First, it started to stall and the lights to my radio and AC all started going out (as if battery draining). I park, and when I went to turn it on again, it wouldn't turn on (as if battery fully dead). I tried again a couple days later, and same: nothing. I bought a battery charger, charged it (it showed that it was empty) and then re-installed in the car. It turned on right away. Turned it off, started it again, and turned on right away. But now it's been over a week and I went to turn it on (I have not driven it since I installed the fully charged battery) and it's back to not turning on. At first I thought it was the battery charging system, but if it was so, then why is it not turning on despite me not having driven it since the battery was charged? Should I check if the battery is dead again and let you know? Would that help?