Flat battery and alarm

[AlanPL]

Hi - I am a newcomer to this forum, hope someone can give me some advice, please.

Could not open the door with the remote fob to disarm the alarm, put the key in drivers door,when opened, alarm went off, unable to stop it until used the remote key pressed up against the front passenger door, alarm stopped.

I am now concerned about opening the door, If the alarm is activated, will it stop if the battery is disconnected or is there a backup supply to the alarm? 

 

Regards - Alan