The There Are No Stupid Questions Thread

Edit to the edit…I guess Piotr Wang is the actual company that markets the Queen Battery trademark/brand. So…who’s the real manufacturer then……mystery.

And another: The weight on the QB web page is different than what’s on the datasheet. The datasheet says 121g, which matches the Alibaba green cell’s statement. I just weighed all four of my QB 26800 cells and got: 115.75, 115.80, 115.81, 115.81.

For what that’s worth…

Looking at the specs from Piotr Wang QB they are about identical to the Shenzhen Qiyun offering. Same weight (121 ±3g), same charge / discharge rates, etc.

Shenzhen Qiyun Technology Co.

Piotr Wang Power Trading Co.

In the last pic, there is a mention of the golden coloured wrapper (above the weight).

Thanks to Correlux for the links.

Imgur compresses the images making them almost unreadable. Link in the pics.

When the OP stated “a deal” on those 26800, I was penchant to yet another hyped seller with fake cells. I’m always dubious of such claims. But after comparing the specs, they may be legit. As stated, would have to buy and test, and if someone else would chime in to cover some costs (or perhaps CollectEverything has a need for 20 units?), this may be an outlet for these batteries.

Edit:
I should give more credit to Correlux as he is more fact-checker and thorough than I.

I inquired about the shipping cost and was told $54 USD to ship an order of 10 pieces, shipping time ~13 days. That brings the total up to $80.4 before taxes or any other fees have been considered. I’d say $8 each isn’t too bad but I don’t actually need 10 of these for myself. I’m also unsure if I would have any import fees to deal with.

The ML cells can be recharged - if you try to recharge the CRs they’re likely to explode. And that’s the real meaning of primary vs secondary cells: primaries are disposable and secondaries are rechargeable.

There is also likely to be a voltage difference, which could harm things.

I exchanged a couple of emails with Aloft Hobbies about the QB 26800 cells. They don’t know who the manufacturer is, either, and their supplier isn’t talking. lol. So…may remain an eternal mystery. They are due to receive another shipment of 26800 cells in the next week or so, so that’s good news. May be worth comparing their landed/shipped cost with your source now. I’d email them to ask about shipping, though, because apparently their website software tends to go exorbitant for int’l shipments but they can do it cheaper.

How bad are we talking on that shipping? A single cell on Aliexpress costs $7-10 to ship.

Cheap for me so far. Last order was in October for two 21700 and it was $5.25. First time with 4x26800 and one 21700 it was $10.85. When I order from Illumn, Liion, or IMR it seems like it’s never less than $8-10 if any cell is involved, no matter the weight…they do accessories-only for a bit cheaper.

That said, the post office has increased prices a bit and I see that Aloft’s prices on cells have gone up recently as well…could be that shipping has followed suit, just have to plug in an order and see I guess. If it seems too high I wouldn’t hesitate to email them. Their shipping was ridiculously fast for the postal service, too, each time.

One emitters suddenly burn out of my SP36. Are the other 3 LED taking more amps?

What could be the possible reasons for a Reylight Pineapple brass not to turn on? I tried with a Li ion and a NI-MH battery. The contact should be good because the threads are brass.

Retaining rings? Make sure everything’s snug.

Hello! Not sure if this been asked or not. I’ve been seeing a lot more lately the designation R9080 or R9050 when referring to an LED. I understand high CRI but I’m guessing it’s something more specific than that. Can someone please explain to me what those numbers mean exactly?

Nichia’s designation. The first set refers to Ra (R average of R1 to R8 – broad spectrum), the second set to R9 (the redshift).

So both are CRI90 but one have more red reproduction? Is that it?

The 2nd one, R9050, has less red representation. Without the rest of the analytics, I would infer a greener tint. But the overall balance is in the 90% colour rendering. It could have also more yellow or another artifact. Generally, Nichia’s are known for their good emitters. It’s white wall hunting and side by side comparisons that demark the small differences. With time, your eye can see these individually.

Yes, both 90 CRI

@story, the answer is yes, as the battery packs will still be pushing about the same amount of power, which means current pushed to each LEd will go up a bit.

Ah ok! I get it now. Thanks!!

Thanks.

I have TrustFire TR-3T6, can I reflow 3 SFT-40 to replace the CREE XM-L2?

Would add that although 9050 and 9080 are both rated 90CRI, the 9080 is closer to 95+ CRI in practice. Some higher CCT 519A's (rated 9080) measure above 97; even seen one measure 100.0 on an Opple meter.

That should be possible. The XM-L2 is a current sensitive led just like the SFT40 so most likely the current of the flashlight will be somehow limited. You should use copper DTP MCPCBs, though.