Lifespan The average lifespan of a car battery is three to five years, but the exact time depends on factors like temperature exposure and driving habits. Since batteries are usually located under the hood, the extreme heat during the summer months can begin to discharge the battery in under 48 hours. Heat evaporates liquids inside the battery, resulting in internal damage that shortens the lifespan.
Your driving habits also impact battery life. Stop-start driving (which shuts down your car engine at stoplights to save fuel), or frequently driving for less than 20 minutes uses battery power without giving the alternator enough time to recharge. By repeatedly draining the battery to low levels, you also shorten the lifespan.