This part is a kind of semiconductor called CGR18650CF.

Function of this product has Lithium Ion Batteries.

Manufacturers : Panasonic

Image and pinout :

Some of the text within the PDF file :

PSS series CGR18650CF ■ Dimensions Max. 18.6 5.0 4.5 Voltage（V） 4.0 3.5 3.0 2.5 ※Battery cell is not sold by itself to secure safety. （mm） ■ Typical discharge characteristics 0.2It（430mA） 1.0It（2150mA） 2.0It（4300mA） （＋） 0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 Max. 65.2 Discharge capacity（mAh） 【Test condition】 Charge ： constant voltage/constant current, 4.2V Max.0.7It（1500mA）, 110mA cut-off Discharge ： constant current, 3.0V cut-off Temperature ： 20℃ （－） ※Dimensions of a fresh battery. Voltage（V） 5.0 4.5 4.0 3.5 3.0 -20℃ 2.5 0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 Discharge capacity（mAh） 【 Test condition】 Charge ： constant voltage/constant current, 4.2V Max.0. [ ... ]

CGR18650CF PDF Datasheet Download