How can i fix my scantronic 9448 home alarm system?

The electrics tripped out in my house and the alarm system went beserk - firstly the internal alarm noise, then the external alarm noise, eventually i managed to stop it by entering my user code - but it took loads of attempts. Now the Zone lights are permanently on except 1 of them. The mains power light is on. The entry/exit zone light is flashing. The tamper loop light is flashing. My neighbour said I might need a new battery? If so where do I get one? Many thanks to anyone who can help.