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<blockquote data-quote="bombastinator" data-source="post: 23671165" data-attributes="member: 43994">Not 100% that I understood that, but a ~3.7v battery is more or less a ~3.7v battery and if you have a smaller one it’s pretty easy to make it fit a larger space.&nbsp; Smaller can’t be done easily, but larger can.&nbsp; There are little sleeves that will make an 18650 fit in a 21700 or a 26650 (the sleeves are different).&nbsp; This produces opportunity for extreme counterfeiting too.&nbsp; I remember an “18650” that was actually a cigalike battery with bubble wrap around it hidden inside the case of a real 18650 for example.&nbsp; It would test as a real battery, it just didn’t have very many actual amps in it because most of the battery was bubble wrap. I have found that 21700s are imho a bit better than either 18650s or 26650s because they last long enough for me at least, to recharge another battery while vaping that one so one can get away with just two batteries and a charger.&nbsp; The 26650s didn’t work all that well, because since they were bigger they took longer to charge, and one tended to kill one battery before the other was ready, necessitating 3 batteries.&nbsp; An 18650 was even worse (unless you had a two battery mod) because it had more or less the same problem.&nbsp; Double 18650 mods didn’t though because you would then charge two batteries at once, halving charging time.&nbsp; This is the whole “charger and multiple batteries” power.&nbsp; You swap them and always have a charged device.So ironically 21700s work better than 26650s because they’re smaller.&nbsp; Who’da thunkit?&nbsp; A 26650 is about two 18650s but charges at the speed of 1 18650 (which is too slow) while a 21700 is about 1.5x which is enough.&nbsp; So 3 18650s, or 3 26650s, but only 2 21700s to make a single battery mod work. I’ve seen double 21700 mods but they don’t make a ton of sense for my use case.&nbsp; They’re popular though, apparently because there are a lot of them.&nbsp; An all day vape or something.</blockquote>

[QUOTE="bombastinator, post: 23671165, member: 43994"] Not 100% that I understood that, but a ~3.7v battery is more or less a ~3.7v battery and if you have a smaller one it’s pretty easy to make it fit a larger space. Smaller can’t be done easily, but larger can. There are little sleeves that will make an 18650 fit in a 21700 or a 26650 (the sleeves are different). This produces opportunity for extreme counterfeiting too. I remember an “18650” that was actually a cigalike battery with bubble wrap around it hidden inside the case of a real 18650 for example. It would test as a real battery, it just didn’t have very many actual amps in it because most of the battery was bubble wrap. I have found that 21700s are imho a bit better than either 18650s or 26650s because they last long enough for me at least, to recharge another battery while vaping that one so one can get away with just two batteries and a charger. The 26650s didn’t work all that well, because since they were bigger they took longer to charge, and one tended to kill one battery before the other was ready, necessitating 3 batteries. An 18650 was even worse (unless you had a two battery mod) because it had more or less the same problem. Double 18650 mods didn’t though because you would then charge two batteries at once, halving charging time. This is the whole “charger and multiple batteries” power. You swap them and always have a charged device. So ironically 21700s work better than 26650s because they’re smaller. Who’da thunkit? A 26650 is about two 18650s but charges at the speed of 1 18650 (which is too slow) while a 21700 is about 1.5x which is enough. So 3 18650s, or 3 26650s, but only 2 21700s to make a single battery mod work. I’ve seen double 21700 mods but they don’t make a ton of sense for my use case. They’re popular though, apparently because there are a lot of them. An all day vape or something. [/QUOTE]

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