Replacement only takes about an hour. The hardest part was finding batteries with the tabs already on them because I didn’t want to have to get a tab welding tool as I already have way too much crap. I did the batteries in mine about 3 years ago and they still work great. Unfortunately the source i got them from doesn’t sell them anymore.

I’ve eaten it from my mighty and it wasn’t too bad. About a teaspoon of it works as a good starting point.