the weight of the phone is around 200 gramm.
The battery weight is 66 gramm, the razer phone alone without battery and without backcover weight is 129 gramm.
So the battery has 1/3 of total weight.
If i can get rid of the battery INSIDE the phone and place it anywhere else, closer to the head. If we reduce weight of headset of the parts that are located more/most distance to the heasd, the leverage effect will result in smaller effect.

so iam looking for an smartphone FPC expansion cable with connectors.. male and femal ends.

the battery is connected with a FPC pin motherboad connector, 6 pins.
P+ ID P-
P+ P-
P+ NTC P-

ID – is a battery Identifier… this can be a showstopper
NTC – is thermistor, a resistor with a special ohm value curve alonge a certain temperatur range

the FPC connector at battery side looks that:
https://www.amazon.in/HUKATO-Battery-Motherboard-Connector-Nokia/dp/B085QN1P88
or here
https://de.aliexpress.com/item/32881726668.html
„2 STÜCKE Inneren FPC Steckverbinder Batterie Halter Clip Kontaktieren für Xiaomi 5 6 mi5 mi4C mi4i mi4 mi6 mi5S mi5S plus mi hinweis 2“

I could not find the part for razer phone BUT i found images for other phones that look visualy like razers one.

So, first try. i bought a 10,-€ battery for Nokia 5.1 ( HE342 / HE361).

When i plugged in the nokia battery, that has same voltage rating, but not same capacity, and not the razor like ID, the phone starts as normal, display shows animated logo..
BUT as soon as you can enter the PIN.. the phone shows message „Shutting down“.
So it does not work, i guess the software is not accepting the different battery ID.
If the startup would check that battery ID first on bios start.. the phone could shut down earlier.

Next Steps:
So i need the correct battery ID.. so i have to get a old razer phone battery from ebay and look if there is a chipset anywhere.. i wont break up my working razer battery for that.
OR
order the female and male connectors from Aliexpress.

other sources/suppier in Germany/Europe
https://de.aswo.com/index.php?id=1921&L=2

battery may be so expensive that it could be better to buy a used razer phone.

desolder from board parts…

https://www.ng-mobile.de/ platine service repair B2B

crazy equipment
https://www.mobileparts.shop/tools/by-category/battery_tools.htm?filter6=767&lid=3

it is done

looking back, the years before now, this project could have been done earlier (, but at higher costs)

the PSVR was available from: 2016-10

the Nvidia Streaming and Moonlight App was available: 2014-09 (GTX 980), App sinde 2016 in GitHub

the Razor Phone with 120Hz was available: 2017-11

the BOSCH BNO055 was available: 2016-06 ( bst-bno055-an009.pdf )

3d printer Artillery Sidewinder X1: ?? 2018 / 2019
3d printers boom: 2015 – ( https://sifted.eu/articles/europes-3d-printing-boom/ )

OpenTrack software (free): ???

[Show as slideshow]

NEXT TO DO 2021-01

the BNO055 HeadTracker is working now,
the Razor Phone gives nice 120 / 90 Hz gamestream via USB,

its time to disassemble the PSVR headset again and ressemble in modified way as follows:

if i use most of PSVR and use dremel-drill to work out no needed original lenses and middle nose part to get a full window, i can look through.
Going that way, i could use the plastic rubber facemask.

Then take measures and use orig screws/holes to fix the RazorPhone2 in orig display position.

I will try to use a glasses with 3-5 diop , and not build in the glasses/lenses into the headset.
to have the glasses closest to the eyes it is best to wear glasses like sunglasses… and not as lenses milimeters more away from eyes.
.

in december 2020, cinema2go offered 60% discount, so i gave it a chance and ordered

the product reached first the german lokal ZOLL export department, to pay taxes.

First test of the MOGO HDMI.. it is very light weight..
plugged in the HDMI and the USB cables…
I started my PC Win10, and see that the MOGO uses a topfoison display
https://www.topfoison.com/display-for-fpvraspberry-pi.html
https://www.topfoison.com/2018-03-28_52720.html
on topfpoison website i can read that this display supports max 60 Hz.

