While there are plenty of variables that could play into your laptop battery losing its charge, we’ve narrowed down the most popular causes into three key culprits: power cord issues, software malfunction, and declining battery health. Power cord issues Taking your laptop from place to place means taking your laptop charger along with you, too. ^{Take out your laptop battery—if it's detachable—then put it back in. Try turning the laptop on, and if it doesn't start, remove the battery again and hold the power button for 10 seconds to drain the remaining juice from your laptop. Then, plug in your charging cord and see if your device charges and turns on. If your laptop is plugged in} .