My 2009 Jeep Liberty constantly has a dead battery every morning. The battery stays charged throughout the day but drains at night. What is the problem?

Is the alternator charging , with engine running connect a volt meter to battery should show around 14.2 volts , is there a short , remove leads from battery over night , if it starts in the morning there is a short circuit, if the battery is nun down it's faulty even though it's new .

put kill where? at battery post, and is just a switch,
not those dynamic battery drop relays?
if the battery goes dead with the neg. lug pulled the battery is bad.
end of life , battery.
the lug pull never lies.... ever.
if stays ok now this is called battery phantom drain.
(or aka. dark currents)

finding cause takes an ammeter. any,
here is all ways to find a drain.

http://www.fixkick.com/drain/drain.html

Hello Jr, The fact that the battery goes dead even with a kill switch would lead me to think the new battery is defective.

Your tailgate switch is bad or not adjusted properly.

Your alternator is bad that recharge the battery as you drive

Has a parasitic draw (drain) on the electrical circuit ! Watch this video !
Improved Methods to Find Parasitic Draw Battery Drains Overnight


The BEST Way TO Perform Parasitic Draw Test

Something is staying on or a control module isn't powering down .

Hi suggest check this procedure about How to Do a Battery Parasitic Drain Test.

Check and verify that your alternator is charging properly, if you hook a multimeter up to your battery you should see a voltage between 13-14 volts on the charging side, if this is the case your alternator is good, next i would check the resting voltage of your battery that should be tested with the car off and it should be between 12-12.5 volts, if all of this checks out i would start looking into the parasitic draw on your battery while your vehical sits overnight, make sure all your courtesy lights are going off, your glove compartment light any under hood lights things like that if any lights like this are remaining on you will have a dead battery day after day because the light or draw on the battery keeps draining it of its charge....

I would charge battery fully and disconnect it and let it set over night........I have gotten faulty ones and checked it like this the next morning and found it dead.If it still stays fully charged u may have a faulty ground somewere. Hope this helps.

The car has a short somewhere. My guess is a ground fault where by power is being consumed in the cabin. Annoying tho this is i would leave the fuse out and if the car runs ok leave well alone. In England JEEP has a real bad track record for electrical faults. If it ain't broke Don't fix it. Steve in UK