Recent content by HenryE

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  1. HenryE

    Digital battery meter on your flashlight?

    Almost exactly two years ago I invented a BATTERY RUNTIME METER, which counts down from some user-preset number of minutes while the flashlight is ON. When the light is OFF the countdown stops, and one can glance at the always-on display (like a digital watch) to see how many minutes remain on...
  2. HenryE

    Sold/Expired SOLD:Two modified Cree lights ***18650 or 3aaa's***

    Re: FS:Two modified Cree lights ***18650 or 3aaa's*** The one I got from you was among your first. I use the 18650 and get enormous runtime. It's become my dogwalker, with the throw of a TL3 but like a white laser, for spotting the skunks, possums, and coyotes across the fields. Probably the...
  3. HenryE

    Coleman Micropacker Lantern

    I've had that light for some time. It comes apart easily, using only a screwdriver (no snapping or popping). That exposes an acrylic tube around a "ladder" of two conductors bridged by two common LEDs. I swapped in a Nichia and now the brightness is far better. I also added a port to permit...
  4. HenryE

    DIY 500 lumens headlamp!

    I think this just needs to be built... or some version thereof. Great idea.
  5. HenryE

    Sold/Expired Interest Feeler: 18650 CREE TWISTIE

    I like this a lot! I've never had much use for tritium indicators, fancy machining - that just adds cost unnecessarily. I'd even prefer natural Al, without hard anodizing. To me, it should be a tube with some knurling and an exit hole for the light. The combination of 18650+Cree+FluPIC should be...
  6. HenryE

    Nitroz' Cree in a 3AAA (now 18650) light - terrific!

    Re: Nitroz' Cree in a 3AAA light - terrific! Nitroz shipped it with the three-pack AAA in it. I removed that, added a slit plastic tube around the 18650 to keep it perfectly centered, and stuck a thin magnet on the business end to make contact. I progolded everything, and that was it. Fits...
  7. HenryE

    Sold/Expired Interest thread -- yep, another 18650 Light

    I just bought a Cree+18650 light from Nitroz, and it's remarkable. He modified an inexpensive 3AAA package to take the emitter, and the 18650 fits fine in place of the original battery pack. The lower voltage and higher current capability seem to work out well, and the throw is like a white...
  8. HenryE

    Nitroz' Cree in a 3AAA (now 18650) light - terrific!

    When CPF was on the backup site, Nitroz offered a little 3AAA light into which he had put a Cree. The low price seemed worth a try. In throw, it outperforms the A19/Cree, TL3/Carley, etc. There's a ring or two, but that hot spot is like a big white laser beam. Amazing! A 18650 fits, and the...
  9. HenryE

    Capacity of disposable AA cells - surprising data!

    Maybe meaningless, but that's what's available on the manufacturer's site, and it seems valid for comparing dollars - particularly when comparing similar alkalines. The costly e2 "Titanium" cells really don't seem to be worth the $$ increment over the low-end "Gold" cells, and that's...
  10. HenryE

    Capacity of disposable AA cells - surprising data!

    I can't remember the last time I've seen a cell leak, though it's been many years since we've used a carbon zinc cell in this family. Are modern alkalines leaky - even the cheap (gold) ones?
  11. HenryE

    Capacity of disposable AA cells - surprising data!

    Heck, Tom - I was lucky just to get the $$ correlated with mAH. Thanks for the input - but it still seems that it's not worth spending the extra dollars on the 'Titanium' alkalines, for sure.
  12. HenryE

    Capacity of disposable AA cells - surprising data!

  13. HenryE

    Capacity of disposable AA cells - surprising data!

    I just checked the technical data published online by Energizer and Rayovac, and was surprised by what I learned: CELL CHEMISTRY-------mAH------COST Li-Ion-----------------3,000------$1.50+ E2 "Titanium"----------2,900------$1.00 Alkaline----------------2,850------$0.45 Cheap (gold)...
  14. HenryE

    Building a massive Li-ion battery pack

    I was planning to regulate each of the required outputs rather than tap cells and drain independently. But these responses lead me to the idea of just using a second laptop battery, which is easy enough to pull apart and wire for the purpose.
  15. HenryE

    Building a massive Li-ion battery pack

    I have some 650mAh RCR123 cells that have worked well for me, so would probably use the same ones. Four rows in parallel would provide 2.6A max, which is in excess of the 2A charging rate of the laptop's battery and should be good for more than an hour of laptop use. That's a superset of all...
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