Phoenixblazes
Super Freak
They do leak, they damaged a remote for my thermo-central unit, and the Duracell should have lasted 2 more years.
Use Eneloops instead.
It's not just length of time. I've found that on devices used continuously like for led lights (not just remotes etc which are used sparingly), that once they start to go flat, say over weeks, they will eventually leak during that time.