It looks like a "JST style: wire to board connector" but you have to measure it in order to find the specific name. And/or simply contact Valve or maybe JST, whom might have the answer. Copied (and lightly edited) from Wikipedia: JST connectors are electrical connectors manufactured to the design standards originally developed by J.S.T. Mfg. Co. (Japan Solderless Terminal). JST manufactures numerous series (families) and pitches (pin-to-pin distance) of connectors. JST connectors are used in many types of products, and commonly used by electronics hobbyists and consumer products for rechargeable battery packs, battery balancers, battery eliminator circuits, 3D printers, and radio controlled servos. The term "JST" is sometimes incorrectly used as a vernacular term meaning any small white electrical connector mounted on PCBs.

in my experience it is usually the Dock/charge port flex, causing this issue. that said it could also be the battery and logicboard.

since this guide does not mention it, your best option would be to open it yourself. Then note down which battery you need, and add it to the guide. somewhat good news, is that the battery is soldered on so you just need to find a battery with the same voltage and a size that fits.

It means that the dock/charger flex is either broken or not connected properly. in my experience it is "broken" and simply replacing it is enough. here is the iFixit guide.

Try continously pressing "D" while powering on. this starts an LCD test. if that does not work try resetting the CMOS manually. By removing the CMOS battery

the moisture detection shows up if the port and/or the cable is dirty or just corroded enough that they don't quite give the expected amount of power. Try cleaning the port with a toothbrush and some isopropyl alcohol. If you have a magnifying glass and a good lightsource you might even be able to see your problem And if that does not help. You might need to replace the port by yourself or using a repair shop. Ps. Some people claim that they bypassed the warning by plugging it in, then force restarting the phone. (Power button + volume down) but only you can confirm if that does the trick. Good luck (⁠•⁠‿⁠•⁠)

I believe that the upper option (GH82) Is an original battery, And the bottom (EB-BA) is an aftermarket copy. From what I can find, on other sites GH82 is always marketed as Original, Whereas EB-BA is mostly marketed as aftermarket. But you should contact the sites customer service for a definitive answer. And please remember to post the answer here for others to find.

Hello There. The NFC antenna is part of The flashlight module. and needs to be "Grounded" to the frame with a screw. Specifically it is the upmost metal piece/screw hole that needs to be screwed in (see image). I just had a device myself with the same problem so i am a 100% sure.

you can probably separate the lens from the kit you bought. however its easy to break it while doing so. "I do not intend to open the phone and was hoping for a relatively painless repair" it should be painless, but depending on how broken the lens is you might want to open the phone and take out the camera during the procedure. so as to not get glass dust on the actual lens and in the camera. Good luck!

as far as i can tell its not an accessible sparepart. however a micro soldering technician might not need one. if i were you i would find a shop and ask if they would be willing to try. another (riskier) option would be to find a broken pair with a working mainboard. sometimes people will sell a pair with a broken headband for 20$