Is there a way to use a non-apple external display (monitor) without having my macbook air plugged in?

Just got a 27'' AOC monitor that I'm using with my Macbook Air (purchased in 2013). It's working great but as soon as I unplug the power adapter from my laptop the monitor goes black and says 'no signal'. I've been reading online that you need to have the power adapter plugged in to use an external monitor - my questions are: 1) does that harm the laptop's batter? if so, 2) is there a workaround? if there is no workaround, 3) does an Apple monitor also require that a laptop be plugged in for the external display to continue functioning while the laptop is in clamshell mode (closed lid)?
Thanks in advance for any advice

Thanks, Matt. In my case, the monitor definitely shuts off when I unplug the power from my laptop in clamshell mode. If the lid is open, however, the monitor continues to function even without the power adapter plugged into my laptop. Ideally, I'd like to have the lid closed on my laptop and be able to use the external monitor without having the power plugged into my laptop. That's what doesn't seem to work - if your does, please let me know if you have any pointers.
Thanks again!

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