It is trying to predict battery life based on calculations of voltage and load. This is very hard to do with accuracy. You can not expect good accuracy for predictions.
This stuff is very specific to the PB2. It has it’s circuitry designed a certain way. You’d need to ask the Xtar people these specific questions.
Hard to say exactly what the efficiency is, but I would not think it’s in the single digits of efficiency, but I really don’t know. Since the PB2 can output 5v from a single 4.2 volt battery it has to have a boost driver of some sort. Boost drivers do produce a loss in efficiency. I’m trying to decipher HKJ’s review and it looks like on battery power alone the efficiency starts at 90% and slowly drops to 85%. This sounds about right to me.
Also, remember that most batteries are rated for capacity by measuring all the way down to like 2.8 volt or less. The PB2 powerbank only puts out 5v from battery only until it’s batteries are down to 3.2 volt. So if you are using two 2000mah batteries you will not get the full 4000mah out of them (assuming they are wired in series, maybe not, but you basically can think of it as 4000mah). How much capacity you actually get will be based on the discharge curve of the particular batteries you are using. Some drop like a rock after 3.2v and some keep going a long time after 3.2v. I would probably use the newest, best high capacity cells I could, like Samsung 35E or equivalent in order to get the most out of the powerbank.
Sorry I can’t answer too exactly, but hopefully it helps a little.
In the case of lights with different emitters, because they perform very differently but the owners probably like all the other aspects of those lights.
Other people get them in different colors, metals, etc. which I don’t get but that kind of “collector” mindset is common for lots of hobbies.
Don’t want to think of all the possibilities, which LED will the SF11
Take.
It’s a simple matter of desoldering the two leads, and resoldering the new
On once one get the proper LED. The person used two Phillip screws to anchor the Led plate.
The two screws are a bit lopsided. A hack job, I guess….
And the LED became detached….
Would appreciate the part #, if someone is in the know.
Mass is Massachusetts, USA? I would order from MTN. The SF11 comes with an XPL stock. You can choose your color, CW, NW, etc… You just need to find the diameter, like 16mm, 22mm, etc…
The screws are probably factory, they are there to keep the MCPCB from rotating.
While its entirely possible , likely even that other life exists out there, it is also equally possible we really are the only ones , so not naive sadly
I disagree. Once people understand just how vast space is, our nearest star is like 4 something light years away, and you factor in that Earth has only been transmitting signals about 100 years, you realize those signals have only reached a handful of nearby stars. I’m pretty sure life is out there, but they not only need to be within this super short distance to even know we exist, but also in this tiny sweet spot of time in their civilization where they are intelligent, but not nuked themselves back to the stone age yet. This might be a few 100 years within hundreds of millions of years. So if this super rare synchronization happens, they still need to have faster than light travel just to get here. So the odds of any two civilizations actually meeting are much, much lower than there being multiple civilizations out there. More than likely we would be the aliens finding “life” out there in the form of bacteria or maybe animals.
To sum it up, odds are quite good for life out there. There could be millions of planets with life and some of which are complex and maybe intelligent.
The odds of us or any of them coming into contact, almost non existant. The distances are just too far.
Star Trek is cool in that it looks like we could find other groups, but the reality is that even at just under Warp 10, about 6000 times the speed of light, the Enterprise would take years to travel the super long distances, even decades or centuries. This would not make good television, so they have to shorten the distances and times dramatically. We can’t even travel within a fraction of Warp 1, speed of light, much less many times faster. Practically speaking, we’d need to go much, much faster than these Warp drives. Space is seriously way bigger than we can wrap our heads around. (All my opinion)
While I am fully familiar with the drake equation and the Fermi paradox , the fact remains it’s only a theory to make an assumption without evidence and draw a conclusion is not scientific, it is equally possible we are such an extreme fluke we are the only ones in the entire universe , sadly neither theory is proven , there is no right or wrong answer here we simply have to acknowledge both possibilities and remain neutral until evidence exists.