So I go to start my '05 w/ 20K after sitting for 1 day and nothing... Red light for the security system is flashing, sounds like some kind of servo moving in the dash, sounds of the fuel pump, throttle body clicking and noises coming from the passenger side kick panel. Other than that no radio (non shaker), no horn, etc....

I read threads about the battery issues so I went to check the electrolyte (assumed it was maintenance free) and it's dry. I refilled the battery and have it hooked up to a tender and waiting to see if it will start.

The noises had me worried about the water leak issue, but it's dry on the passenger side. So I assume the battery is probably toast...?? If so, pretty disappointed in the battery because I have a factory motorcraft in my 99 mazda pickup that is stock and still going strong as ever.

 

If it's the OE battery from '05, you're probably right - it's toast. I replaced the one in my '06 with 50K miles this year, got a MegaTron 40R.

 

Correct.
Battery Toast.
The S197 stang has 1.25 amps of draw just sitting parked
no accessories on. It takes it toll moreso than vehicles of
yesteryear that had ZERO amp draw while sitting parked.

 

Replaced mine a few monthes ago after I was getting long, hard starts and no dash lights.

Fires up like a champ now.

 

Wow, 1.25 amps/hr?! No wonder it drains the battery.

I have found that unless the battery is a sealed gel type, it's not maintenance free. I seem to have to add water to the electrolyte every few years. I assume that it is evaporating through the caps (vents).

BTW, you should never allow the electrolyte level to get below the plates.

 

I had to replace my OEM battery when the car was only 2 1/2 years old