One caveat though: do your best to ensure that your source sells genuine cells and not knock-offs. I prefer the second option, as you’ll usually get a much better price going straight to the source, even when paying for international shipping. When it comes to buying your cells, you might be able to find a local source, or you can order them straight from Asia. Samsung ICR18650-26F cells straight from the factory I get my Samsung 26F cells from Aliexpress, usually from this seller but sometimes I’ve seen a better price here. These 2,600 mAh cells should cost somewhere around $3-$4 in any decent quantity and can handle up to 2C continuous discharge (5.2 A continuous per cell). A great entry-level cell is the Samsung ICR18650-26F cell. Name brand 18650’s cost a bit more, but trust me, they are worth it. These cells have well documented performance characteristics and come from reputable factories with excellent quality control standards. I prefer to use name brand cells from companies like Panasonic, Samsung, Sony and LG. There are many different types of 18650 cells out there to choose from. Depending on the size of the battery you plan to build, you’ll need anywhere from a few dozen to a few hundred of them. These cells are distinctive due to their cylindrical shape and are about the size of a finger. For many years there were only mediocre 18650 cells available, but the demand by power tool makers and even some electric vehicle manufacturers for strong, high quality cells has led to the development of a number of great 18650 options in the last few years.
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