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Understanding the Truth About Button Top and Protected Button Top Batteries Important! Panasonic, Sanyo, Sony, and Samsung DO NOT manufacture Button Top or Protected Button Top batteries. These reputable brands manufacture only Flat Top Unprotected bare cells. However, some auction sites and wholesalers are misleadingly advertising the following batteries: Panasonic 18650 Button Top Battery Panasonic 18650 Protected Button Top Battery Sanyo 18650 Button Top Battery Sanyo 18650 Protected Button …