I think, it should fit, as a Keeppower 26650 (recommended for using in Convoy L6) also fits without any problem (you can add even 0.5 mm to the width of a Keeppower).
A few people mentioned, that with Keeppower, the UI behaves a bit strangely because of the protection circuitry (I also experienced that, but not too seriously), so I ordered a small batch of Liitokalas a few days before.