26650 will fit inside MHS Hilts; however there is no room for a board over the battery. There are no chassis disks for it, so if you went 26650 via MHS, you're going to have to be very creative with the engineering to keep it solid, safe, and enduring. I bought some 26650 holders (although they are very tight for protected circuit batteries). I did adapt them to a Hasbro Kylo Ren Chassis, and I believe I could probably adapt them to a MHS Disk Chassis, but it would be difficult. You would definitely have to plan the chassis carefully. There are other batteries out there between the 26650 and 18650. 18650s can run a single bladed saber for a decent amount of time. I have a neopixel saber that runs 18650s, and I get about 45 minutes out of it. If that isn't enough for your application, you could always plan for changeable battery system.
Tom
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