This part is a kind of semiconductor called APR18650M1A.

Function of this product has High Power Lithium Ion.

Manufacturers : A123Systems

Image and pinout :

Some of the text within the PDF file :

High Power Lithium Ion APR18650M1A A123Systems’ lithium ion rechargeable APR18650M1A cell is capable of very high power, long cycle and storage life, and has superior abuse tolerance due to the use of patented Nanophosphate™ technology. 7.50 TARGET WELD AREA Nominal capacity and voltage Recommended standard charge method Recommended fast charge current Maximum continuous discharge Cycle life at 5C discharge, 100% DOD Recommended charge and cut-off V at 25°C Operating temperature range Storage temperature range Core cell weight 1.1Ah, 3.3 V 1.5A to 3.6V CCCV, 45 min 4A to 3.6V CCCV, 15 min 30A Over 1,000 cycles 3.6V to 2V -30°C to +60°C -50°C to +60°C 39 grams 10.00 64.95 ± 0.20 18.20 ± 0.20 Discharge Characteristics, Room Temperature 3.6 3.4 5A 10A 20A 3.2 Voltage (V) [ ... ]

APR18650M1A PDF Datasheet Download