The replacement is very easy, the hard part is getting the battery replacement. I couldn't find any source of it outside becker, the depth of the battery is critical and I couldn't find it anywhere. Finally I got it from Becker but only after a couple of months of back and forth. Others have drilled a whole through the case and mounted a larger battery on the outside. I will probably do that when this battery dies in a few years. Much easier and easily replaceable. Good luck.