Keep the laptop unplugged. If you use your dell laptop as a desktop replacement, try unplugging it when it's not in use. Take care to unplug the charger from the wall too; otherwise, it consumes electricity.
Only charge it when it needs charging. Keeping the laptop charging all the time actually weakens the battery's power. Soon enough, you'll have to keep it plugged in all the time which is exactly what you're trying to avoid. Be sure to only charge it when the laptop tells you it needs charging and unplug the charger when the battery is full.
Remove the battery of the laptop. It should be located on the bottom side of the laptop. You might need to slide some clips along to allow the battery to be removed. You will, however, have to keep your laptop plugged in all the time, but this method makes the battery last longer. Use the battery only when you need to take your laptop outdoors. Make sure the battery is charged up to at least 70% before you remove it from the computer. This keeps it ready for use, and it eliminates the possibility of it being drained when you need it.
Turn off the laptop and unplug it when it's not in use. If you need to step out of the room for more than half an hour, it's best to save electricity and the battery by shutting it down.
For long term storage, lithium-ion batteries should be at least half-charged. Store them safely in a warm, dry location.
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