Having both 5000 and 2500 each with its own genuine slim battery, 9862 and 9013. The 5000 is my "home" radio and the 2500 is the "travel" radio. I like the build of the 5000 but with both slim batteries being almost same thickness, the height is a inch or so difference I know the 5000 is built better and it just feels better. Although the slim batteries transformed the feel of them both. Real world, I've used my 5000 in the past 2 weeks and haven't turned on the 2500, its more a backup if I'm in between charged batteries.