Which flashlight? Convoy S2, S3, S5, or S6?

LED Flashlights – General Info 18650 Flashlights
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I don't know how, but the S6 might be shorter than the Xiaozhi.

EDIT: Nope it's not shorter. Turns out it's a little too narrow for some protected cells.

Here's a quote and pic from a mini-review of the Convoy S6.

https://budgetlightforum.com/t/-/18936 Convoy S6 from Fasttech Mini-Review (XIAOZHI clone)

[quote=mhanlen] it still only accepts unprotected batteries.

[/quote]