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Open Source @Github

fp.

"They had no concept of a duty of care to their users."

https://unsung.aresluna.org/they-had-no-concept-of-a-duty-of-care-to-their-users/
53•jandeboevrie•39m ago•6 comments

In an $80 Motel Room, a Discovery to Shed Light on the Origins of Life

https://www.nytimes.com/2026/09/26/science/motel-science-discovery.html
35•danso•53m ago•10 comments

Replacing the old battery on rechargeable bike lights

https://jvns.ca/blog/2026/09/27/replacing-the-old-battery-on-rechargeable-bike-lights/
39•surprisetalk•1h ago•10 comments

Flip Fluid on Flip Dots

https://mitxela.com/projects/flipflip
246•blutack•1d ago•16 comments

Fakecloud: Local AWS cloud emulator for integration tests

https://fakecloud.dev/
31•theanonymousone•1d ago•13 comments

Font where each token is equal-width

https://twitter.com/amplifiedamp/status/2103535129503383700
3•ampdot•22h ago•0 comments

Unsealed Briefs in Authors’ Case v. Microsoft/OpenAI

https://authorsguild.org/news/ag-v-openai-top-execs-knew-mass-book-piracy-was-illegal/
525•papergirl•9h ago•440 comments

Writing Efficient C++ Code

https://asawicki.info/articles/writing_efficient_cpp_code.php
5•ibobev•1d ago•1 comments

Does Georgism work? Five years later

https://www.astralcodexten.com/p/does-georgism-work-five-years-later
447•silveraxe93•2d ago•338 comments

10 Tells of a Slop UI

https://hereticpleb.vercel.app/blog/10-tells-of-slop
82•theanonymousone•42m ago•56 comments

Go Concurrency Distilled

https://antonz.org/go-concurrency-distilled/
299•chmaynard•1d ago•131 comments

Finally, A True Blue Rose Exists

https://www.sciencenews.org/article/true-blue-rose-pigment-copigment
58•bookofjoe•1d ago•22 comments

PipePipe: NewPipe hard fork implementing SponsorBlock

https://github.com/InfinityLoop1308/PipePipe
461•Qision•2d ago•248 comments

Show HN: A CC0 museum of retro 3D tricks you can paste into a page

https://3d-retro.com/
17•SouthWestAtlas•3d ago•3 comments

Rusty thoughts on "Parse, don't validate"

https://eli.thegreenplace.net/2026/rusty-thoughts-on-parse-dont-validate/
32•ingve•6h ago•7 comments

Ten Lines of Code That Changed My World

https://pixelambacht.nl/2026/ten-lines-of-code/
5•dimonomid•1h ago•0 comments

The internet discovers TLA+. Now what?

https://reasonable.io/blog/tla-tutorial/
74•matt_d•9h ago•35 comments

"As a Language Model": Chat Template Switches LLM Self-Referential Voice

https://arxiv.org/abs/2609.25021
80•yu3zhou4•4h ago•83 comments

DeepSeek Elastic Compute (DSec)

https://arxiv.org/abs/2609.22978
296•shenli3514•21h ago•94 comments

Show HN: Reladraw – A diagram language where you decide where to place things

https://github.com/reladraw/reladraw
353•jpwalsh234•22h ago•93 comments

ASML says it sold 'absolutely nothing' in Europe in 2026

https://www.tomshardware.com/tech-industry/semiconductors/asml-says-its-sells-absolutely-nothing-...
357•MC995•2d ago•770 comments

Biology might not be quantum, but its math is quantumlike

https://www.quantamagazine.org/biology-might-not-be-quantum-but-its-math-is-quantumlike-20260923/
101•pseudolus•2d ago•37 comments

A searchable library of forgotten public-domain film clips from 1915 onward

https://www.movingimagearchive.com/
195•momentmaker•2d ago•26 comments

Fifteen years later, the Apple Cards origin story

https://lexontech.org/fifteen-years-later-the-apple-cards-origin-story
419•ksec•1d ago•109 comments

