Recent content by roostre

fenix-store
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    Aacycler gone?

    Unfortunately "http://aacycler.com/" is no longer functioning for me either. Even though it had not been updated for a few years, it was a great resource with helpful information comparing the life and capacity for various brands of NiMH cells.
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    What LED Flashlights Have An SOS Mode?

    Searching for "flashlight sos rescue" within Google's "News" category yields: https://wpde.com/news/local/missing-divers-rescued-off-north-carolina-coast-thanks-to-sos-strobe-light-detected-by-c130-myrtle-beach-horry-county-coast-guard...
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    Portable Powerbank

    I probably would not be able to provide any helpful information concerning the included batteries, but regarding the low voltage protection cutoff, my concern was if when using the charger as a power bank with un-protected battery cells in the charger, if it would stop charging an external...
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    Portable Powerbank

    The following quote is from the Amazon five-star review for this charger from "Richie in the United States on November 18, 2023": '... Being that the batteries are not only easily replaceable, they are wired in "parallel" so they all remain at the exact same voltage, whether recharging or while...
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    Discharge Rate for Cycling AA / AAA Batteries

    I only cycle (charge then discharge to test capacity and then a final charge) Li-ion batteries once when I wish to test their capacity (I do not try to "refresh" them with multiple cycling). It is only for NiMH batteries that I occasionally cycle multiple times (up to three and then a final...
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    Discharge Rate for Cycling AA / AAA Batteries

    The manuals for most "Analyzing Chargers" provide helpful recommendations. Check out the "General Battery Education" section in the "Powerex MH-C9000PRO" analyzing charger manual (which only charges NiMH batteries)...
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    Discharge Rate for Cycling AA / AAA Batteries

    I assumed that you were cycling NiMH batteries to refresh them, but maybe I misunderstood your original question, so here is some clarifying information. Typically the "mA charge rate" for AA and AAA NiMH batteries is recommended to be at least "0.3 times the mAh capacity of the cell" (to help...
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    Discharge Rate for Cycling AA / AAA Batteries

    The "AA Cycler" website ( http://aacycler.com/ ) compares various brands of NiMH batteries. The charge and discharge rates they use for testing are listed at http://aacycler.com/about/how/ : For AA sized NiMH cells, they use a 1000 mA charge rate and a 500 mA discharge rate. For AAA sized...
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    Signaling with a Flashlight from 18 Miles Away

    Using division followed by multiplication to ratio and calculate a height of "42 feet" would not be correct since this is not a linear relationship. How far away is the horizon: https://sites.math.washington.edu/~conroy/m120-general/horizon.pdf You would need to know both the distance between...
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    Fraz Labs Mechanical Flashlights (formerly QTC Non-Battery Crush)

    Thanks for relating your experiences and addressing my concerns. The electronic-free QTC technology is intriguing and the durability Fraz Lab lights have against damage from extreme drops is most impressive. I am still concerned about obtaining replacement QTC in the future (depending on how...
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    Fraz Labs Mechanical Flashlights (formerly QTC Non-Battery Crush)

    Can any forum members provide advice concerning: 1) Does the QTC last forever (~10 years to outlast me) or will it eventually need to be replaced? 2) Are there any guidelines or experiences for how long (time wise) the "like new functionality" of the QTC will last before it is adversely...
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    Single Lithium Ion Rechargeable (18650/16650 etc.) vs. 2+Primary Cells (CR123 for example) Safety Margin Question

    The below article includes recommendations for avoiding potential issues: https://photonphreaks.com/exploding-flashlights-and-how-to-prevent-it/
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    Power bank that can be charged with apple "lightning" cord recommendation

    Three years ago (when they where frequently offered as "Amazon Lightning Deals") I purchased two of these power banks that include both a micro-USB input port and an Apple Lightning input port for charging the power bank (but only one of these power banks is still functioning unfortunately)...
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    Battery Storage Case

    My most used AA / AAA cases are the ones from Panasonic which each hold either 4 x AA or 5 x AAA batteries. They cost a little more than similar types and are not waterproof, but they are of higher quality than the other types I have used: https://www.amazon.com/dp/B00JHKSKZQ/?tag=cpf0b6-20...
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    Does anyone have any credible information on the safety of Olights?

    This article explains (including diagrams) the issues and dangers when using lithium-based batteries in series and specifically references the Caleb Joyner incident and the particular Olight involved in that incident: https://photonphreaks.com/exploding-flashlights-and-how-to-prevent-it/
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