How do I get the apple wireless mouse open to replace the battery?

Turn it over and with the green light at the top and the black rectangle at the bottom, flick the black rectangle towards you with your finger nail. The battery plate will loosen or come off, and should automatically switch off the mouse at the same time. Obviously, if the battery is suspect you will have no green light any way.

Exchange, recharge the batteries, replace them and then align the plate and gently press it back into place . It should click as it is seated. Switch on the mouse, click twice and away you go.

I see the hosts have beaten me to it, but I was about to ask for your address to be removed. It's not safe to publish on a public forum unless you want to be inundated with spam (or even worse).

I can't tell what machine you have but providing the mouse works I'm not sure it matters that much if it is not discovered. My wireless mouse has never been discoverable since day one and after an initial bout of concern I simply ignored it. Otherwise, I'm glad to see it worked out. Thank you for the star.

Incidentally, I chose my name, 71, some seven years ago but I can't update it without losing my recognition factor, here. You just don't think about these things when you are new to computers and are suddenly asked to create a user name.

Still doesn't open, just broke my fingernail trying to do it.