Hi...
Many of us use our laptops as you do--as our primary computer, always plugged in. If your laptop is capable of being powered by the AC adapter alone (without the battery in), then for best battery life, it may make sense to remove the battery when your laptop is plugged in, depending on your circumstances.
The reason for this is that laptop batteries can age more quickly when they're fully charged and hot for long periods of time. High heat and laptop over heating is one of the worst things for all of the laptop's hardware parts, including the battery. And as you probably already know, laptops tend to get very hot. Some intensive usage can drive up the amount of heat your laptop produces.
If you often use your laptop for high-powered tasks like game playing and multimedia editing, remove the battery to protect it from the heat.
Note: While I am an Acer employee or contracted employee, my contributions to Acer Community are my own and not representative of Acer or its views.