This car has had 2 new batteries and after sitting over night then getting in to the car the battery is dead. I put the battery on the charger and I then charge it full. Put it back in the car and the car will start. What is causing the battery to go dead over night. I know it is not the battery because at first we thought we had gotten a bad battery and then got another and it did the same thing. So I am thinking something elctrical is draining it overnight.

has your car got a aftermarket security system ? sounds like the ignition and/or the fuel pump is being isolated by a security system fault

It is best to "trickle charge" a low/dead car battery using the lowest setting. The "jump start" function will probably not have enough juice to start your car by itself. Refer to the manual of your charger for safety precautions.

Its possible the charger is telling you the battery is too dead for the charger to work. A safety feature to keep from burning up the charger.
I'm not aware of any fuses between the jumping post and the battery. You may have a short in the car that is draining power.

Someone will need to pull the fuses and disconnect the major electrical components until you find the power drain. You use a meter or test light to watch the battery voltage. It could be anything from a stuck relay, to a short in the wiring.

Does the alternator light come on before you start the vehicle..
If not the alternater is incorrectly connected or the globe is blown . It will not charge if the globe is faulty.

just put a battery charger on it ,you do not have to remove the battery to charge it ,the positive terminal is the larger of the two battery terminals

That is not necessarily correct-if the car sits all the time, parasitic drain on the battery will eventually kill even a new battery. Telling someone that a car has to be driven 1000 miles a month to maintain the battery is not a solution-if you don't drive alot, get a trickle charger ($good one is $30, one that works can be found for $10) that you can plug in and keep hooked up to the battery to keep it fresh. Another way is to get a solar panel charger (1 1/2 watt, about $20 at Harbor Freight) and put the panel on the dashboard, and the other end into the cigarette lighter socket in the dashboard. A third solution is to buy a deep cycle battery (Optima) that can be fully drained hundreds of times yet will recover and work properly-these are expensive ($175), but out perform conventional batteries that die if fully discharged a few times. You could also install a remote starter and periodically start the car, letting it run for 15 minutes-about $200

replace your battery, a battery discharges every day you dont run the alt. to charge it up... after a week or 2 weeks the battery would be dead, just from a car sitting not being started... if you are not using the vehicle, it is a good thing to replace the battery, and every couple days just start the car up and let it run a while to charge the battery.... if you are going to have to leave the car for a while without starting it, then disconnect the battery, and remove it from the vehicle... you can buy a cheap trickel charger for the battery when it is out that will keep it charged till you decide to put it back in.... hope this helps you...

I would start with putting a battery charger on the battery over night. If the battery takes a charge, then you may have ruined the voltage regulator in your alternator and the alternator is not charging the battery.

Does it have a distributor??? If it does,take it off and spary the inside of the cap with WD-40. It sounds like you have moisture built up in the cap from just sitting there. You might also need to put a battry charger on the battery to bring it back up to fully charged. Cold weather sometimes play a tole on cars sitting around, especially Batterys.