18650s are 18 mm in diameter. 26650s are 26 mm in diameter, so yes, they are much larger than a 18650. I run my saber for hours at troops. I just ran it for 3.5 hours (on and off, but on a great deal of the time) last week. That saber is a Neopixel Kylo. The battery was toast at the end of troop. No way an 18650 could have done that. 18650s will run the saber in your configuration for about an hour. Less with the trustfire than with the higher mAh batteries.
Left to right: 3400 mAh 18650, 4800 mAh 21700, 5200 mAh 26650
Tom
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