battery care

My laptop shuts down when the battery charge is above 40%. Is the battery dying? Here are some details about the battery from the app "batterycare": -current battery capacity: 100% -battery remaining time: 3h58minutes -battery status: full charge -discharge cycle progress: 7/30 -Designed...

Is it a general rule to unplug devices when they're charged so that the battery doesn't get over-loaded or does it depend on the device? Like I heard some devices will automatically stop drawing power once they reach the full limit. I was kind of under the impression all charging devices work...