Sounds like a dead battery to me too.
Check the voltage - before and during cranking. Should be 12.7 before and around 11 during cranking.
EDIT: Sorry - I re-read your post and noticed you did that - I'd still check it again though. I've had similar issues in the past where the starter relay was bad, and was creating resistance and dropping voltage to the starter. Jumping the relay or applying power directly to the starter pinpointed the problem. Also check all of the battery connections, cables, and grounds.
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