I just tested one on a discharged 3s lipo, 10.7v. Speed went up a lot, about 30% on my tester. I left it on sweep mode for a few minutes, when I came back it had stopped.
I assumed it had destroyed itself, but actually it was the tester that died! The servo is still good, and had only warmed up slightly.
I'll see if I can repair my tester and try again with some load on the servo. If I get 20mins of issue-free run time on the tester, I'll try it in a heli.
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