Batteries are very hit or miss. My Dell laptop is 4 years old and still has most of its battery capacity. My daughter's Dell lost its battery capacity in 2 years, as did my mother's. I did some asking around when I was trying to determine where to buy a new battey for my daughter, and found that some people bought new batteries that lasted years and other people bought new batteries that lasted just a few weeks. I've noticed on some manufacturers websites that they sell separate extended warranties for their batteries, separate from the rest of the computer I mean.