No, these aren’t some sort of weird, blue AA battery, this is actually a 18650 Lithium Ion Cell. These round high capacity cells have been mainly used in flashlight type applications but with its capability to be used as a drop-in rechargable cell at 3.7V with a capacity of 2600mAh. This is a great battery option for those of you who need a simple to install and replace cell with a lot of juice.
The datasheet says that the cell was manufactured by General Electronics Technology Co., Ltd, which is a Chinese company specializing in the research, development, manufacturing, and sales of polymer lithium-ion batteries and related products. GET is a legitimate manufacturer, so their unbranded batteries are likely just as good as some branded options, like Samsung or Sony cells. Hope this helps.
