Guys, a battery lasts anywhere between 3 and 12 years (mine is 10½). It's stone cold simple; buy a Deltran, Ctek or Schumacher battery maintainer and use it over night once a week unless you're driving it almost every day. Driving the car simply won't bring an "older" battery up to 100%.
If you have a number of cars, consider those new glove box size lithium battery packs. Our Costco has both Deltran and the battery packs.
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