Avalon Netizen

My laptop works fine until I try to run second life when I have been running on battery power. As soon as I plug the mains plug in the battery / power icons flash constantly like it is going between maims power and battery power.I use Firestorm but have also tried Singularity which is no better. It's an asus G55 vw windows 10. As I say any other apps no problem , just when i start second life.