ENERCELL NANO KEYCHAIN LED FLASHLIGHT
Enercell Nano Keychain LED Flashlight, retail $8.99 ()
Manufactured by (Unknown) for Ignition L.P. (www.corporationwiki.com...)
Last updated 08-19-13
The Enercell Nano Keychain LED Flashlight is a small (keychain-sized) LED flashlight that features a remarkably potent white LED, which has a somewhat adjustable beam focus.
It comes in a sturdy metal body that appears to have a Type II anodized finish.
And it feeds that white LED with a quartet of AG13 (LR44) button cells.
SIZE
This flashlight came to me ready to use; the batteries are alrady installed.
Once it's fed, press the black button on the tailcap very firmly and then release it to turn the light on in continuous mode. Press and release the button the same way again to turn the light off. The button has a rather faint "click" sound to it that you can hear if your surroundings aren't too loud.
Press the button more lightly and hold it that way for as long as you need light, and release it to turn the flashlight back off. This is intermittent or "signalling" mode.
The flashlight's focus is somewhat adjustable, simply pull out or push in on the bezel (the flashlight's "business end"). This can be accomplished single-handed -- that is, the same hand holding the flashlight can simultaneously be used to adjust the focus.
Unscrew and remove the tailcap, and throw it in the john...O WAIT!!! YOU'LL NEED THAT!!! So just set it aside instead. ;-)
Tip the four used LR44 button cells out of the barrel and into your hand, and dispose of or recycle them as you see fit.
Stack four new LR44 button cells on top of one another on a flat surface like a table or a counter. Stack them button-end (-) negative up. Lower the flashlight barrel over the stack of cells, and slide it to the edge of the table or counter. Place a thumb or finger next to the flashlight barrel, so it will cover the open end when you slide the barrel off the table or counter. You don't want those batteries to just fall out and clatter all over the floor now, do you?
When you have the flashlight barrel over the table's or counter's edge, invert (flip over) the unit so the open end is now facing up. Remove your finger or thumb from the open end of the flashlight's barrel, and screw the tailcap back on.
Aren't you glad you didn't huck that tailcap in the commode now? 
The Enercell Nano Keychain LED Flashlight appears to be reasonably durable. When the tailcap was removed and the flashlight was suctioned, it held a vacuumm, so it's not just weather-resistant, it is probably water-resistant too. So if it falls into shallow water, just fish it out, shake it off, and keep going.
But if it falls over the side of a boat in the middle of the ocean, you're probably screwed.
The beam quality is a tad bit on the low side, but not so bad that you would become angry with the flashlight and flush it or dash it into one of those wall-mounted porcelain uranators to see if it explodes (the flashlight, not the pisser!).
Beam photograph (narrow beam) on the test target at 12".
Measures 264,000mcd.
Beam photograph (wide beam) on the test target at 12".
Measures 125,900mcd.
Both measurements were taken on an Amprobe LM631A light meter.
Beam photograph on a wall (narrow beam) at ~10 feet.
Beam photograph on a wall (wide beam) at ~10 feet.
Spectrographic analysis of the LED in this flashlight.
Spectrographic analysis of the LED in this flashlight; spectrometer's response narrowed to a band between 430nm and 470nm to pinpoint native emission peak wavelength, which is 449.060nm.
The raw spectrometer data (tab-delimited that can be loaded into Excel) is at http://ledmuseum.candlepower.us/43/ecnano.txt
USB2000 Spectrometer graciously donated by P.L.
Beam cross-sectional analysis (narrow beam).
Beam cross-sectional analysis (wide beam).
Images made using the ProMetric System by Radiant Imaging.
TEST NOTES:
Test unit was purchased at a Radio Shack store in Federal Way WA. USA on the morning of 08-28-12.
UPDATE: 00-00-00
PROS:
Bright for its size
Reasonably durable construction
CONS:
Uses batteries that may be difficult to find or locally expen$ive
Beam quality could have been a bit better
Tailcap should be firmly tightened (hand-tight) or else the switch isn't reliable
MANUFACTURER: Ignition L.P.
PRODUCT TYPE: Keychain-sized LED flashlight
LAMP TYPE: 5mm white LED
No. OF LAMPS: 1
BEAM TYPE: Somewhat variable medium spot
SWITCH TYPE: Pushbutton on/off/momentary on tailcap
CASE MATERIAL: Metal
BEZEL: Metal; LED protected by plastic focusing lens
BATTERY: 4 AG13 button cells
CURRENT CONSUMPTION:
WATER- AND URANATION-RESISTANT: Weather-resistant at minimum
SUBMERSIBLE: HOZAY FELIACIANO TRAGEN EINE URIN-GEFÜLLTE WINDEL, NEIN! 
ACCESSORIES: 4 AG13 (LR44) button cells
SIZE: 70mm L x 20.50mm Dia.
WEIGHT: 29.20g
COUNTRY OF MANUFACTURE: China
WARRANTY: Unknown/not stated
PRODUCT RATING:
Enercell Nano Keychain LED Flashlight *
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