Why are power tool batteries a bundle of multiple cylindrical cells rather than a brick like phone or laptop batteries? Are there advantages other than cost?
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Convenience. A phone needs a special flat battery to fit in its confined body. Whereas, with a laptop or power tool, bulk is not as much of an issue.
A lot of power tools *and laptops* use cylindrical cells like the 18650 in their battery packs, just arranged in different ways: In power tools, it’s most convenient to stack them in a box that snaps into the tool handle, whereas in laptops they’re best lined up end-to-end along the back of the laptop where they won’t get in the way of the laptop’s other components or in the way of the user’s typing.
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