A few weeks ago i bought this little Ultratac K18 in stainless steel on E-Bay, and yesterday it arrived neatly packaged in thick bubble wrap.
It's an AAA flashlight, that is also factory rated for use with 3,7 Volt lithium-ion 10440 batteries.
I ordered mine complete with a micro-USB charger & one unprotected Trustfire 10440 battery.
A few protected 10440's are still on their way.
Besides my old Fenix LD01 (which stopped working after almost 10 years of service):
Micro-USB charger (only for charging a 10440 battery):
Tested the light a bit last night, and everything seems to work as it should.
Only had to put a drop of Nano-Oil on the threads & O-ring as these were bone dry.
Considering the small size of the light the output on high is almost unbelievable, but it also gets quite hot in a few minutes.
A few night time beam shots follow later.