Exploding variance of means of exponentials: least-squares to the rescue

https://francisbach.com/spectral_log_density_estimation/
52•matt_d•1d ago•0 comments

How I changed teaching after AI managed to do all my homework assignments

https://thelastsoftwareengineer.substack.com/p/how-i-changed-teaching-after-ai-managed
260•azhenley•2d ago•242 comments

An agent used DNS to reach an external chatbot

https://alignment.openai.com/misalignment-reports/an-agent-used-dns-to-reach-an-external-chatbot/
135•apsec112•1d ago•135 comments

Promising discoveries about the potential for life on one of Saturn’s icy moons

https://www.fu-berlin.de/en/presse/informationen/fup/2026/fup_26_116-enceladus-cassini-mikroben-s...
86•geox•1d ago•48 comments

Drawgent: Coding agent on a live Excalidraw canvas

https://tangled.org/yanndegat.tngl.sh/drawgent
169•parasitid•23h ago•44 comments

How to keep enjoying programming in a world of LLMs

https://discourse.haskell.org/t/how-to-keep-enjoying-programming-in-a-world-of-llms/14705
291•signa11•1d ago•307 comments
Open in hackernews

Replacing the old battery on rechargeable bike lights

https://jvns.ca/blog/2026/09/27/replacing-the-old-battery-on-rechargeable-bike-lights/
37•surprisetalk•1h ago

Comments

esquire_900•55m ago
In the Netherlands many people use these kinds of detachable bike lights. I've never came across soldered batteries in the dozen or so I've replaced batteries for. Not always cheaper, but just tossing the whole thing seems like such a waste.

Well done!

cubefox•45m ago
There are also dynamo powered LED lights which only provide light while riding the bike, and about a minute afterwards (I assume from an internal capacitor). They are not detachable but why would that be necessary? From what I can tell they also don't require regular replacement.
kccqzy•31m ago
These are fine for bike commuters, and I’ve had them before. But they are in general not fine for recreational bicyclists; these people pay a hundred dollars for a new tire to shave off three watts and are not about to add any unnecessary human-powered accessories.
bootlooped•14m ago
An exception is bikepackers, who may prize reliability and runtime over brightness and weight. But then the dynamo we're talking about is $200-$400 and that's not including the light.
robot_jesus•51m ago
Love this. I have a pile of nice Cygolites (both front and tail) that my whole family uses that are maybe 8 or 9 years old. Their capacities have largely dropped to the point that I need to charge them every ride or two. Maybe get about 90 minutes of use, down from 3-4 hours previously.

They're not user-serviceable by design but I've been pondering cracking them open and having a go at swapping the batteries. This post may inspire me.

I've got a pile of new 18650s lying around and hopefully the front lights use those!

sandworm101•19m ago
Talk about burying the lead. This was a MEC bike light. It should have a replacable battery!

https://www.mec.ca/en/explore/sustainability-innovation

vohk•8m ago
Ah, memories. I miss the old MEC, before they overextended on real estate and had to sell the farm to private equity. I have a pile of MEC branded gear I'm still happily using 20 years on. I have some restrained hopes for the new ownership group to bring it back, but I'll always miss the co-op.

These lights would have predated the private equity era but I'm guessing sourcing options were somewhat more limited back in 2016.

rollulus•3m ago
I don’t know what it is with Julia’s writing but it always makes me happy. It reminded me of replacing the soldered battery in Super Metroid so I could save my progress again. As a cheapskate I used a regular battery and connected the wires mechanically.
dragontamer•3m ago
I wouldn't worry about matching the exact model number of the battery. Instead, it's more important to get roughly the same chemistry and a capacity equal or maybe a touch greater.

Specific batteries go in and out of production. But as long as it's the same CHEMISTRY, voltage, and capacity, it's likely compatible. Chemistry tends to set the voltage, size sets the capacity.

aenis•2m ago
I know it's slightly offtopic, but the brand I am using - ExposureLights - offers a battery diagnosis/replacement service for their bicycle lights.

Those are on the expensive side, but still, most brands would rather sell you a new one.