WHEN REPLACING S550 outermost headlight bulb, is it ok to disconnect the red positive battery lead as shown in the video without a memory saver?

per headline.

https://www.youtube.com/watch?v=g3a6C9NWtG4&feature=youtu.be

 

It's my neighbor's car and he approached me for my experience coz i did my middle headlight bulb in my c300 2008 w204 and i did it the dangerous method, ie did not take the battery cable for red off mine :)

 

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Chris Smith made a comment.
10 months 3 weeks ago

If you could also tell me how to do ON-DASH VOLTAGE DISPLAY on the S550 then much appreciated. Thank You.

 

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