Since I normally use it in AC mode, my computer turned on a setting where it only charges the battery to 80% to extend its operating life, but that doesn't do me any good if I need it off the charger for an extended period of time. I can't seem to find it to turn it off. I'm running Windows7 (please keep this professional). If you need anymore info, let me know I'll do my best to answer the questions within the question. I've tried every option in power settings but this one still eludes me.