If you leave a car sitting around for a long period of time i would recomend running a trickle charger on it and you should'nt have a problem, i've had a few issues with optimas aswell but only cause they were siting around and they went flat, once there dead flat they never come back to life as ed suggested.
Trickle charges are the way to go i would'nt recomend disconnecting the battery the trickle charger will keep it at 12.5- 13 volts constantly that way it will never go flat.
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