Just arrived, bought ten flashlights with a weakness for keychains. Is TIP the best? Ion tenth anniversary? Acebeam UC15?
Nitecore tube
How big can you go? For me nothing beats the Fenix E15 for size, runtime efficiency, beam quality, and durability (with Nichia 219 HCRI modded in of course!).
It is a cr123 light so some could consider it too fat for keychain use.
the TIP is great, but to big for key chain in my opinion. The Nitecore TINI would be a better fit for the position
I second the Tini and the DQG tiny AA runs a close second.
Nah, if you want SMALL and you’re going DQG, then the Hobi is the keychain light to look at. It’s expensive for its size, and uses a hard-to-get battery size, but it’s very small, and surprisingly bright!
One of the more interesting keychain lights in my database is the Ultratac K18 Mini. And I don’t think anyone has reviewed it either. It’s on amazon for like $16.
Another one that I’ve been fascinated by (but might be completely useless) is the Streamlight KeyMate USB.
Nah, hard to get battery, expensive. Or easy to get battery and affordable. 
+1,
Super small, sufficient light for my EDC needs, poly carbonate body does not get scratched by keys. It’s perfect.
I also love the Manker LAD, but is currently a shelf queen.
Yeah, but an AA light for keychain? I hate my car fob/key because it feels too bulky in my pocket!
I have a few Tubes, Tips and the UC15.
It really depends on what you are comfortable with. The Tube is the easiest to carry on a keychain. Tip has more power than you are likely to ever need on a keychain. The UC15 is just plain fun but too large and heavy for the keychain. I use 2 10440s and the brightness competes with my 18650s. Plus the red and UV to play with. Pretty much usless for me but fun.
If you want to look at DQG, try the Tiny AAA.
I always come in these threads looking for something exciting that has a real lock out and I always leave disappointed.
That Ultratac appears to have a real electronic lockout but I question it’s reliability @ that price point.
Probably one of the most debated questions. It all depends.
LMH
HML
MLH
MHL
AA, AAA, CR2, Button-cell, Rechargeable Polymer, CR123
Aluminum, Ti, SS, Copper, Brass,
Twisty, clicky, electronic
Reflector, TIR
……
Maybe this thread can help with some more choices!!
Not much love for the UC15 but it has a real lockout.
the website doesnt mention any lockout, how does it work?
From off you hold button down until it blinks 3 times (about 5 sec). Revese to undo. Works great.
That would seem like an important feature to have listed on the website. I wonder why no mention of it?
Hey, that RovyVon light you linked there (in that other thread). That thing has everything! It’s tiny. It has built-in charging, a built-in 130mAh cell (that’s 40mAh more than the 10180 in my Hobi), a side-switch, and 550 lumens from a XP-G3! And I wonder if this is true:
If they mean a Lithium Polymer, that would explain the 550lm ability. 
I think its just xpg3 that gives it that mostly. Its low-high-med-strobe with no lockout. 2 dealbreakers for me