What would cause my 04 envoy battery to drain in just a few hours new battery

SOURCE: my battery keeps getting drained

have the the battery checked to see if its good. Could be just a bad battery.. Also have the alternator checked.

SOURCE: 2005 Chevy Envoy won't start

If you couldn't jump it not getting fuel,could be clogged fuel filter,fuel pump relay, fuel pump.

SOURCE: 1998 Avalon XLS battery drain

Does The car shut off mid drive? Could be a Wiring harness problem,
I think it's you're alternator though, That would be a good reason you're battery is dieing,

How do you get the car started again?

SOURCE: My battery in my 2002 gmc envoy dies over night

Check and make sure nothing is staying on ie. lights. Check the cells on your battery to make sure they are good. It is possible the battery isn't holding a charge.

SOURCE: 2001 Mercury villager battery drains after 2 days. New battery, alternator and starter. Something is causing a constant drain any one know if this is common?

Not common to your car in particular, but common.
Unhook your battery each night to keep from draining the battery whilst you search out the problem.
Put a test meter between the battery and the cable you took off to see how much of a short there is.
Some things that I have found were:
1) Some new replacement radios will drain a battery because they are on all the time, like most television sets today.
2) I have a car, (and have had a few more) that the glove box , (being plastic) was warped, and the glove box light stayed on all the time. I had to remove the bulb.
3) An alarm system, and some are factory built in, can drain a battery.
4) A trunk light, an under-the-hood light, or something else can do this.
Be blessed.