Trying to use external monitor on MBP

Hi,
I've hooked my Macbook Pro 15" to an external Dell monitor, keyboard and mouse and everything seems to be working fine - I can put the laptop to 'sleep', then wake it up via the external keyboard and then use the external monitor as the main monitor with the laptop screen 'asleep'.
All working fine, but only when I'm using the power adapter. If I try and run from just the battery the laptop keeps going back to sleep. It 'wakes', but after a couple of seconds goes back to sleep.
Anyone have any idea how I can stop this happening?
Thanks.

Apple requires the AC adapter to be connected when running in clamshell mode, see http://support.apple.com/kb/HT1308?viewlocale=en_US
You can use insomniaX to prevent sleep when running on batteries, see http://www.macupdate.com/info.php/id/22211/insomniax

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