Board Thread:Questions and answers/@comment-3362895-20151014105045/@comment-3362895-20151015085258

That's the other thing. I feel that the flywheels are not reaching maximum RPM, and they seem to be taking more time to spool up as well. Again, in spite of batteries that are good according to my battery tester device...

So, your theory of dust and/or debris accumulation does make some sense, but I wonder why both of my units suffer the same affliction. Maybe it's time I tried some 14500 Lithium-ions??