jeep_daddy wrote:
Now I have DeWalt 18 volt stuff and they've been replaced by the 20v tools. I was able to buy a couple of 18v batteries recently, but I just found out they make an adapter for the 20v batteries to fit into the 18v tools. I like the 20v tools because they are smaller, lighter, and more powerful, but they are also expensive so I'll keep using my 18v tools and when I need a new battery I'll get the adapter.
Same battery but one is calculated at the nominal voltage and the other is calculated at the fully charged voltage. Same number of cells. They did this so the average home punter thinks he is getting a better deal with a higher voltage. And they usually added a bit of plastic so they wouldn't be interchangeable and coincided it with releasing the brushless tools. So you have an "excuse" to "upgrade".