check this review/posting:
SUPER Cheap, small, light, brightish, not a bad item for its price -> but VERY poor product description:1 mode not 3, 100 lumens not 3500,not 10 watts, AAA not 18650, no strap.
under $3 shipped… from amazon (though it is still slow shipping from china)…
then i complained about it and they refunded all my money so it was free
wle
I will be posting my review of the lumentop tool this Friday. I think its very good for a clicky AAA.
Excellent choice.
These multicolor Rofis are dirt cheap and comes even with battery, single mode,120 lumens !
http://www.gearbest.com/led-flashlights/pp_466738.html?wid=21
What if you take an led, solder one pin to the head of the battery, and then run a tiny wire from the other pin to the bottom of the battery?
Then just touch the wire to the bottom to turn it on 
Barbie’s buzzcock.
The Thrunite t01 was way smaller smaller than I thought it would be. It also has a key-chain hole. Single mode twistie.
I picked up a second hand Ti version a few weeks back, lovely little light, I’ve connected it to a chain and wear it around my neck.
Here is said review of the Lumintop Tool.
Thrunite T01 is 9 grams and 65.6 mm(length)*14.2mm(head diameter). It’s tiny. Single mode twisty putting out around 100-120 lumens, with very little to go wrong. But beware of their “neutral white” version which is actually a very pronounced orange-yellow tint. Stick to the cool white which isn’t bluish and you are more likely to be pleased unless you like the look of candlelight. At $7 in a nice tin presentation box these are nice gifts. Expect 25-30 minutes from an alkaline and 40 from an Eneloop. Extremely pocketable.
That Thrunite seems like a good deal, but i can’t find it in any store except the Thrunite store, but that’s not free shipping…
L to R:
AAA Eneloop - 44mm, 11.7g
DQG Tiny AAA v2 - 57.4mm, 13g (Stainless Steel)
Olight i3E - 60.5mm, 7.9g
Thrunite T01 - 65.6mm, 9g
Jetbeam Jet μ - 70.4mm 13.2g
Lumintop Tool Ti - 74mm, 22g (Clicky, Titanium)
Microstream/A3 EOS Lego - 75mm, 15.4g (Clicky)
Maglite Solitaire - 82mm, 12.5g
Thrunite Ti5T - 90mm, 28g (Clicky, Titanium)
Peak LED Eiger - 93mm, 23.5g
BLF 348 - 90mm, 27.4g (Clicky, Stainless Steel)
this is the smallest lightest AAA ever
it is a zoom
one mode
cheap cheap cheap@@@@@@
$1.90 shipped!
under $2, that is right!!!
no i have no financial interest
read all the replies
i had to edit some of the original posting
wle
It’s larger than 6 of the lights in my pic and that is far from a comprehensive list.
An AAA cell an led soldered to positive contact thin wire wih resistor to negative
Won’t work, even a red LED needs 1.9 Volts.
as far as being longer than 6 other lights, how many of those are tail-button lights?
of course twisties are shorter but i hate twisties
wle
Two. The Tool Ti & the Streamlight/ITP lego.
That being said, let’s not forget that the original question wasn’t “What is the smallest/lightest tail switch AAA”. 
ok, i don;t care any more… it;s short and small and cheap and has a tail switch and it works well
wle