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I have tested UT03 with a few setups:

1. Protected Panasonic NCR18650B (translucent insulator) 18650 - 69.8mm
2. Protected Panasonic NCR18650B (black insulator) 18650 - 68.7mm
3. IMALENT 2600mAh protected 18650 - 68.4mm
4. Sanyo NCR18650GA unprotected 18650 - 65.2mm
5. Samsung 30Q unprotected 18650 - 64.9mm

From my observation, protected Panasonic NCR18650B (1) is able to make much better contact among all the tested batteries. Tailcap can be tighten without extra effort.

17.4V is already beyond the recommended working voltage but i will find out for you. All output level related questions will be answered once production grade sample is ready.

@Stereodude

Didn’t get an answer. Anyone knows if the light would take 17.4V without issues? Also, would Beacon and SOS be at 8000+lumens, like Strobe?

Current UT03 does accept both protected and unprotected 18650s. However, the connection is far from perfect for unprotected 18650.

@JasonWW

Since this light uses brass buttons on the positive end, regular old flat tops will make contact just fine. The battery tube does not screw on like the Q8 where the positive terminal needs to be higher than the rest of the cell.

I can't deny that there is possibility. These guys are getting much better now. Delivering a substandard light will only hurt their branding in the flashlight trade. I do have fate in them after UT01 and UT02 success.

@hIKARInoob

… but I can imagine the manufacturer has the freedom to change little details without GearBest (or you) knowing them. I can imagine a theoretical possibility that the actual production UT03 is not going to like button top GAs, but prefer flattop GAs; maybe button top GAs will be uncomfortably tight. It would be horrible if button top GAs are shipped (and financial aspects taken care of) before finding out they don’t fit well… Just a thought. :laughing: