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Did you check to see it needs an air gap? check with AutoZone, O Riellys or Pep boys. By the way did you know that AutoZone has a repair section on their website?
Does the car crank slowly, or the starter clicks when you attempt to start it? If the alternator or voltage regulator is bad, the battery would continue to lose energy and appear to be bad. Alternators need to be fed voltage since they don't have magnets to excite the windings. On my Volvo, sometimes the indicator lights don't come on when I turn the ignition on, before actually cranking the engine. When this happens, I know from experience that the battery won't charge. Do you get any dash lights showing a problem?
You can check the voltage at the battery when the engine is running; it should be well over 12 volts if charging.
If a trunk, glove compartment or interior light is on, that can run the battery down too.
It takes a lot of time to charge a really dead battery. When you try and start the car with a dead battery installed there is a large voltage drop across your jumper cables so you must achieve a reasonable amount of charge on the battery before you can turn over the engine even with the jumper helping. If you are losing charge on your battery in a short period of time you may have a failed voltage regulator, a bad battery, a bad alternator (should be putting out 14 volts DC or so) or bad connections. You could replace the battery (with a charged one) as a test to determine that the car will start. If it starts OK than read the voltage on the battery terminals while the car is running to check the alternator and regulator.
this sounds like a bad alternator/voltage regulator problem. not sure if Hyundai uses a computer control regulator so you might be looking at a computer replacement. have it check out at a shop so your not throwing parts at it that are not needed.
The max charge voltage is usually around 14.5 volts, so 14.4 is not high. Its possible the battery has a dead cell and that is causing the acid problem. You might want to check with the dealer on what the max voltage is for your car.
I have the same problem. Usually I notice that somehow my trunk is open. Even if it is slightly open the light in there is on and the battery drains. I have also had it happen when there hasn't been anything on or open. I have to take it to the dealer at some point but for now I am replacing the battery because it is competely drained and I can't even get a jump to charge it. :(
crank sensor will cause similar stalling issues. You may have got a bad alternator, if the battery light is on after you jump it, probably needs a new, new alternator. make sure all your connections are tight and plugged in, both on battery and alternator.
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