Batteries die in winter because they've been slowly losing capacity all summer. Here's what's actually happening and how to get ahead of it.
A car battery's chemistry slows down as temperature drops. At 32°F, a battery has roughly 65% of its rated cranking amps. At 0°F it's closer to 40%. A healthy battery handles that easily. A battery that's already weak from summer heat exposure (heat is actually harder on batteries than cold) simply can't start the car on the first cold morning.
Turn the key to accessory (don't start it) and watch the dome light. If it dims noticeably when you crank the starter, the battery is weak. If it stays bright and cranking is strong, you're probably fine for now. Either way, a $20 battery test is free at Hahn — cheaper than a tow.
Call (707) 544-5080 or schedule online. We confirm within one business day.
Call (707) 544-5080 Schedule Service