HKJ specifies the Shockli 21700 4550mAh (Purple) you show in your video as being 70.9mm long. He has the Samsung 40T at 70.1mm (stores list it as 70.4mm). The Samsung 50E is listed by stores as 70.7mm. I hope the 40T and 50E will fit in an unmodified E07 without getting crushed. Crazy that they made the battery tube so short…