Weird Gearbox Sound

[Jon Stratis]

Originally Posted by Monochron

It kind of looks to me like nothing more than a brown-out. The stuttering and flickery RSL are the normal symptoms of brownout, and a difference in gearbox sound (because you aren't giving the motors your normal 11-13 volts) is expected. If your battery read as 39% (3.9V?) then you were probably well below brownout levels.

The fact that no one else mentioned this has me worried that I missed something obvious though

Several people's first guess in the thread was dead battery, which is one way to cause a brown out. As there can be other root causes for brown outs, knowing that it was caused by a dead battery is a more precise (and more easily fixable) analysis.