The HDMI and USB cables are with estimated 1m, not long enough for my „gaming“ rig.
Using windows display settings and not the geforce,
i set the display „2“ to 1440×2560 60Hz and set to horizontal,
then the MOGO screen shows correct view.

First impressions:
When screens is black, it seems that there are some pixels malfunction, not black.
The lenses cause distortions.. barrel and cromatic..
i will not use this in that form.

and the screen is only sharp, when the picture stands still,
in other case.. it will blur a bit…
i dont know, if that effect caused by display technic or by the windows driver, or even comes with 60Hz.


My conclusion:
So i decided to rip the MOGO in parts,
to use, to test CARSON +4dioptrin plugable glasses.
https://www.brillen.org/no-name/carson-od-14/
and the result should be much more worth.

So for that new project, i need to create new parts in autodesk fusion360 to print the needed parts in 3d, using the 3D printers in our local fab-lab/makerspace.

MOGO uses a low distance eye-to-display, that is the reason that special lenses are needed, which will end up with distortions and other drawbacks.
With my changed setup, i will have to use a greater distance eye-to-display, thats seems possible to me, because the display is so leight weight, so that a lever, caused by greater distance should not have great effect.
A greater distance eye-to-display is better for the comfortable view to the display corners, as long we go with 16:9 landscape!

now i have following parts:
– Display with connectors(HDMI+USBmini) and with foldable left and right „arms“.
– lense holder with a nose part
– face mask with strechable rubber bands for head

TODO:
– create a holder for Carson lenses, that can connect/plugged to the facemask, as like as the orig lense holder before,
lense position:
depth: the lense has to sit closest to the eyes/face with slight or now touch.. but not more than 10mm away…
vertical: adjustable
horizontal: fixed
– stiffen the foldable arms
– create extensions of the arms
– connector between arms and face mask

i7 4th generation, 16GB, GTX980 4GB,
ACER windows mixed realtiy HMD

installed windows mixed reality 
installed Steam for Windows mixed reality

installed VorpX, Desktop Viewer (not free)
Steam App – BigScreen (not free)
Cliffhouse Store – BigScreen (for free)
Cliffhouse App – Desktop

Warthunder installation direct from WarThunder page
Warthunder installation from Steam

playing VR using WarThunder and set launcher the option VR
Attention:
if VorpX gets activ everything is messed up..
you have to go into VorpX settings and add process aces.exe, is not enough to add  file launcher.exe , to do that you have to start the launcher, start game and hit Windows key to go back to desktop and into VorpX settings to exclude files/processes, aces.exe will be listed and you can pick this up and exclude

playing WarThunder in VR means playing max 90fps.. that the max fps value the HMD can reach.. we dont need to waste power to calculate more frames per second as realy needed..

Tryed to play Warthunder 2D(VR option disabled) in VorpX, but that did never work.

Playing WarThunder in VR/3D works
BUT
pros:
– nice cockpit view(very close distance objects)  and nice look around feeling in first person view
– nice third person view too
contra:
– not realy playable, because far objects are not realy visible, close objects/planes are not that detailed as expected/wished
– problems using mouse, sometimes the mouse pointer is where? and plane stays in vertical position…
– locked to 75 fps ..why? even with all possible options set to low, never acchieved 90fps
– looking vertical down, the ground isnt moving smoove, instead its making little steps/jumps.. you see that effect if you fly near the ground

Playing WarThunder in 2D works
using Cliffhouse desktop app
– before prepare, set desktop fullHD 100 fps (i setup even 90 to match max HMD fps, but in game appeared 100 again..)
– set thunder launcher the option Vsync on (gaphic card can reach over 200fps if Vsync is off)
– steering works as like as always used to
– we can setup a virtual screen size a big as wanted and look into corner hud infos via head movement

