This part is a kind of semiconductor called ICR18650-26H.

Function of this product has Lithium-ion Rechargeable Cell.

Manufacturers : Samsung

Image and pinout :

Some of the text within the PDF file :

-SAMSUNG SDI Confidential Proprietary – Spec. No. ICR18650-26H Version No. 1.0 SPECIFICATION OF PRODUCT for Lithium-ion Rechargeable Cell Model : ICR18650-26H December, 2011 Samsung SDI Co.,Ltd. Energy Business Division 0 -SAMSUNG SDI Confidential Proprietary – Spec. No. ICR18650-26H Version No. 1.0 Date (YY.MM.DD) 11.12.02 Rev. No Ver. 1.0 Initial History of Revisions Description Approved by Quality(CS) Development Simon Shin Wanmook Lim Proposed by Hyorim Bak 1 -SAMSUNG SDI Confidential Proprietary – Spec. No. ICR18650-26H Version No. 1.0 1. Scope This product specification has been prepared to specify the rechargeable lithium-ion cell ('cell') to be supplied to the customer by Samsung SDI Co., Ltd. 2. Description and Model 2.1 Description Cell (lithium-ion [ ... ]

ICR18650-26H PDF Datasheet Download