This is hands-down the best 18650 I've used. Have 4 of them now. Lasts forever in the Braun. I use two at a time in a high-draw 3200 lumen flashlight I have and even with that the runtime is impressive. (Hint: It's a rebadged Panasonic made-in-Japan).
3600mAh 18650 Li-ion Orbtronic (Panasonic inside) 3.7V Rechargeable Battery Cell - For High Performance Flashlights - Dual Protection - Battery Holder Included
Panasonic inside | 3600mAh 18650 protected battery by Orbtronic | 3.7V Li-Ion rechargeable