If you are happy with the TIP… do you want a direct replacement? It seems they are still being sold.
https://www.amazon.com/Nitecore-SE-Rechargeable-Keychain-Flashlight/dp/B07DQMXLCX?tag=namespacebran369-20&asc_source=01GTA1FEXXTTTAXWQRBN3ZDNEA&th=1
EDIT: I see that this is the “SE” version. I don’t know what the difference(s) is/are
With a good AAA cylindrical light, I don’t think you would notice the difference in your pocket. At least, I don’t even notice the little Fenix on my keychain. The problem is that most of them that I have seen that are nice and small, are twisties. Even at that, I can use the light effectively with one hand. But you know what you want… until maybe you give something else a chance… 
I like the Fenix E03r v2. I reviewed it and it’s a nice keychain light. All aluminum, about 39 grams, USB c rechargable and 500 lumens with a red light and simple UI. My current keychain light is a Fenix Elite, but lower output than you want. I also like the Olight i1r 2 pro eos. Tiny, bright and rechargable 2 modes.
I tested the E03R v2 and liked it overall https://1lumen.com/review/fenix-e03r-v2/
Yes that is nice
Ah yes, that’s the next generation after mine I believe. This is what I have (although it’s aluminum not SS):
I could live with another TIP, although the lockout mechanism leaves something to be desired on my 1st gen version.
Excellent, thank you!
Good point, AAA would be significantly smaller than the ones that @raccoon suggests with their integrated battery. I didn’t really consider AAA models because I need a bit more power. I suppose it could be Li-Ion 10440 but it’s hard for me to receive uninstalled Li-Ions via mail.
a keychain light with a 10440 battery option:
Silver Fox with USB 10440 for about $20,
but its a twisty, and opening the light to get to the battery is not as convenient as a light w a USB port
I think you might be happiest with a new Tip.
Surprised at the “not a twisty” requirement, as those are the only ones I had which never turned themselves on accidentally.
I still like the i1R2 or whatever they’re confusingly called.
The v2 has a captive cap that you fully unscrew to charge, but it doesn’t fall off entirely. Got that one on one of those looooooong lanyards that I can wear it like a geeky necklace when I’m not wearing anything with pockets.
There’s a newer version that’s a bit fatter and has a bit more oomf.
All these have 2-stage switches, so twist a little gives you low, twist a bit more gives you high. Handy.
Oh, and there’s the rectangular Thrunite(?) that has 2 emitters. The one I got has white and UV.
No lockout, so the side-button can accidentally turn on the light if squished in a pocket.
I had all 3 of these (thin/fat i1R2s, and the Thrunite), but Hell if I can find them. Had them all here on the table, but I get the feeling some feline influence “hid” them on me.
OLIGHT i1R 2 EOS 150 Lumens Tiny Rechargeable Keychain Flashlight EDC Mini LED Keyring Light with Built-in Battery for Camping Hiking Dog Walking etc (Desert Tan) https://a.co/d/fL17Voo
This converts to a Canon eos SLR camera when needed. LOL
Yeah, that’s true, except the opposite also applies, I can never turn on a twisty quickly on purpose, especially if I have just one hand free.
Hmm…
Sure it’s not a Nitecore?
There’s also this one:
https://www.amazon.com/BORUIT-Small-Powerful-Flashlight-365nm/dp/B0C2H29F2M
Those i2Rs are easy to twist, even one-handy. Nice feel, like thickly-greased threads.
Literally, I’d spend more time fumbling around trying to find a button than just grabbing’n’twisting.
And I thought it was a Thrunite. Lumintop? Pretty sure I reviewed it here, too. All metal. Pretty purple. White+UV emitters. Side-button. Bit of a clumsy UI but easy to figure out in a pinch as far as press’n’hold vs 2click, etc.
Vaguely recall that purple only came in white+UV, whereas gray and other colors were white and red, which was actually what I wanted. But I wanted the purple ano more. 
How about a Lumintop GT Nano? It’s decently small while offering room to grow with different body tubes if needed.
Hi there, thanks for the suggestion. It looks like an incredible product, but probably not for my keychain, as the high-profile head is a bit much for pocket carrying.
This maybe?
Naw, “turbo” lasts all of 3.2sec or so. I saw The Flasholic’s review and that’s all it did before dropping down to low or whatever. Toy…
Wut?? Ain’t my light(s). Ain’t even my hand. Where’d that come from?
Ah, found it! It’s a Trustfire. Aaaaand it’s a “Minix”, which someone mentioned (ah, acobp).
Huh… name didn’t sound familiar at all, but there ya go.
Tried playing with it, but it just kept 2blinking with any button-press, so guessing it’s dead. Charging it now…
AAA would be smaller than the RovyVon Aurora A23, but larger than the RovyVon Aurora A3 or Tunenge S15.
I have a AAA keychain light (the Zanflare F3) that isn’t a twistie, but I think it was discontinued long ago.
Even though it isn’t a twistie, the flashlight would untwist in my pocket. 
Here’s another review of the Fenix E03R v2.0 with comparison photos that include a AAA and AA battery.
https://budgetlightforum.com/t/review-fenix-e03r-v2-0/218354
It’s a larger keychain flashlight, but if I wanted a rectangular one, I think I’d get this one. 
By the way, @sb56637, what was wrong with BLF this morning?
Did something have to be unplugged and then plugged back in? 