Electrical Issues...

[Shrek_H2]

sounds more like the alternator gone bad and not charging....

Did you add any aftermarket products?

[HUMTECH]

sounds like the ignition switch is not adjusted properly and is staying in the accessory position with new key off. try turning the key to off and really turn it hard. if the lights go out the ign switch is misadjusted. Also try turning the key slowly to the start position, if the engine cranks just as you past the on position is another indication adjustment is out.

[Metallic Red]

Diddo I had the same thing happen. The dealer replaced Ign switch, and because they did not install it right, it happened again!
They came to the house and fixed it and replaced the battery they killed!
It was under warranty or I would have done it myself.