Bad batteries or current draw?

[samer0214]

About 2 months ago, I replaced the battery that came in my 2005 4.8L with an Exide battery, because the old one tested with a bad cell.

Less than a month later I had to exchange the Exide for another one because that one failed with a bad cell! A few days ago the truck wouldn't start after having sat undriven for a little more than 24 hours. I had to jump start it and it's been starting fine since.

Both the battery and alternator tested good at my mechanic's shop, but he told me that he has not had very good luck with Exide batteries over the years, and when I asked him about checking for current draw/leak, he said it's hard to test for those because of the various modules on the car that are constantly drawing power.

So which is it: Bad luck with batteries? Problem with Exides overall? Current draw?

Is it in fact hard to check for current draw on our trucks, or is there a procedure for checking?