Most people keep their laptops close to them. If use it on your bed, it might not get proper ventilation, it will stay warm and the battery is going to suffer. Place your laptop on your desk or a laptop table. Or we keep our laptops plugged in all the time, thinking the battery should always be full, and we use laptops as desktops. But then the battery doesn't go through its normal charge-discharge cycles and isn't working as it was intended to, so you end up losing that battery life. Use a laptop like a laptop, and give it good ventilation.