Automatic power plan change?

Is there a way to get Vista to automatically change power setting plans depending whether a laptop is on mains or battery?

I want to run mine on high performance when plugged in but on balanced when using the battery. I know I can manually change which plan to use, but surely there must be a way to get Vista to recognise which power supply it is using and change settings accordingly.

Normally, it is done automatically!

Thanks for the reply.

Not on mine it's not

Let me clarify that last post of mine. Vista recognises automatically when it goes onto battery but, certainly on mine, won't change power settings.

If you check the power plan *options* you'll see that each power plan comes with set options on how to run based upon whether you are on AC or on battery.

The power plan *itself* does not change, necessarily, but the way the plan is implemented does.

Thanks johngalt, you've cracked it

I've now changed several settings in "Options" which I hadn't realised affected the implementation of the various plans.

Once again, many thanks.