG Chemical
• Country of Origin: South Korea
• Chemistry: INR
• Max. continuous discharge current: 10A
• Nominal capacity: 3500mAh
• Nominal voltage: 3.6V
• Discharge end voltage: 2.5V
• Charging voltage: 4.20 +/- 0.05V
• Standard charging current: 1.25A
• Weight: 49.0g