[Android Head-Units] Acuauto:
Hey, new to the forum and retrofitting in general in the tech world. Just recent taught myself how to solder and bought a nice Hakko soldering station and have had great success with replacing some old electronic components so it's safe to say that the DIY bug has latched on. I am a long time car enthusiast and really enjoy getting things exactly how I envision them.

I have been wanting to install a navigation/ android auto unit in my '90s Acura for a while now but due to my strong distaste for the aftermarket unit overall looks, cheesy functions and the cheap feeling buttons and lack of volume knob, I haven't been impressed enough to ditch the OEM radio yet. I prefer the OEM look and functionality but recently would like to change it up a bit.

I have an old LG G5 phone that was laying around and it occurred to me: Nexus 7 tablet installs were pretty common and most turned out nicely done, at least in the 04-08 Acura TL's that I have seen. What if instead, I used my G5? It's the perfect 5.5" 16:9 aspect ratio display for the Honda Navi bezel I will use, has plenty of processing power for the tasks I need it to do and is something I already have in hand. Initially I wanted to root the phone and install Timur and such like on the Nexus 7's to fully take control of the phone but I learned on here that my Sprint G5 isn't rootable. Not a huge deal since I technically will only use the phone for android auto/ navi/ pandora apps and route it's audio into the stock head unit, so I am not relying on the device itself as the main head unit and could wait the minute or two it take to fully boot up before using it for navigation and music.

I figure I could leave the phone intact (I think it has to be for the wifi antenna to work) and permanently mounted in the dash behind a 2nd gen Honda Odyssey Navigation bezel with the LG power button rerouted to the Honda bezel "push to select" toggle switch for controlling the LGs lock/unlock screen and power functions and then the LGs volume controls rerouted to the Honda navigation "zoom in" and "zoom out" buttons for the LG volume up/down controls for a functional and OEM look. I can reprint the buttons on the Honda bezel to read accordingly to their function.

I even found an app called Automate that I think can pretty much get some functions Timur would provide on the phone, like a delayed deep sleep power saving mode whenever charging stops/ power is disconnected from the phone (car ignition off) to preserve battery even longer and a few other things but I haven't messed with the app yet to test it out. But that essentially that would make the phone last a little longer with the car parked for long periods of time so that a long boot up isn't required, though a small inconvenience.

Then I started to think about the Lithium Polymer battery, how it will be affected in the summer heat, winter cold, and being constantly charged and discharging. Realizing the battery isn't stable above 140 degrees F and with summer interior temps in my car probably reaching 180+ degrees F in direct sun, I am looking for an alternative power supply that can cope with the elements and remain stable to avoid my car being burned down. It looks like Lithium Ions are a little more stable, but not enough for for the application.

Does anyone have any long term experience with in car tablet installs with climates that get very hot and very cold? I am considering bypassing the battery all together and hard wiring a 3.8V-4.0V 2amp power supply to the phone, but then I also read where LG batteries use some sort of DRM that could prevent the phone from staying powered on when not detected. Not sure if that applies to the LG G5, I currently have an aftermarket 3,600mah battery in it that has been powered on for 2 days straight now without any issues (and is only down to 40% charge left!) so unless this battery has a DRM that matches my phone, or the G5 doesn't have DRM at all, idk. I can't find any information regarding DRM besides for the G4 I think.

If I went the hard wired route I would still not want to deal with the phone constantly rebooting with every restart while out in town going to different shops and I don't know how the software will handle the sudden power loss over a long period either. Some sort of battery seems like it is needed to supply some charge for about an hour or so with the ignition off to let the phone sleep and shut down while away, or for it just wake up and start charging again once the ignition is turned back on.

Any recommendations?

Here is how the set up looks:View attachment 5237267