Panasonic lithium-ion Battery

specification
Model: NCA103450
Typical capacity: 2350mAh
Minimum capacity: 2270mAh
Nominal voltage:  3.6V
Life cycle: more than 300 time
weight: 38.4g
dimensions: 33.8mm x 48.8mm x 10.5mm

Panasonic
Specification sheet: Download here