2000 VX V6 alarm sounding wont jump start

[lifeofcrimeguy]

Hey all, this afternoon my alarm started sounding for no apparent reason. Looked out the window and actually figured it was not my car for a couple of hours, because the lights weren't flashing. Eventually go for a wonder because the alarm has been sounding non-stop for 2 hours, and it is my car. No power to doors or boot, etc. Attempt to jumpt start and nothing happens except inside, all of the dash lights start going crazy. And the alarm gets a little louder. Now the car doesn't get much use, so I'm pretty used to dead batteries 2-3 times year (260 000 on the clock). I've bought a solar trickle charger from supercheap and recently had my crank angle sensor replaced (holden serviced just a few months ago). So I was hoping that all my gremlins were taken care of. Tell me this is something simple like a replacement battery or something (which is < 12 months old btw), and not something more costly. Can't even lock the damn thing when hooked up to the other car via jumper leads.

[VX Exec]

Correct me if im wrong but i think i've heard that the alarm sounds when your battery goes flat. Although that being said, if you turn it to ON and have reds on the dash, you should be able to jump it... If not it should just be a new battery.