lots of garbage being promoted.are these guides merely generated by bots?
most of the information is wildly innaccurate and the batteries shown are fraudulent with the exception of the nitecore.i have had a few of those and they were ok.
look at that gtl closely while reading.
I think anyone can write a guide. Give it a try, write one for batteries containing a combination of unobtainium and youwishitwerealine, which are capable of delivering eleventy billion mAh at 3.7v. Best thing is they can be recharged without a charger by placing them in a microwave oven for 15 minutes. Or alternatively, a conventional oven for 70 minutes.
It says Authored by Ebay. Wow, some straight buy garbage there except the Nitecore. Problem is many will follow the guide
and with my experiences with ebay buyers/idiots if that was in a guide some would try it!
surprised they havnt been sued over this crap.
i still think these so called guides are cooked up by bots to drive sales.those inside ebay have to know by now how much fraudulent garbage is being sold everyday and who is behind it.its called not biting the hand that feeds you/turning a blind eye to it and cashing in.
I sort of admire FastTech for giving a better idea of UltraFire 18650 3600mAh 
I think I have said it before, it is not a race who lies about capacity or not, capacity itself should not be a absolute value to judge a cell. All of the sudden the subject matter becomes complicated for the majority of people who just want to buy cells and not think a lot. Can't blame them for that, not everyone should think that many cells out there are fake on various levels.
So will that real 1200mAh capacity be achievable at 3A-3.5A since this is what is mostly all about, not 1A discharges.
These Ultrafire have various brand cells inside of various ages, the biggest no-no in multi-cell light configurations. I've heard many people say locally they do not care how much runtime they have but how bright the flashlight will be because they can buy 2 cells and recharge them rather than buying a Panasonic cell. These type of cells will never be able to give you high currents enough to have a bright light, so exactly what you wish for you don't get. There are other things to mention, but as I was saying things would be even more complicated for the simple or average buyer. Finally to mention some come with protection, some not, even if being advertized as protected.
These Ultrafire have various brand cells inside of various ages, the biggest no-no in multi-cell light configurations. I've heard many people say locally they do not care how much runtime they have but how bright the flashlight will be because they can buy 2 cells and recharge them rather than buying a Panasonic cell. These type of cells will never be able to give you high currents enough to have a bright light, so exactly what you wish for you don't get. There are other things to mention, but as I was saying things would be even more complicated for the simple or average buyer. Finally to mention some come with protection, some not, even if being advertized as protected.
I doubt that it’ll do any good, but I hit the ‘thumbs down’ and clicked on the ‘report’ button (say that the title is misleading… which is technically true: the guide is not about the ‘best lithium rechargeable batteries’).
1) sh!tfire is not the best brand
2) never trust manufacturers specs, which are optimistic at best.
the author must be unaware, that there are rechargers that safely charge both NiMH and Li-Ion batteries, lol…
and instead of a “sh!tfire is the best!” claim?? it would have been MORE useful, to simply list a runtime test with a 1A light… rolls eyes