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Ultimate source: www.thoughtco.com/how-to-revive-a-dead-car-battery-4155742 Every time a driver turns the ignition key or presses the “Start” button, the starter motor is expected to crank the engine. This mechanism is caused by the 12-V flooded lead acid car battery, which is standard on virtually every vehicle on the road. Some cars carry a second battery, and trucks and RVs may carry a battery bank, linking several batteries. Similar batteries can be found in tractors, power equipment, motorcycles, powersports machines, snowmobiles, four-wheelers, and solar power backup systems, to name a few. Car batteries tend to last for several years, but lifespan depends on how they are used. The typical car battery, driven every day, properly charged, and never deep-cycled, could last upwards of 7 years, but that’s a best-case scenario. Most maintenance-free (read: replace on death) car batteries tend to last 4 to 7 years. Short car battery life, less than 3 or 4 years, can be related t