Mazda 3 '06, doesn't turn on
I parked the car in the parking lot of our apt around March. Since then I
regularly turned it on (even though not so often). Today though, while I tried
to turn it on again, when I turned the keys, the car didn't show the usual
checklights on the dashboard. The dashboard's indicators were going end of
scale and back. No effort to start the engine showed. The only light on was
the oil light. When I pressed on the break, the backlight on the dashboard
turned off. Could it be the battery?