The list of issues that can cause a car battery to die is so long as to approach neverending, but virtually every battery killer out there can be shoehorned into the three basic categories of battery problems, electrical system problems, and simple user error. Some of these can be dealt with at home, and others will probably require a visit to your mechanic, but there’s no way to know for sure until you roll up your sleeves and dig in.
It’s also important to note that when most people talk about a battery dying repeatedly, they are talking about a situation where the vehicle won’t start after it has been parked for any length of time. If your battery seems to die while you’re driving down the road, it’s more likely that you have some type of problem with the charging system (we’ll cover that situation as well).
Some of the most common reasons for a car battery to die repeatedly include loose or corroded battery connections, persistent electrical drains, charging problems, constantly demanding more power than the alternator can provide, and even extreme weather. Some of these problems are enough to kill a battery on their own, while others are usually coupled with a battery that is already weak or on its last legs.