Panasonic lithium-ion Battery
specification
Model: UR18650ZY
Typical capacity: 2600mAh
Minimum capacity: 2500mAh
Nominal voltage: 3.6V
Life cycle: more than 300 time
weight: 43.3g
dimensions: 18.2mm ｘ 64.8mm
Panasonic
Specification sheet: Download here