Attn Foursevens Quark experts. Re QB2A

Overclocker · Jan 20, 2014

just a quick question. i just tried running the QB2A head with a 14500 and it lost moonlight.

is this normal for the QB2A? it works perfectly as expected with 2 AA

schizeckinosy · Jan 20, 2014

It should keep moonlight with a 14500

Etsu · Jan 20, 2014

Just to make sure... you're running it on a single 14500 lego'ed with a single AA body tube.... right? Yeah, it should work.

SCEMan · Jan 20, 2014

Mine has moonlight with a 14500 at 4.2v.

BillSWPA · Jan 20, 2014

In my correspondence with FourSevens customer service, they indicated that alkaline, NiMH, and 1.5 volt lithium primaries should work in their AA and AAA sized lights, but discouraged Li-Ion in these lights.

I just checked the voltage ranges of the AA Quarks on the FourSevens website, and agree with comments above that one 14500 should be okay, but do not use two 14500's.

Etsu · Jan 20, 2014

Assuming he's using a single 14500, maybe he'll get moonlight mode back when the battery isn't fully charged, and is running closer to 3.7v.

Jash · Jan 20, 2014

All my Quark heads work fine with li-ion charged to 4.2v. This is their main advantage over Fenix lights of the same size.

jabe1 · Jan 20, 2014

I have four low voltage Quark heads, and all of them retain moon mode with a 14500.

reppans · Jan 20, 2014

BillSWPA said:
In my correspondence with FourSevens customer service, they indicated that alkaline, NiMH, and 1.5 volt lithium primaries should work in their AA and AAA sized lights, but discouraged Li-Ion in these lights..

I think that's a company line so people don't continuously use max causing long-term heat issues.... that they'll eventually have to repair. I think low voltage heads Quarks actually prefer 3V+... mine seem to "whine" a bit on ~1.5v

. As a low lumen junkie, I only use max for seconds at a time, but I like using 14500s since a quick voltage check give me accurate remaining capacity.

Overclocker · Jan 21, 2014

thanks everyone

yes i'm using a single li-ion

all my quarks do maintain moonlight on all supported voltages. it's just this QB2A that doesn't. i guess it's defective...

schizeckinosy · Jan 21, 2014

When you say it lost moonlight, does it skip the mode, does it not light at all, or is it brighter than expected? I'm curious as to the failure mode.

RobertMM · Jan 21, 2014

Probably acting like Fenix heads where a new primary battery's higher initial voltage kicks up the lowest level so i can't see a difference between it and the next level. My QTA works fine with any battery type, moon is the same for NiMH and 14500.

schizeckinosy · Jan 21, 2014

I just went and checked my qb2a, and yes, the moonlight still works fine on 14500. I have modded mine to neutral XPE2, but that should not make any difference!

Overclocker · Jan 22, 2014

schizeckinosy said:
When you say it lost moonlight, does it skip the mode, does it not light at all, or is it brighter than expected? I'm curious as to the failure mode.

Level 1 becomes the same as Level 2

Level 3 becomes the same as Level 4

So i get only 3 different levels

Etsu · Jan 22, 2014

That sounds screwed up. Try it with a different 14500 battery just to make sure it's the light. Then, if running on a 14500 is important to you, send it back for a warranty repair/replacement. I've never heard 4sevens state that their low-voltage lights don't run properly on a 14500, in fact, quite the opposite.

Attn Foursevens Quark experts. Re QB2A

Overclocker

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