Brisbane

That's fair. It would be nice to have what ever battery, and be able to plug into which ever tool (might be a market for after market battery adaptors). I feel like the brand name of the tool is some kind of indicator of the quality of the accompanying battery as well.

Modular power supplies have a similar problem in the PC building world. The cables are not interchangeable between brands due to different pin-outs (5V, 12V, etc), and sometimes not even interchangeable between the same brand with different models of power supplies.