Hello! My name is Dirk and I will be developing a lot of fun and funky, usefull and completely useless stuff in the future for the fairphone 2. For your reference: I made this , this , these , this , this , this and even this . And maybe some other stuff too. I will be logging some stuff here and here . …

For testing this I am still missing the complete pinout of FP2 battery and maybe internal existing PCMs inside FP2 battery.

Do not connect two batteries in parallel: https://www.reddit.com/r/AskElectronics/comments/1p0uiw/asking_for_clarification_on_wiring_cell_phone/

From your link I cite Apathetic_Superhero: "Infact, without building some extended safety circuitry (it doesn’t have to be very complicated) I wouldn’t do it. We weld cells together ranging from several to hundreds of cells at a time. " This topic is about possibilities to extend FP2 hardware. Fe…

Fair point, @anon9505190 :slight_smile:

[image] anon9505190: Given the hunchback case there would be only connecters to be created instead of erratic cable bridges. Not sure what you are planning to do. Most batteries (if you don’t buy them as “soft packs”) come with a PCM. I’ve linked to a few PCMs here in the forum a while ago.…

thanks for your answer. You find me really stunned due to your attempts and FPs denial. Even the pin out of the battery was kept secret. Otherwise you already would have received this bare external battery infos (4 pins). Now I don’t have to wait for Kees’ answer on the same question . He is outsid…

You could try the “save” approach that doesn’t need fancy extra knowledge. Just charging the phone by the other usb port but by using a bigger hunchback battery. Most kids these days look pretty happy with an extra battery pack in their pockets. So all you need is a big hunchback case that fits re…

[image] anon9505190: I want to double original FP2 battery while I already have the fitting 3D-FP2 case available. can’t help quoting my self from the beginning. Curiously enough when you answered first when I was rather sure you have been first who could have known what I simply want to do. …

Dirkv I saw on your github about using FTDI. Please reconsider and use a STM32F042 or similar instead. Those MCU has builtin USB device mode and HID or VCOM drivers. That means no wierd buggy FTDI drivers needed. And there would be plenty of pin that can be used for cool stuff to connect external…

Have you used also linux drivers for FTDI ? (I did)

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