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How energy and cost demanding is the process to recycle spent or failed lithium batteries to recover lithium into manufacturing new batteries ? From years of experience, only about 25% of lithium batteries get spent; most have a single cell failure that forces discarding the whole relatively good package. Is a non-spent cell from such pack yielding better/more/easier recycled lithium than a truly spent one ? What compounds are not recoverable into lithium in a spent battery ? Does a failed cell contain 'better' lithium than a 'spent' one ? What about when recycling new unused/obsolete cells ?

I have not found yet non-magnetic cast iron.

Thanks gentlemen for your responses. I have it clear now. The linked volumetric table suggests water and iron as good simple-to-implement candidates. Will then store heat in one of them and set the heat release speed as needed by covering with more or less insulating material.

Hello. What is the table I should look for to find which materials have the capability of holding/storing more amount of heat ? I do not care how fast they conduct the heat if their parameters are related; and what is it called ? specific heat ?, density ? specific gravity ? , heat conductivity... Example : 1 Kg or iron at 100C or 1 Kg of water at 100C or 1 Kg of concrete at 100C or 1 Kg of wood at 100C... And does it go by mass, or by volume ? As in 1 litre of iron, 1 litre of concrete, 1 litre of water instead ... ?

Thanks. I already have all those, and range, and appliances plus 9KW electric forced-air heating system for the whole house. My electric energy bill is $0 monthly from a 5.6KW solar system. The original post above is only for 3 surplus panels to add heat; do I heat air, water, stones in water or metal in water or something else? for late night heat emission ?

Good morning. Had 3 spare solar panels dormant for months; decided to put them to work for helping heating the house instead of sheltering spiders in the basement. Panel1---panel2---panel3-------------hotplate stove Panels are 40VDC / 400Watts each; the series yields 120VDC capable of 1200Watts at full insolation. Yes, the 'burner' gets very hot and has to be contributing warmth into the dwelling. Now; is it better to warm the air during daylight or put a pot and heat water (or rocks? or junk metal?) lasting more time into night time ? What would you do ?

Hi. What is the typical current allowance you would give to a 10 year old these days ?

Hello all. When the switch is on, 10 Amperes flow trough it. When the switch is turned off, there is arcing between its contacts. ---------------------------------------------------------------------------------- Added resistor to circuit, consumes 0.025A tiny current. When the switch is on, 10 Amperes flow trough the switch. When the switch is turned off, is there arcing between its contacts ?

Hi. Try deleting items in the recycle bin that qualify. Delete temporary files. Shut off WiFi and plug the ethernet to evaluate difference. Check all the installed RAM memory reports complete. Check available unused space in the hard drive.

Would this put to spin fast be able to carve silicone in your opinion ? [ hypodermic - injection needles ] Or a U gouge chisel ?

Thanks, gentlemen. Can anyone please translate what is called a 'needle' here ?---> https://vimeo.com/236164661 Seen rubber stamps made with a pinkish very soft rubber... how are they made? Casting or carving ?

Hi. Any methods for milling channels in silicone rubber that you may suggest ?

Thanks. After the photovoltaic layer under the sun, there is not much useable energy to collect the whole 1 KW/m2 Solar panels give me winter electric heating by accumulating all year radiation. The panel aluminium frames are almost 5cm void under the cells. Closing the lower frame void I can make their heated air chamber to circulate into a dwelling to yield more heat. How else to wring the 1 KW/m2 leftovers ?

Hi. Solar radiation in all its flavors of infrared, visible light, ultraviolets and all the rest whatever they be hitting a roof for a standard figure of 1KW/m2 What device could collect the most solar energy of all kinds installed on a roof ? Photovoltaics can collect about 18% into direct current.

The wings pictures above do not have winglets for reducing vortexes.

This is not a video, but the link to it shows - screen capture - Better image found :

Hi. From memory, the belly red; the wingtip white strobe and the top red of fuselage beacons flashed sequentially; not simultaneous. The questioned wingtop row of dots may be coincidental with one of them flashing. The dots appeared like tiny 10mm diametre / 3mm high bumps when seen with the ambient light after aircraft stopped, but their diffused light was like 5cm diametre as seen on image. There is a possibility of being reflective adhesive tape dots. My vision is not superb, but was not a dream.

Thanks. Nothing to do with leading/trailing edges nor extends. On top of wings. Flashing during all clear night time trip. Seems Embraer RJ 145. Commenting with a passenger on the right side window, we asked the flight attendant who guessed whatever to answer. From the strong curiosity, found an almost decent image of the lights location, at daylight. Center upper of image below. Ahead of ailerons. Unable to magnify. The nearest is a group of three, then farther another nine, as in post 1 L ooooooooo ooo ==================================== ooo ooooooooo R Same details, in video, not flashing ---> https://www.youtube.com/watch?v=OfV9DnYPyo8&ab

Hi. On a recent flight, perhaps on an Embraer aircraft, noticed diffused flashing red lights on top of wings that I never saw before. Anyone knows ? Took a video but does not show the detail, I was unable to ask the pilot at exit. They are near the 'ends' of wings tops, a centered row of 12, aiming upwards ? Seem as diffuse as if the wing was translucent and lit from the inside. Just curious. L wingtip ooooooooo ooo =================== Main fuselage =================== ooo ooooooooo wingtip R Found a image on the web to better explain the location of those lights on top of wings.

Greetings What makes the shaving products work ? Its application on skin, some action on the facial hair, lubrication? something to do with the sharpness of blades, slipperyness, edges grabbing onto hair, some displacement or not of hair piling on blades ? Seems an optimal thing developed trough years; trying soap, just water, dry, others, is not as successful. Can you explain ?

Hi. I know peanuts about this; that is why am here. Is there test strips that show if it is ethanol, or methanol, or some other compounds when distilling alcohols ? What sorts of identifications/concentrations are test strips made for ? pH and nothing else ? What about salinity ? Glucose ? ...?

Plants, as convert non-living minerals to living and edible sources.

Regards. It is claimed as possible, people does it or so they say, applying a magic powder/compound this-or-that-and-that-too, on such moon phase 'after a rain' to a cut twig, roots develop and then is planted on soil. Nice. OK. I want to do that to a 10cm diametre branch 6 metres long cut off from a very mature 15m tall productive healthy mulberry tree. What is to consider for success ? Or needs the expertise of only an experienced expert with green thumbs ? Is it not science where you do one thing and the result comes as expected ? Yes, I want a tree producing fruit in my backyard much sooner than waiting 5-10 years. The secret, please ?

Greetings. Half a dozen in my house, and other places I maintain with several more also of the not-vintage types. Have replaced them, cleaned them, repaired capacitors, switches, wiring in them but never saw an obvious lubricating points above or below them nor seen owners manuals guidance to oil them. Do they need some dismantling in order to lubricate or there is a clever access to the proper point; or simply is a chinese discard-and-buy-new as if few drops of oil and little effort is too much to ask ?