Hi, I have a Windows 7 Dell XPS 15Z laptop. I've always used this laptop with the charger plugged in because i rarely take it out of my house. I just downloaded this software called BatteryBar, it gives info about your battery, and i saw that my Battery Wear is at 60%.Should I keep using it while plugged in because it has an internal battery which I don't know how to replace or even remove. Thanks