dead battery blues?

["fluxmcfly" <bfreyguy@xxxx>]

Well, just the other day I planned to take the D for a spin around 
the block, because it has been sitting for a few weeks. when I tried 
to start it the battery was dead. So I charged the battery for a few 
hours and it fired right up. The folowing day I went to drive it 
again and the battery was dead and it is a new battery What could 
this be? I have never had this problem before. Any ideas would be 
very helpfull
thank you

brian