Battery keeps going flat!

[S3THUNDER]

Hi all, My battery is dead after one week in the garage. It's the second week in a row this has happened,which worries me ,as the battery is only just over one year old. Even the alarm wasn't flashing. The only thing I have changed lately is the stereo,which has a removable front panel. I will remove it,but I can't see if it's switched off,how it could drain it. I will also switch the alarm off. Any ideas what can kill a battery so quickly?

[S3THUNDER]

Thanks.Some great ideas. I will check to see if the battery is duff first. I'm sure I didn't leave the interior light on?

[S3THUNDER]

Good thinking. I forgot about the warranty.

[S3THUNDER]

Thanks again. I've been on holiday,so the petrol gauge is still on the to do list. I think it's the sender that's knackered ,which I hope to replace soon. The list of jobs never ends.