Recent content by dgbrookman

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    Looking for a 2 slot travel USB AA Ni-MH charger

    Yeah, count me as another that laments the discontinuance of those wonderful little Sanyo/Panasonic chargers. Someone else mentioned the LiitiKala Lii 202 and that would be a good option. It's noticeably bulkier than the Sanyo/Pana chargers but on the plus side it can charge at a higher rate. I...
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    budget light w/usb port

    A few more details on what you're looking for would help. If a fairly conventional 18650 based light would suit, there's the Eagle Eye X2R. It's somewhat like the Convoy S2/S2+ except it also has a micro-USB charging port. I have one and it works OK but I don't use it much. My main purpose for...
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    Please help a 18650 noob.

    As others have said it's great that you're being careful. To give you peace of mind you might want to consider a protected 18650 cell. I have both the S2 and S2+ along with protected and unprotected 18650 cells. I've put them right in front of me and will give some observations that might be...
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    Anybody heard of QuiqLite handsfree clip on's?

    Re: Anybody heard of QuikLite handsfree clip on's? In case anyone is trying to find info on this, it seems the company is called QuiqLite, not QuikLite. http://quiqlite.com/ Somewhat unusually, the "medical" version is the cheapest. More often it seems that calling something "medical" makes...
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    La Crosse Charger Help/Tips

    I've had a LaCrosse BC700 since 2010 and your experience with finicky buttons on the BC900 sounds very familiar. Maybe it's just a LaCrosse thing. I used to charge at 200 mA on the assumption that gentle charging would be easier on the cells. But according to several credible sources charging...
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    Best rechargeable AA/AAA batteries?

    I haven't had good luck with Powerex -- they fizzle out before giving as many charge cycles as I'd expect. But other people like them so maybe I'm doing something wrong. Of the second-tier brands Tenergy has performed OK. Amazon Basics are hit-or-miss. Amazon obviously doesn't make their own...
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    1D lights?

    Without a resistor Vb = Vf, which measured 1.516 V. Since there's no resistor we can't use Ohm's Law to calculate I = V / R. However -- as mentioned there is a more-or-less linear relationship between I and Vf once you get past the low-voltage "knee" in the curve. Eyeballing a linear fit to...
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    1D lights?

    Finally got around to picking up a couple of these and did some testing. I don't have a 1D battery holder handy so I just rigged up something by taping test leads onto the supplied heavy-duty cell. Here are results for various resistor values. R Vb Vr Vf I eff hours days 10...
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    Question about voltage vs amps

    The rule is fairly simple: If you connect two batteries in series, the voltages add together (but the capacities don't). If you connect two batteries in parallel, the capacities add together (but the voltages don't).
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    1D lights?

    Humpf. If it's true that "a little knowledge is a dangerous thing" then I am Han Solo, the Incredible Hulk, and James Bond all rolled into one. As Lynx Arc says just above it should be possible to work it out with Ohm's Law (which is pretty much all I know about electronics). Assuming you...
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    1D lights?

    Thanks for the clarification. Any idea how much power is dissipated across the resistor? To my limited understanding of these things, the LED doesn't appear as a simple resistive load so a straightforward Ohm's Law calculation wouldn't work. I'm asking because it could be useful to specify...
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    Any AA/AAA charger that plug directly into USB? Looking for recommendation.

    Do you mean without a cable? The only one I know of is a little super-dumb charger that doesn't even have a timer. (Having said that, the thing does have its uses, such as giving an initial boost to a dead-dead-dead NiMH cell that a smart charger won't even detect.) If you can allow a cable...
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    1D lights?

    Just to verify, is this the one? https://www.walmart.com/ip/Eveready-Economy-LED-Flashlight/50033830? Gotta check these things before laying down the princely sum of $2.47. :p Seriously, thanks for the pointer and discussion. I can see lots of uses for a long-lasting, modest output light...
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    What LED flashlight is sitting on your nightstand?

    Nitecore Tip. That 1 lumen low is perfect for getting around a dark house without bothering anyone else. Yeah, I lead kind of a boring small-town existence. Not a high crime area, nor lots of roaming beasts (except the neighbor's pain-in-the-neck cat), nor anything else that would justify...
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    The Non-Volatile Variable Storage is About Full

    This may be helpful: https://superuser.com/questions/1081537/lenovo-thinkpad-t450s-error-the-non-volatile-system-uefi-variable-storage-is
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