[MatthewPhillips]

So then only do it when on wifi and connected to a power source? I don't know, make a sane design decision but don't force your users to babysit stuff that doesn't matter to them.

This is not something users should have to think about, at all. "Update" shouldn't be in the user's vocabulary. Sure, some people are interested in that level of control, and for them there should be options to configure it.