Recent content by recycledelectrons

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    Reduce 12v battery out while maintaining a minimum amp out

    DX has some DC/DC converters that will step up and then step down (so there's no drop-out issue,) that run up to 1A without a heat sink and up to 3A with a heat sink. http://dx.com/p/dc-dc-converter-auto-step-up-step-down-solar-power-supply-module-red-151576 I've used one successfully to run...
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    600+ lumen pocket carry flashlight that doesn't guzzle battery life?

    You could use a miltipl-emitter light, as XML emitters (for example) are more efficient at 1A than at 3A. Putting 3 of them in a light does make it more effiicient. I wonder...is there a single-18650 x3 XML light that someone could recomend?
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    Lessons from Sandy Storm power outages

    I agree completely. My frustration comes from not being able to find an 18650 powered boombox that plays MP3 from USB drives, that has an AM radio built in. For some reason, AM radios and MP3 players are mutually exclusive. I ideally, it would pick up shortwave broadcasts also, but that's...
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    Lessons from Sandy Storm power outages

    More excellent points!
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    Lessons from Sandy Storm power outages

    Excellent points! Bravo to the preapred!
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    what's the best car distress mode? any experience

    Make sure you put lithium primaries in whatever you buy, 123A or AA. Make sure it can not get turned on by mistake. Turning one battery backwards in a x2 AA light will work, if you explain it to her, and put a big label on it explaining that one battery is backwards. Make sure it does not get...
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    Newbie -- why aa vs. aaa vs. 123

    There's a lot of misinformation on this thread. You can find very birght and very dim lights for every battery size. The things that matter about batteries are (in no particular order): (1) Size (2) Weight (3) Maximum discharge rate, in Watts (which is the maximum discarge current * the nominal...
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    DIY Projector Light Source Needed!!

    What do you mean by 250W-300W? Do you want it to consume that much power? Do you want it to put out the equivalent of a 100% efficient LED that would consude 250~300W? Do you want it to burn off 250~300W of heat, and put out an irrelevant amount of light? Do you want it to put out as many...
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    Damaged Eneloop

    Most of my Tenergy NiMH C and D cells look like that. It does not seem to be a problem after hundreds of cycles.
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    Can a Hobby Charger charge the Lead-Acid battery that powers it?

    I've noticed that (with my cheap hoby charger) I put in fewer mAH than I pull out of batteries, almost like the battery wa giving something up while cycling. I'm sure I'm missing something, but my repeated observations have been bugging me for a few weeks now.
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    Almost died! Need light for warning approaching boats at night.

    HD2010 There are 2 versions: UltraFire's HD 2010 and FandyFire's HD2010. Prices range from $28 to $45, including shipping. This is a single 18650 light with 5 modes: high, medium, low, fast strobe, and sos. I'd try high or fast strobe to get their attention. Don't forget to get at least two...
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    Is there a budget light that will meet these specifications?

    You don't need a lower low, you need a stash of batteries and car chargers. Most of your chargers have a DC input jack already! Get a few cigarette-lighter-power-splitters so you can keep everything charging at once. Remember to idle your car for 15 minutes every day to charge back up the...
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    Realistically, how large a portable solar panel for charging 2-4 Li Ion batteries?

    That 30W panel would work. Here's how I figure it: You are charging from 3.5V to 4.2V, so 3.85V is half way in between. The best 18650s are currently rated at 3.4AH. 3.85V * 3.4AH = 13.09 WH per cell 4 cells would be 52.36 WH Since your charger is not 100% efficient, we need to factor in some...
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    Lantern recommendation needed!

    The best lanterns I have are "Energizer Weather Ready Folding Area Lanterns" that take "D" cell batteries. Fluorescent lanterns really light up a room. Get some dry cells for it...or have your GF recharge the rechargeables off her car's cigarette lighter (but hide the charger or her window might...
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    Voting in Texas

    Here's an experiment to see if your vote really counts: Vote for a write-in candidate who is registered with the Texas Secretary of State's Office. Then, after the votes are counted, check to see if that candidate got any votes in your precinct. (Most write-in candidates get zero votes in most...
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