Hill all, I’ve just purchased a fenix tk11 (r5). I know, very out of date now, but I haven’t had a fenix before and noticed this one on amazon for £39.00. Couldn’t resist, I thought what a nice looking design for a tactical light, simple interface and I bet it’s as tough as buggery. And if I like it, maybe I’ll buy a newer fenix later. I do like it, yes I’ve got newer torches from olight and thrunite with over a 1000 lumens but I like the simplicity of this. A nice protruding forward clicky, and a slight head twist to change between high and low. 258 lumens with this beam in the real world is plenty bright out to 100m.my only niggle is the battery tube being tight, I’ve got a few different protected 18650s and they’re all tight, broken the wrapper on 1 and started to on another. To get a battery out, I have to remove the tailcap and head so I can push it out. My question…. would the likes of an efest 3500 mah IMr be a better fit and would flat top be OK? The instructions do say to use protected 18650 though? I’ve never messed with unprotected. Many thanks if you’ve had any experience with this issue.