I recently replaced the battery in my laptop. I brought it up to full charge and thought everything was fine until I tried to start the computer on battery power. It works fine on AC but when the battery meter drops to 65% or below, the laptop will not startup on battery power. When I plug it into AC it will startup with no problem and I can then disconnect the AC power and it operates just fine on battery but still will not startup on battery power alone. I contacted ASUS tech support and tried several of their suggestions: 1. Hard reset; 2. Opened "Control Panel" went to "Batteries" and checked to see if the drivers were current and they were all up to date; and 3. Reset the BIOS. None of these has helped the issue. I run Windows 8.1. When I put the old battery back in, the laptop restarts and runs just fine on battery power. Any suggestions from anyone out there?