THEY REPLACED BATTERY BECAUSE IT WASN'T CHARGING. NOW IT KEEPS RANDOMLY SHUTTING DOWN. WILL HAVE TO RETURN =(.IT APPEARS THE ISSUE COULD BE AS SIMPLE AS USING A GENUINE DELL BATTERY INSTEAD OF AFTERMARKET.Turning off randomly. I've read other reviewers who have returned their computers because of this. It appears that when you install an non Dell battery in a Dell laptop, there's supposed to be a chip inside that confirms it's a genuine battery but the aftermarket has not mastered this and it will lose connection no longer telling the laptop how much juice is left. You then get a popup that says your battery is critically low. The laptop then wants to go into sleep/hibernation mode.