electronicstix 1000mah protected cr2s work with 510 attys with the washer, vaping it now
Yes but... that's not a Joye 510 which is what a LOT of places sell (like AltSmoke for example

) and which a number of people seem to think are better quality. That would be a SBE(?) 510 that's made with a washer. The ones with a washer generally measure a couple of tenths more ohms resistance which may explain why they're working for you.
Let's talk about those batteries. I just got mine.
They're green.
They don't say "UltraFire" anywhere on them.
They don't say "Protected" anywhere on them.
They DO have that telltale indentation towards the positive end cap.
All they have printed on them is "LC 15266 1000mAh 3.0V"
They came shrink wrapped in two's.
3 of 4 measured exactly 3.365v out of the shrink wrap.
The 4th one was disconnected?? put it on the charger and it took 2 hours for the charger to go green.
It came off the charger at 3.551v and after sitting for a while it measures 3.428
The charger is labeled:
Output: 2x3.7V - 300mA +/- 50mA
60mA at 1.5 hrs (standard Charge)
300mA at 2.4 hrs (Quick Charge)
Charger output is 4.02v (measured)
...I think I'm happy but I'm not sure... doesn't inspire extreme confidence.