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    WTB: F04 1.0" Surefire Diffuser, qty: 2 if possible

    I am looking to purchase 2 of these. E-mail for fastest response: [email protected]
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    what wattage solar cell do i need?

    I have no affiliation other than as a customer. I have not used this product personally. https://www.clouddefensive.com/product/easyacc-24000mah-solar-power-battery-pack-and-nitecore-ui2-charger/
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    if i lose power how many months will my 18650s stay charged to 80%

    It's dark 50% of the time plus or minus, so batteries matter here, too. My PVS14 is powered by batteries. My MAWL. My WML. It's all battery powered. Heck, even my NX8 has a battery, although it can work without one of course.
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    Best 18350 battery...and caveats...

    As I understand it, the best 18350 unprotected cell on the market currently is the Keeppower. Is this correct? The usage is a fairly hot flashlight, 1500 lumen range. What bothers me is that I've read all 18350s are rewraps from China. Basically second rate stuff randomly marketed by 2nd party...
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    if i lose power how many months will my 18650s stay charged to 80%

    Just this year I completed my 15 year study/test. TL/DR: 18650s will outlast the devices relevance that you have them in. I can literally think of nothing 15 years old that isnt, as an item, performing at the bottom 15% of the pack by now, that takes an 18650.
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    "A" "B" and "C" grade cells?

    How do you know what you're getting? I bought these Sanyo NCR 18650GA from Orbtronic. Does this "B" mean they are "B" Grade cells? If so, who can I trust not to sell me junk cells without disclosing it first? If not, what does the "B" mean?
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    Best 18650 battery (with criteria)

    I bought from Illumn, and Orbtronic. I did not use price as a matrix, but rather, reviews and site layout. If words were misspelled often and the layout looked "cheap", and reviews were lacking, I avoided it. I did notice the Sanyo batteries from Japan always reviewed and tested higher...
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    Best 18650 battery (with criteria)

    Subjectively, with a bit of objectivity. I calculated run-time based on OEM mah rating of the batteries, and they more or less matched the calculations in my Streamlight HLX handheld 1000lm light. This is after 15 years, countless cycles, and being "run into the ground" where they wouldn't even...
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    Best 18650 battery (with criteria)

    Quick Question, where is the LG Chem MJ1 manufactured? I thought Korea only, but on batteryjunction, it says "CN". Is there 2 factories? How can I tell which battery I have?
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    Best 18650 battery (with criteria)

    I had a question about that. This is the testing I've done so far, and if you require a summary of it: Old laptop pack, 15 years or so, heavily used, sat un-used for almost 10 years, then I tore it open and began using the cells and they are excellent. Good as new.
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    Best 18650 battery (with criteria)

    100% agreed, but it is an 18650 battery we are talking about. Within reason, price isn't a concern for 3-4 items. The reason I am not all on board with the LFP chemistry is because I see they begin at 3.6V, and discharge down to 2.5V. They only hold about 1200mah. I am presuming this is linear...
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    Best 18650 battery (with criteria)

    Mainly LFP is a turnoff due to the low voltage. Below 3.0v, the light wont function.
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    Best 18650 battery (with criteria)

    https://uwspace.uwaterloo.ca/bitstream/handle/10012/12177/Catton_John.pdf?sequence=3&isAllowed=y file:///D:/Downloads/energies-11-03295.pdf Given the massive capacity difference, I am inclined to go with non LFP cells, as even the slight increase in degradation will still put me far ahead in a...
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    Best 18650 battery (with criteria)

    Yes, 18650 or 18350 are the only two options. Why would a company lie about their product much to their detriment in their data sheets?
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    Best 18650 battery (with criteria)

    This is for a weapon mounted light. https://modlite.com/collections/weapon-mounted-lights/products/modlite-okw-18650-light-package?variant=20414940479547 I intend to feed it the most reliable food possible. I could sacrifice the runtime, but at 3% loss per month, it does not appear that the LFP...
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    Best 18650 battery (with criteria)

    Its ability to retain charge in storage/not being used does not exceed other much higher mah capacity batteries. 50% is only 5-600mah, while a 3500/2=more than the LFP starts with fresh and full.
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    Best 18650 battery (with criteria)

    I have looked up as much data as I can find, and the discharge data for this chemistry doesn't show to be special at all. https://www.batteryspace.com/prod-specs/9444.pdf
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    Best 18650 battery (with criteria)

    These? https://www.18650batterystore.com/Lithium-Werks-p/lithiumwerks-apr18650m1b.htm?gclid=Cj0KCQjw7Nj5BRCZARIsABwxDKLL-R_VuX7-1DVS4V326aK99iihbA31XMQMrOerDYkZCJnNiamDnIEaAlp0EALw_wcB Do you have any data on your claims? I am not doubting, just looking for quantification, and figure you know...
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    Best 18650 battery (with criteria)

    I have been reading that if I cut off charge voltage at 4.1V, I will have 90% capacity, but will drastically lengthen service life of the battery? Does this mean a 3300mah battery would perform equal to a 3000mah battery with a full charge, if charged to 4.1V? If this is true, should I FULLY...
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