This car's battery voltage will drop below the voltage that will start the car if the car is parked for more than overnight and the memory fuse is not pulled up.
I bought this used car in December 2009 and neither the salesman nor the sales manager mentioned this fact to me at the time of sale.
Shortly after I purchased the car it was parked for three days. When I went to start it the battery didn't have enough voltage to turn over the starter. A 10 amp battery charger got it going so no real problem but got me worried that may be the battery would fail while I was in town. But it didn't. If the car is only parked overnight, there is no problem starting it the next morning. But let it stand for two nights and the car won't start on the third day.
That's when I went looking through the manual that I had to ask for because it wasn't in the glove compartment at the time of sale.
Buried in the Kia manual there is a procedure to go through when parking the car for a "prolonged period"--the fact that this "prolonged period" is only two days was not revealed to me at the time of sale. Yes, that's right. The battery will not start the car on the third day if it has been sitting parked for two days. Overnight parking is no problem but leave it parked for another day and the battery will not start the car.
What is the procedure described in the Kia manual, you ask? "Turn off the headlights and tail lights and pull up the MEMORY FUSE in the fuse box that sits in front of the driver's left knee"--this procedure disconnects the clock, the audio (radio), the door chimes, and the interior lights. But the rest of the electrical components in the car work (ignition, headlights, tail lights, etc.). But if you drive the car with the memory fuse pulled up then the Tire Pressure Monitor check light comes on.
Following this procedure, I was able to leave the car parked for four days without having the battery go dead.
Does following this procedure mean that when one is ready to drive off in the car, the clock needs resetting as does the radio? Yes they do!
This is a real pain in the you know what. I feel the salesman and everybody else involved in selling me this car were deceptive by not telling me about this 2007 Kia spectra quirk.