The battery in your vehicle is its primary source of electrical power. When it has been years since you last changed your vehicle's battery, and you notice that your vehicle is no longer in its top performance, then it is a sign that you need a battery replacement. Note that batteries have a sticker which indicates when you purchased it and how long it is expect it to last. Batteries have a definite life-span after which their performance will start to decline, so they have to be replaced.
There are signs that your battery is starting to wear out. Your vehicle may not start quickly as it used to, or it requires a jump when you leave it sitting idle for a couple of days. The moment such signs appear, it's time for a battery replacement. Note that failure to maintain or replace a battery can lead to some serious damage to your vehicle; hence, it is a problem that has to be addressed as soon as possible.
These days, batteries are taking the brunt of the high loads from various accessories and innovations in the automotive industry. OEM car parts and accessories consume huge amounts of power which strains the battery. As such, battery replacement is an integral part of your vehicle's maintenance in order to get optimum performance. After a new battery is mounted in your vehicle, ask for a charging system test and check out the warranty period.