

This is FUD. Dell workstation class laptops are absolutely designed for running at full power with the lid closed (and for use with a docking station, in fact). That’s why it’s called a “workstation”. Business class laptops are a totally different beast than consumer-grade/“gaming” laptops. They are typically quite durable, quite tolerant, and quite repairable. Exceptions, obviously, exist, and we don’t know the exact model OP is talking about, but there’s no reason to assume they will have any issues running it as intended.
I run several old consumer grade laptops as light servers, permanently closed, and they’ve been perfectly fine for years.



If you have an option in the BIOS or drivers to set the battery charging threshhold to stop charging at 80% or possibly even lower (I believe Lithium Ion/Polymer cells are happiest at around 40-60% state of charge, which is why they are usually shipped that way). Sometimes this feature exists, but only vaguely described as “battery life optimization” or some similar wankery that they never properly explain.
You can also just remove the battery entirely if it will be always plugged in, but setting it to a low/modest maximum charge gives you a nice, reliable, built-in UPS in case of power interruptions.