I just measured my 4s 4900, and it's about 6 3/4" long, or 172mm.
The big quaestion I have is if they fit into the same length tray as the Enerland 5000 cells fit. I know they are wider, But I have trays made 51mm wide and the same length as Mike's Enerland trays. If they fit my battery box I might consider trying one. I'm not gonna build a custom box just for that pack though.
I can't decide if its more fun
to make it...
or break it...