Car batteries, like most other parts for your car, can come with a warranty. The types of warranties that are available vary depending on brand and type, whether a wet/flood, gel, calcium or lithium ion battery. A car battery warranty can be as long as 6 months and last as long as the life of the battery, which generally is no more than 6 years. If the length of a warranty is important to you, you should purchase the battery that gives you the longest protection. Understand also that some car battery manufacturers place limitations or restrictions on how the battery is installed and if not installed properly, the battery’s warranty can become invalid.