Next try
play war thunder first person view in 2D (realistic and simulator),
using hmd movement to steer the in game first person view!
so we need to lock/disable/disconnect the hmd movement related to the virtual screen
– this works not in Cliffhouse desktop app
– this works not with App BigScreen (Steam and Windows MixedRealtiy App)
This works only with VorpX Desktop Viewer…
– pro:  it works, but you need to setup Hostas/Joystick to control the plane and use mouse for View because HMD movement is used as mouse inside the game, its not differentiated
– contra: you never can see the hud infos in the corners! you see only clear in the center, that could be better if the game could run in 4:3, or 1:1, in 1440×1440 desktop size.. i did not achieved yet, setting VorpX desktop viewer to 4:3 only squeezes the 16:9 into 4:3

best graphic quality we have in 2D Cliffhouse Desktop App (and BigScreen app, and VorpX Deskop Viewer) … when we use HMD to look around infront of the bigscreen, to see/reach even the hud information in the corners, and play input devices as used to without extra configuration…
the 2D first person option fails because of the not reachable hud information in the corners..

NEW discovered impressive new 2D version:
 i used VorpX Desktop Viewer, 
the key is the VorpX Mode: Sphere + Vertikal 90 + Horizontal 150
this spans the 16:9 Desktop as a round shape infront of us,
from left to front to right side…
as effect we see a 4:3 viewport straight infront.. and use HMD head movement to reach the sides left and right
starting war thunder in 2D…
we see nice clear view…
flying inside cockpit view is very good…
fly with hostas/joystick,
to look at wings left and right, and look around over shoulders.. i can use mouselook-button, i have configured mouse right button, press and hold this i can use mouse AND headset movement to steer the lookaround, releasing the rightmouse button goes back to looking frontside..
now i have to map that rightmouse button action (mouse lookaround)  to another button at the joystick…so that i can activat and release this HMD steered looking around feature easily..
with that now.. we can play the WarThunder Realistic Mode
and EVEN BETTER the Full Simulation mode, which only allows cockpit view for all gamers!!!
dont forget VorpX ambilight..

this concept could work in the App BigScreen too, where we can have a Sphere/curved screen in front of us.. using HMD for look around, look to left&right side..
and remember on windows, the app BigScreen is for free

UPDATE:  BigScreen kann die Leinwand fix vor den Augen halten. Option nennt sich „Move Screen“
„““To make this work, click on „Move Screen“ under Customize Screen Settings (The Screen Icon), click and hold, „Move Screen“, then drag your cursor/laser pointer away from the button. After that, just close your tablet and your screen will be locked to your head.“““

UPDATE: Desktop custom Auflösung 1080×1080 100fps nutzen um die Grafik an die quadratischen VR Displays anzupassen und die HUD Informationen besser positioniert/sichtbar zu haben.

Nachteil:  WarThunder kann offenbar bisher im Standard 2D Modus keine Headtracking Informationen des WMR Headsets benutzen.. und man muss eine extra Headtracker Lösung benutzen. Vielleicht kann Gaijin das noch nachliefern.

the Razor Gamer Smartphone is not usabel as a cabled display output device.. you can not connect it to PC and send fullHD at up to 120Hz onto this Razor smartphone.

So they missed important and new feature that makes a real gaming smartphone in new world of HMDs.

So we stick to use streaming via Wifi, and Nvidia Moonlight allows only up to 60fps…
and we dont need this expensive Razor Gaming Smartphone.

new gadget became available, so we could rethink a 2D HMD HeadMountDisplay for Flight and Car simulation… 3DOF

first new gadget is „MOGO“
https://www.cinema2go.biz/products
https://www.indiegogo.com/projects/mogo-immersive-cinematic-experience-2d-video-ar-drone-smartphone#/
its an smartphone HMD with special lenses so that we can see the smartphone display in 2D, like a  big screen.  The lenses are available itself as single item. Or we can buy the HMD with lenses already installed. 
With that MOGO HMD we can give up to build our own humble design.

next gadget is the Razor Gamer Phone
https://www.razerzone.com/mobile/razer-phone
the most spectacular feature is the 120 Hz display…
hopefully the display has low persistence too, so that video/(nvidia-)game stream(moonlight) from PC would not blur when head is turning around .. 
We will see if first hands on test will come available and discussed in more detail.

Using this two item plus a MotionCapture System for 3DOF/6DOF
we could play brilliant full HD 2D HMD.
The Razor smartphone native resolution is even better than Full HD its QuadHD 

„youtube.com/watch?v=Qrlo3Dbr7YI“