:warning: This post contains instructions that can cause severe harm to you. :warning: Opening and modifying batteries is very dangerous. added by @douwe Do you think it would make sense to make a phone that would use a built-in cylindrical li-ion 18650 battery as its power source? https://vap…

Perhaps an adapter in the battery compartment taking in a few AAA batteries and a corresponding back cover with a respective dent in it would do. It would be ugly, but it would eliminate any battery trouble after EOL of the phone :slight_smile: …

Those would be thinner so in that sense they would work better, but I don’t think they are widely sold in li-ion format. Alkaline batteries would of course not make sense, Ni-Mh I don’t really know about.

Do you have one of those batteries at hand? It would be a nice story for the #hardware:diy category to try one of those on the FP2 (at your own risk!). One problem I see is that the 18650 doesn’t have any protective circuitry built-in, if I’m not mistaken. That would mean that a phone would have to…

I do have a couple at hand but I don’t think I’m hacky enough to attempt something like that. Well, maybe some day. Many 18650 batteries actually do have a protective circuit built-in, like mine. This means that they are a millimeter or two longer than 65mm, but that should be fine.

[image] Joel_Enwald: This means that they are a millimeter or two longer than 65mm, but that should be fine. Is that longer than the FP2 battery compartment? [image] Joel_Enwald: I do have a couple at hand but I don’t think I’m hacky enough to attempt something like that. Well, maybe som…

Well now you made me want to test this :smiley: My battery is about 66.5mm long, and it just barely fits lengthwise in the battery compartment. A snug fit, no room to move lengthwise. Yours is a pretty fun idea, and who knows, maybe I’ll try something like that if Fairphone releases their models for…

[image] Joel_Enwald: However, I was more thinking of this idea as something for the FP3, or an even later device. Leaving aside the polarising nature of a bumpy design which will not help with sales, I have problems imagining book cases and flip cases with a bumpy design like you imagine, and…

Once I had a Casio Cassiopeia handheld pocket computer. For those you don’t know how these look like - they were like a normal 7" smartphone without the phone circuitry. Running Windows CE. And it was possible to buy add-ons. I had one: it included an extra battery and a PCMCIA-port. The battery was…

Hey there! So, I might get my hands on like 2 of those Adapter PCBs for the Extensions Pins in the phone. Once I have those I could probably experiment around a bit with using 18650 batteries (or similar) with a FP2. The challenge I see in this is following: Build a circuit to safely charge and…

Here is a lot of information about 18650 batteries: https://www.electricbike.com/inside-18650-cell/

Making a phone that would use a 18650 battery

Discuss The Industry

xhino_paris February 19, 2018, 9:04am 16

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