I’ve used this Instructable a few times to revive temperamental remote control buttons, and it is a very satisfying and easy job. Getting the plastic case apart is usually the most difficult part and just takes a bit of patience.

I fixed our DVD player remote yesterday and was surprised to see the original batteries from 2006 were still installed. They feel very light (7 grams less than a Duracell), and look like cheapies, but must be the best batteries ever made.