This part is a kind of semiconductor called UR18650RX.

Function of this product has Lithium Ion.

Manufacturers : Panasonic Battery

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Some of the text within the PDF file :

UR18650RX Features & Benefits • Super high drain and high capacity model (High power & energy density) • Long, stable power with a flat discharge voltage • Ideal for power tools, Ebikes, and robotics. Lithium Ion Dimensions Specifications Rated capacity(1) Capacity(2) Nominal voltage Charging Weight (max.) Temperature Min. 1950mAh Min. 1950mAh Typ. 2050mAh 3.6V CC-CV, Std. 1370mA, 4.20V, 3.0 hrs Charge: Discharge: Storage: Volumetric: Gravimetric: (3) Energy Max. 18.5 mm 10.0 mm Max. 65.3 mm (–) For Reference Only *With tube (+) 46.2 g 0 to +45°C -20 to +60°C -20 to +50°C 413 Wh/l 155 Wh/kg Energy density(3) (1) At 20°C (2) At 25°C density based on bare cell dimensions Charge Characteristics VERSION 13.02 R1 | Copyright© 2012 SANYO Energy (U.S.A.) Corporation. All [ ... ]

UR18650RX PDF Datasheet Download