Hi,
Faster battery drain when connecting and using external monitors (whether DisplayLink or not) is something to be expected due to the fact that the GPU generates pixels not only for the MacBook's built-in screen, but also for the external monitor. How fast the battery drops also depends on the type of content being displayed. If it's constantly changing content, such as a movie playing, then the battery will drain faster. A second aspect is also the resolution of the video and how it was created. If it is a high-quality image transcoded on over the air, then the CPU and GPU are stretched enough to cause the battery level to drop faster. In the long term, however, this does not noticeably affect battery degradation.
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