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Large 10 kWh 18650 Lithium-ion power pack - What configuration? I need to build a 10 kWh lithium-ion pack, anywhere from 70 V to 200 V.  This is to drive a motor.  Power output will not exceed 15 kW.  The cells will be Panasonic NCR 'B' at 3.4 Ah 18650.  I would like to minimize space and weight and cost. :D  Level of safety would be standard for a hobby application.  Charging will be done in a safe area using two levels of overcharge and overcurrent protection.  Charging is from house current, 110V, and multiple chargers may be employed to double or triple the charge rate.   What is the best configuration for cells?  I would prefer if the pack is broken down into units of 1 to 2 kWh each.  Each unit may be charged separately. In addition to a balancing-protection board and a CCCV charger, what other protection or safety mechanisms are recommended, short of a smart BMS system? I have looked at a cheap Chinese balancing board that offers protection (thermal, overcharge, undercharge, overcurrent, short).  A 20S board will offer up to 84 V and adequate current for the application, for a 1.5 kWh unit.  At 1/3C, I would need a 83 V 6 A CCCV charger.  How do I get one of these? Off-topic question:  Can a balancing-protection board be used for a configuration with a lesser number of cells? Such as using a 10S board to control an 8S configuration.  Or does this depend on the board? Finding the search terms behind 'not provided' Mid-1980s animated theatrical release Though at the time I saw it I did not know it, this would be called "anime" today. It was in English, and I don't remember if the characters lips matched the audio track. I couldn't have been older than about 3rd grade, so that puts it around 1985ish I believe.  It was released theatrically in the United States, I do not know if it was a limited release. I saw it in Cincinnati, Ohio. No idea what movie theater chain.  The story was rather typical, young man who goes on the hero's journey. Definitely science fiction elements (flying vehicles, maybe spaceships). He comes across or is given a sword hilt without a blade. He learns to use it, and when he does it acts as if the blade is there. At the finale, he has lost the hilt entirely and, thinking that he has lost, almost gives up. But a (voice in his head, his mentor, can't remember what) something tells him to try despite this, and it's as if he has the sword even without the hilt. He then triumphs.  Can anyone identify this movie? Retrieving Wikipedia's coordinate information? I'd like to add icons to my map showing locations which have Wikipedia entries.  The  is a great resource for determining Wiki entries near an XY location, but it has limitations (20km radius, 50 points only) which make it unsuitable for my purposes.  Ideally I need the map to show ALL locations with Wiki entries, so I guess I'll need to download the Wikipedia dump file and parse it for geocoded entries.  Where is this information found in the Wikipedia dump files?  The Wiki database may be downloaded from  but I can't see which file(s) I need to search for the coordinates.  For example, the  includes:  Coordinates:    33°51′35.9″S 151°12′40″E   Where is this found in the dump files? Another way to phrase the question is "how can I determine which Wiki entries are geo-coded?" I have a complex command that I'd like to make a shell/bash script of.  I can write it in terms of $1 easily:  foo $1 args -o $1.ext   I want to be able to pass multiple input names to the script. What's the right way to do it?    And, of course, I want to handle filenames with spaces in them. What does the [Flags] Enum Attribute mean in C#? Is there a way to see that $ \nabla_\mu g_{\nu \rho} = 0 $ without explicit computation, where $\nabla_\mu$ refers to the covariant derivative? In books, it is usually said that this is a consequence of the fact that parallel transport preserves dot product. How ? Layover in Europe to the US - allowed? Can you choose which version of a game to play on Steam? PHP Error - Uploading a file Articles: When do I use "a", "the", or "__"? YA novel where clumsy boy gains wings I'm trying to remember the name of a novel I read as a pre-teen.  If I recall correctly, it would have come out in the 90s (though it may have been a reprint).  The novel is set in modern times.  I recalled this because I've been reading a lot of urban fantasy lately, and this may be the first 'urban fantasy' book I read - our world, but with a touch of magic.  There's a somewhat clumsy, out of shape teenaged (or almost teenaged) boy who doesn't have a father.  His father had been a stage magician who was constantly frustrated by his son's complete inability to preform stage magic, despite a prediction saying he would have a great or powerful magic.  His father had died before the book started, I don't recall how long before.  The boy does something nice for an old woman (I don't recall what) and she gifts him a magical potion.  A drop of it, rubbed on his shoulder blades, will make him grow wings.  The book follows him for the summer, as he spends his evenings flying.  He makes himself a toga-like shirt out of some old curtains and spends time flying around at night.  I recall one scene where he learns about two children out in the middle of the bay (perhaps the book is set in San Fran?  I don't recall) in a rowboat with one oar.  He saves them (by pulling them back to shore using a rope they had with them) and gets mentioned in the paper as an angel.  At the end of the book, the potion has run out.  There's only a tiny little bit left, and when he rubs it in, it creates only a single feather.  Around that point, the boy realizes that he's no longer getting winded going up several flights of stairs and he's gained a lot of self-confidence.  From what I remember of the copy I read, the cover featured a shirtless boy wearing jeans standing in front of a mirror, looking at the large white feathered wings that had grown from his back. How about newlines within comments? I am aware that comments have only a simple field, with no formatting possible and that is fine (if formatting is needed, your comment should actually be an answer!)  But I find some comments hard to read because they are mainly one giant line (of up to 600 characters!). Any newlines entered during the redaction of the message is stripped from the published comment.    Would it be possible to preserve those newlines? (but may be deleting empty lines, to prevent abuses like a comment taking 600 lines because a prankster could find amusing to post a 600 newlines comment!)    Let's recap:   what we need (and can actually preview while typing a comment, making it more readable, both for the writer -- and the reader, should newlines being kept): declined for newlines (why? no reason given at this time.) what we don't need but is "nice to have" (even though we cannot preview those): granted for bold and italic text. what we really don't need (and cannot not preview): granted for... __code sample__!? Code sample? Seriously? In a comment?   In short: What was an incentive to post a new answer (because of the lack of formatting) is now further diminished. But the comments remain published as one long-hard-to-read-gigantic line. Is there a way for non-root processes to bind to "privileged" ports on Linux? It's very annoying to have this limitation on my development box, when there won't ever be any users other than me.  I'm aware of , but none of them do exactly what I want:    (The version in Debian testing, 1.0, only supports IPv4)  (the "nat" table is not yet implemented for ip6tables, the IPv6 version of iptables) sudo (Running as root is what I'm trying to avoid) SELinux (or similar). (This is just my dev box, I don't want to introduce a lot of extra complexity.)   Is there some simple sysctl variable to allow non-root processes to bind to "privileged" ports (ports less than 1024) on Linux, or am I just out of luck?  EDIT: In some cases, you can  to do this. What is the difference between "information on", "information of", "information about" "Information on something", "information of something", "information about something" — these three usages all sound having the same meaning for me. Are there any differences? As per the title, what hardware do I need to be able to run various versions of Android? "Answerer" and "asker" Why Faces eat each other? Function with limits only at irrational points This is the starred example 5.1.8 in Krantz' Real Analysis and Foundations.     Give an example of a function $f: \mathbb{R} \rightarrow \mathbb{R}$ so that $\lim_{x\rightarrow c} f(x)$ exists when $c$ is irrational but does not exist when $c$ is rational.   I'm aware of the Dirichlet and Thomae functions but this seems slightly different. I'm not even sure a solution exists. Thanks for any help! Show that $\phi(n)=\frac{n}{2}$ if and only if $n=2^k$ for some positive integer k. I think I have it figured and would like to see if I am on the right track. Thank you.