The only way to really tell — Test the Lumen output and check the amperage — Higher amperage doesn’t always translate to more Lumens ---- Also I have Tesla Model 3 cells that outperform 40Ts and the Molicel P42A when the cells get below 3.9 volts ---- Crazy stuff
Different cells hold their energy at different voltage ranges also – The Teslas are almost empty by 3.3 volts
Important to buy what you like – next time you do a discharge test – make notes of where the voltage is at certain capacities ( 500 mah 1000mah and so forth ) might give you some perspective on your cells
It’s illegal to ship batteries by themselves by USPS first class or priority mail.
If you buy USPS from us, we are shipping it with a flashlight or fan or other battery powered item, under the rules for shipping a device with accompanying batteries (for USPS it’s 8 cells or less per device). It’s part of why our shipping costs are slightly higher than normal USPS rates, to help cover part of the device. And it’s part of why some less used sizes like 26650 or 10440 you don’t get USPS options from us, since we can’t find a reasonable cost compatible device to ship with them.
Yes people and companies ship it illegally all the time, nobody at USPS is opening these packages and checking, and most postal workers don’t even know the rules. But it’s dangerous to have undeclared batteries in passenger planes. And if you were ever actually caught shipping batteries alone, it’s potentially hundreds of thousands of dollars fine per occurrence.
That’s for domestic. As for internationally, as I mentioned it’s completely illegal no matter how we do it which is why we have UPS only.
You can reference the table at the bottom. Lithium ion batteries without equipment, by air transportation are prohibited. First class and Priority are air transportation.
At the root of it, as usual, is a problem with air shipment quality control. IF said individual cells were handled safely in the hold of an airplane they would be zero danger, or virtually so. The incidents of cells starting fires aboard planes have been due to crushing shifts in the cargo hold, not a problem with cells but a problem with cells being destroyed by the carrier en-route.
Nonetheless, I have a LOT of li-ion cells, well over 300. And virtually all arrived in my mailbox. Many from Liionwholesale. I guess that will have to change, someone else will be happy to take my orders.
I appreciate your past business, but now I’m confused. Are you saying you’re going to stop doing business with Liion Wholesale because I referenced the shipping rules to you? I thought I was helping, since you seemed to genuinely be unaware. Maybe I miscommunicated something.
These rules were put into place in 2019 I think, maybe even 2018. It was a long time ago. Nothing has changed. If you’ve bought from us in the past 4 or 5 years, it should be exactly the same now as it was then. Again we still ship via USPS domestically for most battery types, including 21700 which is what this thread was about.
10 minutes of incremental Max output. With 4 minutes rest in between and using a fan to cool off.
This is a modified search light using high drain batteries. I use it on max output. It’s not a EDC light where you conserve the battery life to get as much useful light out of it.Plumber,Electrician ect.
The scenario you suggested, the 50S would most likely be first because it has the most mAh, then the P45B and last would be P42A.
I do not doubt mooch’s test. I’m sure this is a good battery. It just surprised me, I was expecting it to have better results than the other two batteries.
I can not find Tom E’s notes for my K1. But I am positive it pushed well over 20 amps. I’m going to keep looking for that information.
My expectations were based on what mooch said in his Review…SEE Screenshot of graph… where he says the P45B runs Longer than the P42A at All current discharge levels .
Also The P45B runs Longer at about 15A or higher than the Samsung 50S.
My results seem to contradict that.
Then again, those stats could be based on how it’s used in a vape mechanism, not a flashlight?Because there’s a huge difference. You’re not getting any good output with a flashlight when it’s like 3.4 volts. You still can get hits off your Vape at that voltage.I do not vape…that is what I was told and what I saw( still useful @3.4v,3.3v).on his graphs.
Using an unregulated light on turbo to compare battery capacity/performance is just a bad way to test, unless you were monitoring/tracking voltage and current during the test. Also, using battery voltage as a measure of used/remaining capacity is also not correct (it’ll give you a rough idea but you can’t really compare between batteries).
Maybe leave it up to the pros to do battery tests (Mooch, etc.)
You’re proving the well-known fact that pushing more lumens (P45B) will drain a battery faster and result in less runtime. Seems pretty obvious that using a lower drain (amps) and higher capacity battery (50S) will result in a longer runtime in an unregulated light. If that’s how you like to use a light that’s totally fine. However, useless for comparing batteries (P42A vs. P45B).
FYI, THE 18650 battery store just sent out an email stating they have the P45B on sale for 7.50 each. Of course I already ordered mine for 10 bucks each.
The light is not regulated right? So the lower the voltage goes, the lower the light output?
The thing about the P45B is that it will have significantly less voltage sag than the others, so the voltage in use will be higher. That means the light will be brighter for P45B than it is for the others. Which means the test is unfair, the P45B is putting out more current than the others.
The other thing is that the P45B should be able to run at a lower voltage than the others, while still giving you the same light output. How much lower depends on how much current it is. If it’s really 20A or so, then if you try the P45B at 3.3V or maybe even 3.25V the light output should be equal to the 50S at 3.4V. So setting an arbitrary limit of 3.4V is also not fair to the P45B.
If for you, you don’t care how bright the light is, and stop operation at 3.4V no matter what (or just run for a set amount of time then measure voltage), then yeah it wouldn’t surprise me if the P45B is worse than the others. That’s valid but it’s important to be aware of the test’s limitations for other people who might not be the same.
Depends on the driver. A light with a boost driver should easily output at max level until the voltage sags enough to cause the driver to step down the brightness.
Your generalized statement only applies to linear or buck drivers (and also depends on lots of variables: the LED Vf at the given output, etc.)
Just did a bench test: S2+ 519A (has low Vf) still draws 4.5A at 3.4V whereas at 4.2V it’s 5.4A, so 83% output.
I should have been more specific good is a matter of preference and opinion.
When I say good I mean high output. In other words I don’t care what kind of driver it is you’re not going to sustain Max output when you’re at 3.4 volts. It’s just not happening. That’s just my preference ,High output.
Both myself and my buddy trend towards what Cochise334ever does, max output until a cell swap is needed. We use the cells that give us the most lumens, and when the lumens drop below our needs the next cell is drained. For us that has been mostly 40T’s. We’ll have to see more use but so far I don’t see the Molicel ousting our 40T’s.
But of course I know Liionwholesale ships cells via USPS. As do other places. No big deal, there’s basically three places I’ll get my cells, based on IF they have what I need at the time and IF the price is right. Pretty basic stuff.
I don’t worry much about what anyone else is saying or doing, I know my needs and a few friends so we do what we do.
Just curious, aren’t we talking about the P45B in this thread and not the P42A?
Also, I see the numbers in your screen shot for the 40T AFTER mods, but nothing about the the 42A after mods??
Have you measured your light, or are you going by somebody else’ numbers?
Just trying to tie this in with the thread topic, and see how you got the numbers.
I don’t have a dog in the race. I don’t yet have any P45B cells. I do have some 40Ts and P42A cells. Honestly, other than demos to impress the buddies, I use the P42A cells more often because I get longer run time at the levels that I use everyday. I am interested in deciding whether it is worth buying some of the P45B cells for that purpose. I have easily 100 21700 cells now. It is not like I really NEED more.
