funny thing is my interstate batteries have never let me down.trans am in a cold garage over a year.bam started right up.
imho you should not have to trickle charge a battery.if the car is going to sit over 6 to 8 months just unhook it before storage and charge it if needed when the time comes.sounds like the optima regardless of color was not engineered correctly to hold a charge.thats my opinion and dont want to argue or go back and fourth over it.ive read 10 times more negative optima problem posts than better ones.i simply wont buy one so i guess they work fine for me/lol