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Show HN: Hacking a $20 4G wireless hotspot into a texting device

bkovac.github.io

11–20 of 39 posts

Re: Show HN: Hacking a $20 4G wireless hotspot into a texting device

#11

Based on the work the person has done, if they wanted to make something with an exceedingly long battery life, and the battery setup there already seems to be basically a 1S li ion, they could graft in a back side battery holder for two high quality 18650 cells in parallel. It would probably last weeks.

A 10000mAh pouch battery would take up less room and provide more battery life. They are almost as cheap as 18650s too.

Re: Show HN: Hacking a $20 4G wireless hotspot into a texting device

#12

Based on the work the person has done, if they wanted to make something with an exceedingly long battery life, and the battery setup there already seems to be basically a 1S li ion, they could graft in a back side battery holder for two high quality 18650 cells in parallel. It would probably last weeks.

A 10000mAh pouch battery would take up less room and provide more battery life. They are almost as cheap as 18650s too.

How is a 10000mAh pouch more energy dense than an 18650?

Re: Show HN: Hacking a $20 4G wireless hotspot into a texting device

#13

I often ditch my phone and carry my hotspot device for my internet. The only drawback is that for viewing my texts and OTPs i end up putting the sim in my phone or opening up the web interface on my laptop. This seems to work very well as a dumbphone per se.

If you move to an Apple set up, the phone can act as a hotspot and there is no need to take out your sim. Also... you have a physical sim card? I thought those became obsolete.

Re: Show HN: Hacking a $20 4G wireless hotspot into a texting device

#14
post #12

Earlier quoted context omitted.

A 10000mAh pouch battery would take up less room and provide more battery life. They are almost as cheap as 18650s too.

How is a 10000mAh pouch more energy dense than an 18650?

By not having void air space in between cylindrical cells like you'd get with two 18650s? It's mostly just a matter of packaging.

Pouches can be made to have better volumetric density than cylindrical cells quite easily, which is why laptops aren't generally full of cylinder cells anymore; the challenge is just providing them enough external support/compression and swelling allowance, which can be accomplished through chassis design.

Re: Show HN: Hacking a $20 4G wireless hotspot into a texting device

#15
post #12

Earlier quoted context omitted.

A 10000mAh pouch battery would take up less room and provide more battery life. They are almost as cheap as 18650s too.

How is a 10000mAh pouch more energy dense than an 18650?

Pouch cells are lighter per mAh due to the lack of metal casing. But more than the casing, the form factor is better for a pocketable device. The cylindrical form factor sticks out, usually wastes some space, and can’t be neatly tucked behind a board or display.

Re: Show HN: Hacking a $20 4G wireless hotspot into a texting device

#17

It would be pretty cool to put Hermes Agent or some agent system on that thing, assuming the OpenStick build has enough RAM/storage. That would be fire.

What it has at its core is a smartphone chipset from 2014 - MSM8916 or so. Not exactly an AI compute powerhouse.

Re: Show HN: Hacking a $20 4G wireless hotspot into a texting device

#19

Based on the work the person has done, if they wanted to make something with an exceedingly long battery life, and the battery setup there already seems to be basically a 1S li ion, they could graft in a back side battery holder for two high quality 18650 cells in parallel. It would probably last weeks.

A 10000mAh pouch battery would take up less room and provide more battery life. They are almost as cheap as 18650s too.

The neat thing about 18650s though is that you can put a battery door on it and make them swappable, if a person used a holder that can accommodate button top protected 18650 cells. The same cells can also be shared by a bunch of good quality flashlights and headlamps. I have several extremely useful headlamps from "sofirn" that take my choice of cell and have a built in USB-C charging port and charge circuitry protected behing a gasket and twist-open ip67 sealed cap. The pouch battery would be better as an integrated all in one product but also makes the thing a bit less modular.

Re: Show HN: Hacking a $20 4G wireless hotspot into a texting device

#20
post #18

OpenStick is super old though, there are Linux and OpenWRT builders that track the upstream kernel, check hkfuertes and others.

Oh, if it isn't the MSM8916 himself! Fancy seeing you out there in the wild - posting on HN no less!

Is there a guide for cheap MSM8916 platforms you would recommend? There is a hkfuertes repo, but the one I found is archived. Not to say it doesn't work, but that doesn't instill much confidence.

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