dead battery !?

[gAZ]

Erm.. just took my car to work this morning , everything was fine.
Parked up as usual, just came lunch time and i went to the car to get some food and the fob wasn't opening the door? (Or so i thought)


So I opened manually with the key, put key in ignition and...... Nothing!

No electrical power on the car at all.

Might be a dead battery I guess, but it's been fine up till now and find on way to work, but now nothings working just 4 hours since parking it up.

And as far as i know I've not left any lights on or anything.