My xr2i won't start, was ok yesterday but got in this morning and the ignition lights and stuff come on when one turn but next turn to start the engine everything dies, i put my booster back on the battery and it starts but then when i try without it just dies again

Edit: oh and i have a aftermarket immobiliser

 

Battery goosed/flat

 

I checked connections and just had th car running for 10mins tomake sure it was charged but still dies after engine is off the tuied on again

 

Sounds as if the battery is completely Wanked, and is not taking any charge. Get it Running, put a voltmeter across the battery terminals and check the voltage is at 13.5 to 14 volts, if it is the alternator is charging, which is good. So it is possible the battery is Fubared.
Also when trying to start is it turning over very slowly or just clicking?

 

Battery mate....

 

fucked battery, there may be a short circuit somewhere.