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?

Question

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?

In: 26

Answer 1

Those square batteries aren’t allowed to have vents and are less durable and more prone to swelling or exploding than the cylindrical ones. The high power ones for drones and the like are usually charged in a fireproof bag with a bucket of sand nearby.
Also multiple batteries in series gives you higher voltage, which allows for more power, which is more important than battery capacity on a lot of power tools.