I think it has had it.. but yeah, if anyone thinks diffrent, please do tell me

So okay, appart from getting cake and chocolate stuck in my fan holes, and a USB port, (I think) the battery pack has finialy gave in.

Before I used to get 3.5 hours out from it, now I only get around 1h 15 mins from it. - Well, I did untill this morning.

Now when ever I plug the laptop in to charge up, The red p[ower light flickers on and of every second or so... and the laptop constantly tries to start up?

Anyone have any ideas how to fix this.. or has it just had it now?
Thanks,