So, why is anybody arguing it is not just about lock in, when their specs are similar enough that they are interchangeable - more a rarity than the norm in the realm of electronics? It is a pertinent thing to point out, since if the tools work just fine using each other's batteries, any other answer rings hollow in light of it.
So, please don't TFA me, it is unsavory and adds absolutely nothing to the conversation.
The Torque Test Channel has done several tests with a single tool using different batteries, comparing (usually) the torque the tool can produce with each. E.g. this[1] with a DeWalt impact driver.
Well I spent too much time on that channel! For that specific test, he is testing no-name batteries against name brand. But there are adapters like [1] that allow you to use another name brand battery in your tool. That test would be the one that matters. Also, if all tools used a standard battery format, there would be much, much higher quality off brand batteries just because aftermarket products for improving performance would make more sense (along with the sloppy cheap stuff, of course).
Well that lets people have the best of both worlds. Few serious tradesmen who use a tool all day are going to use a battery with an adapter. Ergonomy is a big factor, tools get updated regularly anyway, and it's not a big deal to buy into one or more systems. But if someone for whatever reason has a hodge-podge of tools, they can get an adapter.
> As many readers might be aware, you can find 3rd party battery adapters on Amazon, eBay, and other such marketplaces.