Yes, exactly. The device that comes closest to what I would say feature complete is the HiBy M300 for 200$. It has Android 13, modern specs and most important s

Yes, exactly. The device that comes closest to what I would say feature complete is the HiBy M300 for 200$. It has Android 13, modern specs and most important support for OMTP headphone remote control (Sony A306 does not have this). But the M300 is way to clunky for my taste (4" display, pretty big device) and even more important: No android app fits my needs in terms of stability and reaction timings. However, I found a way to mod one of my iPod Nano 7g (i got plenty) by milling out the aluminium backplate to fit in a 600mah iPod Mini battery. It's too thick, but width and height fit perfectly. With a protecting silicon case I now (kind of) probably own the only iPod nano with replaceable battery (without taking it apart completely). This is also kind of dangerous, because the battery has no real protection except the silicone case and as we all know lithium batteries are the worst when penetrated or bent. I'm working on this but still: 600mah is nearly 3 times the capacity of the original one :-) There is also recent progress in hacking the iPod Nano 6g / 7g, but I think nobody cares any more... see https://github.com/CUB3D/ipod_sun https://github.com/CUB3D/ipod_sun for details.