Over the years I've had battery compartment corrosion occur in the remotes for a variety of different devices: stereo receivers, satellite and cable boxes, televisions, as well as in battery powered flashlights, radios, cassette and mp3 players, and other devices themselves. This is not a phenomenon restricted to Roku remotes. As it turns out I've not had this occur in any of my Roku remotes over roughly 8 Rokus in the last 10 years or so, but they should be as susceptible to it as any other battery powered devices.
It's a fact of modern life. Replaceable batteries can leak, and when they do they deposit white powdery stuff. I've had to resurrect many a device by scratching through these deposits with a file, knife, or screw driver in order to re-establish electrical connection to the (new) batteries.
I suspect some battery brands, especially some generics, may be more prone to leak than others.
I have only ever experienced this happening over the years in electronics that had been sitting idle for months/years at a time. Just odd that each Roku I have purchased in the last couple of years all end up having corrosion so quickly. It happened with the batteries included, I haven’t had to replace any of the batteries yet because none of them have died on me yet.
