How about hooking up a trickle charger to the battery when not in use, buy a cheap 1 Amp charger.
Also the battery is not a maintenance free battery so you have to check to make sure that there is electrolyte in the cells, top off with de-ionized water.

Any idea what a secondary intake malfunction is? I wonder if that relates to the dual stage intake plenum. could be you have a dead plenum valve actuator? Does the car stumble during acceleration.

Correction, it's not an intake malfunction it is, P0410 Secondary Air Injection System Malfunction.

If you haven't downloaded the free PDF repair manual I suggest you do it. On page 3,257 it will tell you where to begin. go to section 9-362 for diagnosis and repairing the problem. on page 1,927 give the details on code P0410.
sounds like you might have a bad relay, good luck!