Toyota Auris alarm

Sure it's your alarm that is the fault ? Have you had your car battery LOAD tested as a low battery and dropping further overnight can trigger alarm ( if that's what is happening ) also check bonnet alarm switch is o.k and possible water ingress

Hello.its a brand new battery and the one before was as well but it was a lion battery " so bought the best I could get and still flat after 4 days " had it in an auto electric shop twice and they couldn't find a problem.iv disconnected the alarm switch under the bonnet .iv disconnected the radio .its still going flat after 4 days ' toyota said its probably the alarm but wouldn't tell me how to disarm it .but would book the car in for the day " don't want to be paying out again if its an easy fix ? What iv done is added a cut off switch to the battery so it doesn't go flat "which it doesn't " but its a pain to reset the clocks and radio (now connected again ) every time i get into the car .its the only fault on a otherwise perfect lovely car " thanks for your reply

Take it they checked for a parasitic drain ?

Yes over two days ? Said there was a drop but couldn't find it "wanted the car for another five days but I said no thanks " im going to start by taking the alarm off then a new alternator and starter because there getting on a bit ' I thought a good auto electric shop should of been able to find it after two days ? As its already staring to drop " if it was a 60ts 70ts car I could of sorted it 'not that this ever happened to me even into the 80ts " cant leave my car at airports or leave the car because it will just die " thanks again

You should see any parasitic drain immediately when testing and not need days to find
".Start by connecting a digital multimeter to the negative battery terminal of your vehicle. Then, remove the fuses one at a time while watching for changes in the multimeter's reading. Once the reading drops, you've found the culprit and can take steps to repair it. "
On an American forum I'm on we have had some newer problematic vehicles where it was found the key fob in the house was still in distance and transmitting to car , not allowing some systems to shut down and draining battery over a few days . Solved by moving key or fitting in a faraday pouch .But doubtful if it would apply to your car / tear but worth a try

Great thanks thats an easy thing to do will try as soon as i can "yes my car is 2005 so it might not be the fob but worth a try '