- Apr 5, 2011
I've always bought the TrustFire 18650s from DX:
$7.88 - TrustFire Protected 18650 Lithium Battery (2500mAh 2-Pack Blue) - Batteries
So far, out of 6 or 8 cells, I've not had any problems.
That's quite a good price you've found.
Here are the UltraFire green 2600mAh rated ones on DX:
$9.72 - UltraFire 18650 3.7V 2600mAh Lithium Batteries (2-Pack) - Batteries
Looks like they got great reviews.