Odyssey PC680 or Equivalant Questions

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I've run a PC680 for the last 3 years on my evo, its been nothing short of flawless on a DD. However, if you let the car sit for more than a week, and the battery is getting old, it may or may not hold a charge. The end of last winter my car wouldn't start a few times after being gone for a week or so and not driving, but then after I had decided to replace it (but hadn't actually done so) the car sat for a week when I was out west, got burried in snow, and fired right up. 9 days outside. I ran that battery all spring, summer, and fall, and finally replaced it with the Genesis in November. It's been flawless so far this winter, even after sitting for a week over xmas.