The thing about their system is the whole only works so long as they keep you locked in. Once you make a choice you are locked into that choice and won't be looking at alternatives - but if they change batteries you suddenly are faced with the loss of your entire investment and so you are likely to look at the competition and might buy something else. That makes changing battery formats less attractive to the big brands trying to get people who buy a lot of tools.

The store brands have a different motivation: they know you won't be buying them again anyway, so they don't care. Changing formats means they can come up with some tiny reason the new one is better and try to sell the next customer on how their new battery is better.

If you are not a buying a lot of tools your plan isn't bad, just throw away the tools when the batteries die in 10 years. The tiny reasons some battery is better - over 10 years might add up to something slightly better than before anyway.

After the first ones broke we asked around and received only three recommended brands. DeWalt, Makita or the Blue Bosch line (in Germany). We went for DeWalt and never looked back. The power cells haven't changed in form or fitting in the years since and we could not be happier with performance and durability.

It is like deciding on a DSLR system. Once you are invested into Canon, Nikon, Sony or the likes with lenses and accessories you are locked in but also you learn to really know your tools and imho receive a productivity boost.

For example - whenever I am with other people and need to use their tools, I have to look at them and see how they work, what buttons/knobs are where and so on. With my DeWalt tools this is already muscle memory and the work as an extension of my arm - my brain uses them as if they were a part of me. This let's me focus more on the task I want to perform, not on the tool.

The smaller brands like Craftsman and "store brands" seem to change relatively randomly.