Your forgetting that the E07 pulls about 20A while your C8F and PL47 pull about 10A, roughly. I got the same results as you.
What RobertB is saying is that at the higher amp draws (the 20A range), the Sofirn 4000mah seems to be having difficulty while the 30Q keeps pulling strong. It seems strange to me, but I suppose it’s possible.
Some scientific testing of the Sofirn 4000mah is needed.
Just like Tepco got warned that the tsunami barriers at Fukushima where subpar and not high enough and there a fairly high chance i think it was a 20% chance of 30+ foot wave hitting Fukushima. Low and behold look at it now. Cited twice on two different occasion from different reports and urged to be prepared but money wins all the time.
Now look the clean up cost plus lose of lives and lively hoods ruined.
It looks like many chineese battery sellers or budled batteries are in the last months replacing original SDI or Sony cells with some doubtful cheap cells with just a lot worse internal resistance
and Liitokala and other Aliexpress selllers are even faking the original labels and sell for the same price as original cells
I doubt this will pay out in the long run, they simply gamble with their reputation and will loose over time
I’ve ordered from Sofirn a number of times by now. I cannot order bare batteries from them (bare batteries not allowed to be shipped to my country), so the Sofirn batteries are always ordered only with the Sofirn flashlights.
I have had several Sofirn 18650s by now. The earliest one was the red one (looks like “UltraFire” wrapping), followed by the black wrapper — the black wrapped Sofirn seems to be the current wrapper for the 18650s, and indicates 3000mAh (I’ve ordered a lower Sofirn flashlight model which came with 2200mAh 18650 though, but that is another subject…)
(these are only about the capacity test, didn’t do much IR testing, but )
Sofirn “3000mAh” 18650 (red wrapper, and black wrapper)
-The earliest Sofirn 3000mAh 18650 (red wrapper, or the black wrapper — these 18650s are likely 6 or more months ago) — when I first tested their capacity with my MC3000 (–0.50A discharge to 2.50v), I only got around 2700+ mAh for all of them. (so these are actually a bit lower than their 3000mAh label)
-But the newer Sofirn 3000mAh 18650 (same black wrapping) from more recent order (around 2 months or so ago) — testing their capacity, I’m consistently getting 3000+ mAh capacity (same –0.50A discharge to 2.50v). (they are now correctly labeled)
Sofirn “2800mAh” blue/black-wrapping protected 18650
-The blue/black-wrapped Sofirn 2800mAh protected 18650 are protected batteries, which trip at around 6 amps.
I only got a few of these (I think they were all from around 6 or so months ago) - their tested capacity were 2700-2800mAh, so they are “correctly” labeled.
Sofirn 900mAh 14500:
- now these seem to have several batches too.
- as mentioned above, some of them (the earlier models, as in 6 months or so ago) are quite short in physical length — they are a bit shorter than Eneloop AA NiMh batteries.
- tested capacity are between 800-900mah
the newer batch appears to be a bit longer now (similar size to other common unprotected 14500s, not “a bit shorter” anymore), tested capacity seems to still be around 800-900mAh
Been a few months. Any more data on the Sofirn 5000/5500 26650? I would imagine a lot of BLFers have a few now. Max amp draw? Don’t see a HKJ test yet.
Not when it comes down to getting it bundled with a flashlight for so cheap. This is convenient for the countries that can’t get cells shipped by themselves.
To import 100pcs of 18680’s into New Zealand shipping alone costs $120+ USD, whereas it’s free shipping when in a flashlight. Even 10pcs costs $30 USD
I’ll upload my graph tomorrow.
Sofirn 26650 High Drain is only a 15A cell for max continuous discharge current. 20A was far too high. It could be that the added button top is increasing resistance thus causing higher voltage drop than without it
Very expensive shipping to New Zealand via USPS is the only option available right now. There was a cheaper option until some idiot tried to import a gun.
As you can see on the below graph that 20A is too high