This could be your alternator. No one can have this much bad luck. Did you have the batteries tested before you changed them?? Sometimes they are not always the problem. Go to a local mechanic and ask them to do a BATTERY AND ALTERNATOR TEST ON YOUR VEHICLE. This will cost max $20 and takes them about 40 secs to do it. Let me knwo what you find out.
**Working PART-TIME for Carjunky for a while, Please bare with me =)**