Today I have the Fenix E02R keychain flashlight, a two mode flashlight with twisty user interface, and micro-USB charging.  Read on for testing!

Official Specs and Features of the Fenix E02R Keychain Flashlight

Here’s a link to the Fenix E02R Keychain flashlight product page.

Fenix E02R Keychain Flashlight Versions

There are three body colors, but just one version of the Fenix E02R Keychain flashlight.

e02r versions



The Fenix E02R Keychain flashlight is going for $23.95, and it’s available at right now!

Short Review

This is a predictable little keychain light, with fairly standard features, and seems reliable.

Long Review

The Big Table

Fenix E02R Keychain Flashlight
Emitter: Cree XP-G2
Price in USD at publication time: $23.95 at
Cell: Internal
High Runtime Graph Low Runtime Graph
Switch Type: Twisty
On-Board Charging? Yes
Charge Port Type: micro-USB
Charge Graph
Power off Charge Port No
Claimed Lumens (lm) 200
Measured Lumens (at 30s) 168 (84% of claim)*
Candela per Lumen 5.3
Claimed Throw (m) 49
Candela (Calculated) in cd (at 30s) 64lux @ 2.826m = 511cd
Throw (Calculated) (m) 45.2 (92.2% of claim)*
All my Fenix reviews!
  • Measurement disclaimer:  I am an amateur flashlight reviewer.  I don’t have $10,000 or even $1,000 worth of testing equipment.  I test output and such in PVC tubes!!  Please consider claims within 10% of what I measure to be perfectly reasonable (accurate, even).

What’s Included in the Fenix E02R Keychain Flashlight Package

what's included

  • Fenix E02R Keychain Flashlight
  • Charge cable (USB to micro-USB)
  • Split ring
  • Spare o-rings
  • Manual and papers

Package and Manual



Build Quality and Disassembly

main photo

The pictures might not tell the story immediately, but this is a tiny little light.

Here’s a top down view:

top down views top down views top down views top down views

The Fenix E02R keychain flashlight unscrews to the point you see below.  I could make it go no further, and I persuaded it not-so-gently.  Maybe there are some press fit pieces, or some loctite, but I couldn’t get these parts to part.

open view

So no real disassembly photos…. sorry!

Size and Comps

Length: 1.89″
Head Diameter: .59″
Body Diameter: .55″
Weight: .52 oz (Excluding Battery)

Funny that Fenix would list the weight without battery.  This just leads me to believe I never figured out how to remove the cell…..

If a light will headstand, I’ll show it here (usually the third photo).  If a light will tailstand, I’ll show that here, too (usually the fourth photo).

Here’s the test light with the venerable Convoy S2+.  Mine’s a custom “baked” edition Nichia 219b triple.  A very nice 18650 light.

And here’s the light beside my custom engraved TorchLAB BOSS 35, an 18350 light.  I reviewed the aluminum version of that light in both 35 and 70 format.

beside torchlab boss 35

A few other small lights, which are all 10180 powered.  I presume this Fenix E02R Keychain flashlight is too, but I don’t think Fenix states that.

with other small flashlights

Retention and Carry

There’s not much in the way of carry options for the Fenix E02R Keychain flashlight.  The split ring can attach through this tailcap.

tailcap loop

There is no pocket clip or magnet or otherwise.

Power and Runtime

As stated above, I was unable to disassemble this light, to see what cell is inside.  Almost certainly it’s a single 10180 cell though.  It’d be nice for this to be user replaceable, but that doesn’t seem like an option.

Here are runtimes for both modes.

runtime graph high runtime graph low

Output on High drops dramatically, and in both runtimes, the output trails off without seeming to offer low voltage protection at all.


With the built in battery, you’d expect on-board charging – and you’ll get it.  It’s in the form of a micro-USB port, which is revealed by unscrewing the body.

charge port

An appropriate cable is included – USB to micro-USB.

There’s also a charge indicator just beside the charge port.  When charging, the translucent dot is red.  When charge is complete, the dot turns to….  greenish – not quite green, but decidedly not red, too.

charge indicator

Charging is consistently around 0.1A, which should be fine for the built in battery.  This does take a while, at around 3 hours in my tests, though.

charge graph

Modes and Currents

Mode Mode Claimed Output (lm) Claimed Runtime Measured Lumens Tailcap Amps
High 200 25m 168 ?
Low 15 6.5h 14 ?

Pulse Width Modulation

No pwm is to be seen on either mode.

For reference, here’s a baseline shot, with all the room lights off and almost nothing hitting the sensor.  And here’s the worst PWM light I have ever owned.  Also one of the very first lights I ordered directly from China!

User Interface and Operation

The Fenix E02R keychain flashlight is a twist operated light.  But it’s unusual (ish) in that it’s a progressive twisty.

twist action in hand

It’s possible to twist the light with one hand, though the small size does complicate that.


Here’s a UI table!

State Action Result
Off Tighten Head Low
Low Tighten Head High
High Loosen Head Low
Low Loosen Head Off

LED and Beam

The product page says the Fenix E02R keychain flashlight has a Cree XP-G2 emitter.  I believe it’s cool, and the photos below support this.

emitter and tir

Fenix uses a very short TIR in the light, too.

on low

These beamshots are always with the following settings:  f8, ISO100, 0.3s shutter, and manual 5000K exposure.

Tint vs BLF-348 ( 219b version) (affiliate link)

Test light is on the left!

I compare everything to the 219b BLF-348, because it’s inexpensive and has the best tint!


What I like

  • Small size
  • Progressive twisty
  • Built in charging seems good

What I don’t like

  • Not able to be taken apart
  • Cool/green emitter


  • This light was provided by for review. I was not paid to write this review.
  • This content originally appeared at  Please visit there for the best experience!
  • For flashlight related patches, stickers, and gear, head over to PhotonPhreaks, another site where I write!
  • Use my referral link if you’re willing to help support making more reviews like this one!

Leave a Reply

%d bloggers like this: