1. Parasitic drain: All cars have a small amount of parasitic drain, which is the amount of power that the car's electrical system draws when the car is turned off. This power is used to power things like the clock, the alarm system, and the memory settings for the radio. Over time, this parasitic drain can drain the battery if the car is not driven regularly.
2. Sulfation: Sulfation is a process that occurs when lead-acid batteries are not fully charged. When a battery is sulfated, the lead sulfate crystals that form on the battery plates can block the flow of electricity, making it difficult for the battery to hold a charge. Sulfation can be caused by leaving the battery in a discharged state for too long, or by not charging the battery properly.
3. Extreme temperatures: Extreme temperatures can also shorten the life of a car battery. Cold temperatures can make it difficult for the battery to hold a charge, while high temperatures can damage the battery's internal components.
Here are some tips to help prevent your car battery from going dead when sitting:
* Drive your car regularly. This will help to keep the battery charged.
* If you don't plan to drive your car for a long period of time, disconnect the battery or use a trickle charger to keep it charged.
* Keep the battery terminals clean and free of corrosion.
* Avoid leaving the car lights on or the radio playing when the car is turned off.
* Have the battery tested regularly, especially if it is more than three years old.
