Trying out a Joye LR510/18650 combo right now, hits great!
I did have some issues with some generic 2.0 LR510's a few days back. The center post on every one was really indented. You could pull it out some for better contact, carefully.. but it wouldn't stay. They didn't hit consistently in the UFS without really cranking the telescope down or removing the o ring right above the battery end of the center pin (and that seemed important to keep where it was...) Other than that, every other 510 I've thrown at it has worked very very well.
BTW- baddao, love the avatar. I saw Tom in St. Louis 2 years back, best show I've ever been to!