Review: Skilhunt EK1 - a twisty keychain light with USB-C charging and an optional high-CRI LED

This Skilhunt EK1 (affiliate link) was provided by Skilhunt for review.


The Skilhunt EK1 is a keychain flashlight with USB-C charging optional high-CRI, and a two-position twist switch. It resembles the previously popular CooYoo Quantum and similar lights from other brands, but has a larger battery and modern charging. Unfortunately, the battery is not field-replaceable.

It won't be a surprise to most people who have read my articles in the past that the low-CRI SST-20 is not the LED option I would recommend here. It is extremely green and does not have an output advantage that would justify giving up the color quality.

For those who want a small keychain light, the EK1 is Conditionally Recommended with the high-CRI LED option.


Spec -
Battery 1x10220
LED SST-20, 219F
Color temperature 6329K
Color rendering index 69
Max output 162 lm
Max throw 60 m
Max sustainable output n/a
Best efficiency 122 lm/W @ 12 lm
Candela per lumen 5.6 (floody)
Length 50.5 mm
Head diameter 14.6 mm
Weight 14.8 g
Charging USB-C
Low Voltage Protection (LVP) No
Lockout No
Approximate price $19
Rating ★★★☆☆ (conditionally recommended)


  • Compliant USB-C (use any power supply)
  • Larger battery than many competitors
  • Optional high CRI


  • Battery is not field-replaceable
  • No low-voltage protection
  • No moonlight mode

Details and technical analysis


The EK1 comes in red, blue, green, and orange with a choice of low-CRI SST-20 or high-CRI 219F LEDs. This is the orange, SST-20 version.


The EK1 comes with a USB-A to USB-C cable, keyring, and spare O-rings

Modes and user interface

Mode Estimated lumens Estimated throw (FL1 meters)
Low 12 14
High 162 60

The EK1's user interface is very simple: tighten the head to turn on low; tighten more for high.

Output, runtime, and efficiency

Time to 80% Time to 50% Time to 10%
Low 12 95 minutes 6.8 hours 11.0 hours 122
High 162 7.9 minutes 24 minutes 36 minutes 109

Light quality

Readings are taken from the center spot diffused with DC Fix diffusion film using an X-rite i1Pro spectrophotometer.

Tint Duv CRI
(deep red)
(deep blue)
Low 5628K 0.0162 (2x extremely green) 68.2 -58.3 35.0
High 6329K 0.0099 (extremely green) 69.1 -45.9 39.2


EK1 vs Zebralight SC64c LE and BLF 348

Note the Zebralight SC64c LE used for reference here is a much larger and more poweful light. It's my standard reference for everything even though a comparison would be unreasonable.

Low, high, SC64c LE

Batteries and charging

The 10220 Li-ion battery is not field-replaceable. Its capacity is listed at 130 mAh. That's larger than many competitors in this segment, as the previous common battery was a 10180 with a capacity of 80 mAh. Charging is via USB-C, and C-C cables do work. It takes about 90 minutes to charge from empty.

With a bit of wiggling and tugging, the head comes off the battery compartment. Some pulling on a plastic retaining clip with tweezers allows removal of the charging pill and battery. I did not find reliable suppliers for batteries in this size with a quick web search, though there are some sellers offering them on Aliexpress.

Size and ergonomics

The EK1 is about half the length of an AAA light, allowing it to go nearly unnoticed on most keyrings.

Modification potential

Removing a pair of tiny screws inside the head grants access to the MCPCB, which also has some resistors on it to serve as the EK1's driver. Swaps to other 3V 3535 size emitters are possible, though it's more challenging to reflow than a standard MCPCB. I put a high-CRI SST-20 in mine.

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