Why are small batteries (like AA & AAA) standardized but not bigger batteries (like power tools or E Bikes)?
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Small batteries have been around for a long long time, and standardization made sense because your batteries were expected to be able to pop into any of a hundred or so devices. With most larger batteries, there is standardization as well, like car batteries (their sizes usually start with the word “group” followed by a number). Even power tools and e-bikes usually have standardized battery types and sizes inside the battery pack.
That’s the confusing bit. My DeWalt drills use different battery packs from my Hilti or Milwaukee tools, but if I were to crack the casing on those packs, the individual batteries would be very similar to each other. It just makes more sense to the manufacturers to put those cells into a proprietary pack so they can sell more battery packs down the road.
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