@Skellington DeWalt does not change the battery configuration for the same voltage. IIRC some tools can use multiple voltage battery packs. If you have 20v DeWalt tools then all 20v batteries fit, I have a 20v drill from years ago when they first came out and my latest is the circular saw I got a few months ago and it's the same 20v battery. I don't know about other brands...
JT
JT