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From what I see once you get beyond single cell Lithium batteries such as the CR123A and 18650, they are all either custom flat pack batteries such as used in virtually all current thin tablets, phones and ebook readers or custom packs for portable computers made up of multiple 18650 or 26650 cells. Based on offerings on ebay, Amazon and other web sites there are virtually hundreds to thousands of these battery sizes as virtually every new model tablet or phone has it's own unique battery.
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