Dead car/truck battery at 11 pm at a Dennys off the Interstate is a pain in the ass. I replace them at three years whether they need it or not. Cheap insurance.
Solid advice.
The best advice given thus far. Taught my daughters to buy 60 month battery's and replace at 48-months. Standing around in the dark hoping a stranger jumping your car doesn't jump you first is a bad plan. $125 to $150 more or less for a battery is cheap insurnace.
