• 3 Posts
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Joined 2 years ago
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Cake day: June 12th, 2023

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  • Sodium ion batteries are going to be the solution. 18650 packs are already out and perform economically. Since the molecules are so much bigger, energy density is only like 60% of lithium based solutions, but they have a very wide temperature range and are incredibly more inert and safe and density isn’t a problem for bulk energy storage.

    The hurdle to overcome in inverters dealing with the very wide voltage span and bespoke charging ICs, but definitely possible and within 5 years will probably become a lithium iron phosphate competitor.








  • I kind of agree. I use accubattery on my phone since I got it so I know more or less how much I have used to charge it.

    1526593mAh over almost 4 years. If we assume 3.9V charge voltage (about average between CV/CC and I only charge it to 80%), then it is a bit under 6kWh consumed, which is under 2€ with our high electricity prices here.

    It uses literally a rounding error of power over its entire lifespan.

    However, having a standard way to test battery life and battery cycle longevity in phones would be very helpful, but I am 99% sure it would be an unrepresentative test that manufacturers would start gaming within a year or two to have very skewed results.



  • Very funny, I stille have an old TPlink running now for 6 or 7 years, my parents had an old linksys that only did 2.4GHz running for 13 years or something. Before i replaced it for them.

    I honestly don’t know how a router breaks. It can become outdated or obsolete such that it can’t interface correctly anymore or it can have a hardware failure that kills it by surges or physical damage, or it can be completely unsecure because it hasn’t been updated in a decade but routing is “fairly simple” and just getting data throughput isn’t rocket science software-wise.


  • Ugh I hate excel. It can’t do the most basic things like search and replace things reliably in all cases. I have moved literally all data analysis besides the absolute basic “count” and “sum” operations to python in spyder. 200x faster, repeatable, won’t freeze up with large datssetd, and has never once failed a basic operation like a search and replace. Not to mention the localization issues and the fact that it will fuck things up completely if you install a new printer because Microsoft decided the printer has priority of your document and spreadsheet layouts over choosing a default.

    I had some evaluation board software that whenever the value dipped below -1, would place the comma completely randomly in the floating point number.

    Excel almost had a heart attack when I asked it to search and replace ”-1” with “-1,” and it found all of the cases just fine, but decides to ignore the replace and not place a comma at all. If I tried to convert them to a number, it freaked out and placed the decimal place also randomly, different than the input. And of course trying to do in-place operations on a column for export is just painful.

    Hell, in notepad++ I could just regex the digit range that was preceded by a ”-1” and get everything replaced using a few brackets.

    Not to mention how terrible the graphs work in comparison and how bad they look with the default options 😅. But hey, you can automatically put in a drop shadow or frame it in a useless way.

    There are some people who can work very efficiently and do some crazy things in excel (like the excel doom) but unless you have literally been using it daily for many years and actively looking for ways to speed up, then it is just as easy or easier to do things in an actual data processing program like matlab, octave, python, or R (And I am not a coder) and you can literally copy paste a file name for the next full dataset.







  • Withings, sadly has absolutely horrific heart rate tracking. This guy does correlation tests with the Polar H10 (skip to the graphs).

    And I say this whenever this comes up in this sub.

    Nothing is European in name only. They only have UK marketing. They have american investors, a shady CEO with a history of lying about his companies (oneplus “starup” BBK controversy anyone?) and everything is designed, coded, manufactured, tested, etc… in China.

    They have started to maybe hire some people to possibly take over a bit of the phone design in the future in London, but the smartwatch is 100% a Chinese product. It even looks exactly like the standard ODM smart watches from the dozen Chinese companies that make all of the generic smart watches that get rebranded.