On Mon, 25 Nov 2013 20:16:21 -0700, Tony Hwang wrote:

You should. That Omron relay contats can be open or closed.
Is it NO or NC relay? Is the coil good? Have you metered them out?
What is the findings? Did you looked up the specs. of that very common
relay?

Now that the alarm system is (almost) fixed, I can spend the effort
to look more closely at this D135A battery protection circuit.
resource.boschsecurity.com/documents/Data_sheet_enUS_2548187915.pdf
resource.boschsecurity.com/documents/Installation_Guide_enUS_2548185099.pdf

Even though nobody will tell you a price, I found this Bosch price list
on the web:
http://www.industry.usa.siemens.com/...st-3-1-13.xlsx

The D135A retails for $22.56 according to that spreadsheet.