MX5S Flashlight, retail $10 (
Manufactured by (Not known) (URL is unknown too)
Last updated 08-12-04

It looks a bit like an Inova X5T, but uses a single AA cell instead of two CR123A cells. Hence, it's shorter than the X5T. But it has five white LEDs in the bezel, has longitudinal flutes milled into the body, and has an on/off/momentary function on the tailcap. So it does sort of look and work like the Inova X5T.

I bought this flashlight on ebay, and it did not come with any type of retail packaging.


Put a battery in this flashlight first (see below), and then you'll be ready to go to town.

Twist the tailcap clockwise (as if tightening it) to turn the light on, and turn the tailcap counterclockwise (as if loosening it) to turn the light off.

Momentary (signalling) operation is available. Unscrew the tailcap about 1/20th of a turn from when the flashlight first turns off. Press in and hold the tailcap for as long as you need the light; relieve the pressure on the tailcap to turn the light off.

To change the AA cell in this flashlight, unscrew and remove the tailcap, and set it aside. Remove the used AA cell out of the barrel, and dispose of or recycle it as you see fit. Insert a new AA cell in the barrel, button (+) positive end first, then screw the tailcap back on. Unscrew it slightly when your MX5S springs to life.

Current consumption was measured at 190mA, using the DMM's 2A scale.

As of 04-26-04 at 9:10am PDT, a battery discharge analysis of this flashlight is underway.
As of 04-27-04 at 8:36am PDT, the battery test is still underway.
It started with an arbitrary value of 2.276, and it's now at 0.310.
As of 9:10am PDT (exactly 24 hours into the test), the reading is 0.274. I'll stop the test and make a graph when the reading drops below 0.100.

And here's the chart. It's 3:20pm PDT on 04-27-04, so it ran for just over 30 hours for this test.
I don't know what "hitch" is in hour 26. so please do not ask.

I'll be running another battery discharge analysis test using a NiMH rechargeable cell. As soon as the charger is finished, I'll start the test.
Ehhh, doodlebugs!!! I just screwed up the test, so I'll start a new test with another cell.

I somehow managed to queer this test about ten minutes in, so I recharged the cell, and (as of 7:25pm PDT) started another.

As of 7:46pm PDT, I screwed up the next test, so when the cells are ready, I'll try it for a third time.
Third time's a charm, right?

Looks like I'll be running this test tomorrow (04-29-04) since I'll need to keep an eye on it so I can stop the test before the battery becomes damaged.

This test was run to the 25% intensity point, so as to prevent damage to the NiMH cell by overdischarge.
I managed to queer the test I started this morning just before starting this one.
That's what...three or four ruined tests before this graph was successfully produced. :-/

For reference purposes, the above test was started at 9:35am PDT and finished at approximately 8:15pm PDT.

The MX5S appears to be reasonably durable. The entire flashlight is made out of aluminum, and ordinary flashlight accidents should not be enough to do it in. I beat the flashlight against a steel rod 10 times (five on the barrel, and five on or very near the bezel) and did not damage the flashlight in any fashion or cause it to malfunction.

Water resistance is another matter. When the tailcap was removed, the battery was removed, and the flashlight was suctioned, air had no problems whatsoever getting in. You could probably use the flashlight as a drinking straw in an emergency though I highly discourage that.

Knowing it is not submersible at all, please try to keep the flashlight out of creeks, rivers, streams, ponds, lakes, docks, oceansides, puddles of hyena pee, snowbanks, mud puddles, tubs, toilets, sinks, fishtanks, dog water dishes, or other places where water or water-like liquids might be found. If you know or suspect it fell into water, remove the tailcap and battery, and set the parts in a warm dry place for a day or so, and you ought to be alright. If it fell in seawater or if something peed on it, douche the parts out with fresh water before setting them out to dry.
Note: Do not use the flashlight as a straw if someone or something pissed on it.

The beam is smooth, with a cool, icy bluish white color to it. The overall color appears cooler white than the white LED Inova X5. It is significanly dimmer than the Inova X5 though; so you'll want to know that before going in. It isn't a horrible, awful flashlight; but is dimmer than the Inova.

Beam photo at ~12".
Measures 26,400mcd on a Meterman LM631 light meter.

Test unit was purchased on Ebay and was received on 04-23-04.
The link to the listing I use is right here. This page expires on 0-7-07-04, so use the View seller's other items link in that case, to see if they're still selling this flashlight.

UPDATE: 00-00-00

Tough aluminum body
Long battery life
Uses a battery that is relatively inexpensive and readily available

Not very water-resistant
Dimmer than expected - though it's not a horrible, awful flashlight; don't get me wrong here

    PRODUCT TYPE: Small handheld flashlight
    LAMP TYPE: 5mm white LED
    No. OF LAMPS: 5
    BEAM TYPE: Narrow flood; central hotspot with soft fall-off
    SWITCH TYPE: Twist tailcap on/off, push tailcap momentary
    BEZEL: LEDs inset into individual cells
    BATTERY: 1x AA cell
    WATER RESISTANT: Light weather-resistance only
    WARRANTY: Unknown/TBA


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MX5S Flashlight * (URL not known)

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