Recent content by Ray_of_Light

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  1. Ray_of_Light

    Incoming - What do you have coming in the mail??

    I have no use for most of my flashlights. I just like what they do, and how they are engineered. That's being a flashaholic pure and simple...
  2. Ray_of_Light

    Brightest Spotlight?

    I bought one Acebeam X75 few days ago. This light is different from other flashlights in this class because it is designed by someone who knows physics. The light is made of three modules connected tighter: the light engine, with the 12 LED installed on an exposed heat block; the frame, with a...
  3. Ray_of_Light

    Incoming - What do you have coming in the mail??

    It arrived few days ago. Anthony
  4. Ray_of_Light

    What is your overall experience with Nitecore products?

    I have more than a dozen of 2022 to 2024 Nitecore flashlights. None has given up on me. Of all Chinese manufacturers, Nitecore is the one which iterates faster and, for some of their models, they introduce a new version every year. Sometime thought, just like with Apple iPhones, the new model...
  5. Ray_of_Light

    Oldest LED lights you own

    The oldest on hand... Greetings, Anthony
  6. IMG_20240314_203004.jpg

    IMG_20240314_203004.jpg

    • Ray_of_Light
    • Media item
    • Comments: 0
    • Category: LED Flashlights
  7. Ray_of_Light

    I came on board here in 2003

    I've seen your post almost by chance... and I felt compelled to jump in and say "hi!". I joined CPF in the halcyon days of the flashlight (torch) hobby, when it took days of my time just to sort out a Luxeon mod. Still have an hundred or two of lights around, but the time spent on them is now...
  8. Ray_of_Light

    Why do lithium batts last 2 times longer in one device, but 5-10 longer in another?

    The answer lye in the very different Current_draw vs Capacity curve of alkaline and LiFeS2 batteries. A typical AA alkaline delivers 2 Ah at 20 mA current draw, and only 0.5 Ah at 2 Amp. A typical LiFeS2 AA will deliver its capacity of 3 Ah at 20 mA - and only slightly less at 2 Amps...
  9. Ray_of_Light

    Charging lithium ion cell with CV only (4.1V), using a voltage regulator

    The correct charging protocol for LiCoO2 batteries is CC-CV-stop at 0.01 C or less. This means that you can use a current limited voltage stabilised power supply to charge a standard Li-Ion, but you must remove the voltage after the battery reach 4.2 V. You remove the voltage when the idle...
  10. Ray_of_Light

    The future of Batteries

    When I started this thread, my intention was (and still is) to present a sizable amount of information to give all peers here an informed idea of how the research and the market of batteries may progress in the future. The accomplishment of environmental targets is one of the important...
  11. Ray_of_Light

    The future of Batteries

    Manganese is used to stiffen the zinc can of heavy-duty, zinc carbon batteries. In inside-out construction, like alkaline batteries are, there is no need to stiffen the powder. My bad. In the world of batteries, "Mercury-Free" (or, more honestly, "No-Mercury-Added") is about 250 ppm. You can...
  12. Ray_of_Light

    12V AGM/GEL have a break-in period?

    Usually the jump starters uses a standard 12 V 18 Ah AGM battery. When the battery is stored for more than six months after the production date, it starts to develop hard sulfation. After one year, it may become unrecoverable. To recover from six months of hard sulfation, it necessary to leave...
  13. Ray_of_Light

    The future of Batteries

    Carbon lead acid batteries can handle 500 cycles at 80% DOD, compared to the 200 standard cycles. Their most important feature is the fact that can stand partially-charged for very long time without losing capacity, which is not true for standard lead acid batteries. They are particularly...
  14. Ray_of_Light

    Optimizing the life of lead-acid batteries

    1. Buy or build a desulfator of the right size for your battery capacity. Actually you can only buy desulfators for 12 V batteries. 2. Connect it to the sulfated battery. 3. After a week, if no other failures are present, the battery will be able to accept charge from a standard charger...
  15. Ray_of_Light

    Optimizing the life of lead-acid batteries

    The VRLA batteries are subject to three principal failure modes. Any early failure is technically named PCL (Premature Capacity Loss). The PCL-1 mode is caused from developing a passivation layer between the positive grid and the active material deposed on it. This has been solved by adding tin...
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