OF, I hear you, I really do. We DID discuss this problem.
However, this is an aspect of the Volta that can easily be improved in the future, and we intend to do so. Can you offer us some suggestions about what we can do here?
What color combination would be best?
Thanks. It's encouraging that this will eventually be addressed, too bad that couldn't have been sorted out before (even if in a parallel effort) as multiple versions are not desirable? I'm fully aware of the Vf issue and would point out it's easier to drive yellow than green? Lower energy and all.
There are I think a lot of options, but not being able to see the unit (nor ironically likely to see it before this issue is sorted out.....) I'm somewhat at a loss. For openers, given the choice I'd have dumped the green 'everything is fine, just wait' light in favor of the 'don't do this, you'll trash the battery' one. Red is mission critical if you want to save the battery, green is a nice selling feature. Many useful vapes have no light at all. By the numbers you post, 8 minutes of run time to the 95% drop dead point, the red light time is less than half a minute (24 seconds on the back of this envelope). This would allow me one misread, maybe two (at your 10 to 20 seconds per) before needing replacement? This assumes it turned some time in the prior hit.
Depending on the voltage detector used, flashing the indicator is a option. IIRC it's a diode and resistor deal?
Sticking with the dual color idea a second window (or modification of the existing one) with a filter would allow folks like me to sort it out. In the case of Puffit they used two SMD LEDS to illuminate the tube you hit through. I was able to drill a small hole above one (green I think) for a window and block light from the other. The two different states need to appear different somehow. A second window (it could be small) with say a red filter would be dark until 'lo batt'. Or the other way around. Depending on the design the current window could include the filter over part of changing it from a cross to a dot say?
As a color blind guy I have no useful advice WRT colors for the most part. I can say red/green is the
worst choice. By a wide margin most are red/green color blind, like I am. Some are hopeless WRT any color you pick, really, but they are a tiny fraction. A filter or 'two window' solution would work for them of course. Mine is typical, a few percent of the total population as I understand it? Personally most yellows are not a problem but that's not hard and fast.....but an improvement over red/green?
Ironically there are some greens many of us find easier to pick out ('sea green' for instance, although Vf is bigger there too IIRC, sort of blue, but more), but the usual green is coltrolled by quantum mechanics, not aesthetics.
Thanks again, and again my best wishes with what seems like a neat little gadget. I'll watch to see how it plays out. I'm guessing it'll end up being pretty hard on batteries anyway, you don't need me (color) blindly sending them to an early grave. Sorry, couldn't pass the pun.
OF