I have a Compaq Presario CQ61-411wm running Windows 7. The original battery died on it so I bought a new double life battery from HP a few months ago. Since I first put it in it randomly shuts down only when the battery gets around 50%. I will rule out overheating because I am always hitting the fans with air to keep them clean, and I think it would overheat more if the plug was in anyway. I have read that when it hibernates (which is really what it is doing)it could be the plan, I tried that fix and there is no option in Windows 7 to turn it off hibernate, unless I put it to sleep or shut down. I am wondering if there is any fix for this problem as I have not found one yet.