Instruction: Output yes if the supporting document can answer the given question. Otherwise, output no.

Input:
Question: Can anyone tell me what devices the 26650 battery can be used in? I bought 2 of these by mistake and have no use for them yet.
Document: The title says 2 pack but, if I paid for two i don't remember it and I didn't get two. I'm pretty sure this listing was for only one 26650 cell when I ordered mine but maybe there was a misunderstanding. Anyway, the cell is fine quality. It is up to standard for energy density as far as i can tell and it runs standard real world voltage for a 26650 cell, right at 4.0V. Mine worked right out of the box.
I ordered these batteries for use in a FOURSEVENS Maelstrom MMU-X3. For a charger I am using the 2014 New Version Nitecore I2 Universal Intelligent Charger.The batteries are branded TangsFire and rated at 6000mAh. Before first use, I charged both batteries overnight. I then placed each battery in the flashlight and left it on. With both batteries, the flashlight cut out after 30 minutes when on high power. The flashlight is supposed to go 2  hours on high.
Mine are labelled Tangsfire and fit fine in a small, single-battery Ultrafire flashlight. After charging them, and at least a month in the flashlight with occasional use, the battery still shows 4.1 volts. The one I haven't used shows 4.16.If you are using an 18850 with a plastic sleeve, I recommend upgrading to these. Using one of these made a huge difference in the amount of light produced.I'm sure these produce more voltage. I am not an electronics guy.
Good value. Great performance. Quick service. Needed for the huge flashlight I bought. I will look for more products using this 26650 size.
I like the batteries, they have the expected power and battery life. I usually charge them inside the flashlight. Wish it was easier to find an external charger for a decent price. I do love the re-charge ability of these batteries and the long life.Sometimes, I just use a charger that has a slider which is only designed for 18650 batteries.
I used two of these in my one cell flashlight and it was so bright that it actually melted the glass bezel. haha
I bought four so I can rotate fresh batteries in my tactical LED light. Work great, last over 10 hours.
Although they seem ever so slightly larger in diameter than the 26650 specification. If the casing is removed they're right size, but then you risk a short and/or fire if you're not careful. Maybe the spec is supposed to be excluding the casing, I dunno. Either way, they hold a good charge and seem to come with a decent PCB built into each unit.
These are very good (long lasting) batteries, at what I think is a high price.I revived a 1500 lum flashlight and this is the battery it took. I also had to buy a charger that would fit these.The flashlight is incredibly bright using these battery's.
I have purchased 2 sets of these and it seems that I always get one that is bad. This last batch one is awesome and one doesn't hold a charge for very long. So basically you pay $16 for one good batter. Next time I am sticking to trustfire.
Answer: yes