Just bought one of those from Performance Batteries myself. Seems like good stuff.
One minor problem - I was going to mark the installation date on the label but the years only go up to 09. About time they bought some new labels!!
Have you had the steering wheel off for any reason? Faults with the contact ring behind the wheel can cause the SRS light to come on (Don't ask how I know!)
Have you checked the fuses in the engine compartment?
Checked the earths?
Can you flash your high beam when lights are off? If so try replacing the light switch with a known good one.
If you are after a replacement fob make sure you get the right one - 418mhz or 433mhz.
It is most likely to be 433 which are difficult to find. Look at Remote Key