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OPO Not Charging and Battery Stuck at 50% After Water Damage

I entered a swimming pool with my OPO in my pocket. I immediately went and bought some rice. I wasn't able to open the back completely because I didn't have the tools to remove the SIM tray.
After a few days, I tried booting it and it showed a message that the battery was too low (pic) and then it would keep rebooting itself.
I thought that the battery was messed up, so I replaced it. Now it turns out that everything works perfectly fine (screen, speakers, camera), but the new battery (and maybe even the old one) does not seem to be charging. What's even more weird is that it will only show me that it is charged 50%.
The phone seems to recognize that it is connected to a power outlet. When turned off, I can click the Power-button once and see that it is "charging" and at 50%. When turned on, it does not appear anywhere that it is charging. No notification light, nothing on the status bar, and "50% - Not charging" in Settings>Battery (when plugged in) and "50% - approx. 12 hours" (when not plugged in). Also, in Settings>Battery>Battery optimization it says that "battery optimization not available" for Google Play Services.
I have obviously plugged the battery connector back in when I replaced the battery, but I don't know if I need to replace the Micro USB Port or not. It seems like it is recognizing when it is plugged in, but it's simply not charging.
What do you think I should do? Thank you!

Phone is off, plugged in to charger, battery is out - and when I click on the power-button it still tells me that it's charging and on 50%!?

I CAN NOT charge my smartphone Charge only off or Bootloader

I CAN NOT charge my smartphone Charge only off or
Bootloader is the way it recognizes correctly when connecting and disconnecting the usb cable
Android System Started
On with the USB Cable: Indicates the battery icon as charging but in the state of the phone "indicates you are not ****ting", so disconnect and disconnect the cable does not recognize
On without the USB Cable: Does not recognize anything, neither connect nor disconnect
Loading with the Off: load very slow; By moment turns on and off the screen and shows the logo and then the percentage of battery

same problem but solved finally
Switch off your phone/ let the battery drained to null(recommended)
Try to start your phone at 0% to drain battery.
Screen will show 0% or plug icon.
Then connect charger then , then switch on plug of charger.
After few minutes screen will show battery at 3%.
Let it charged without disturbing, it may take more time.
In my case it take 1-2 days to fully charged.
After fully charged, notification light will show on speaker, then disconnect charger and turn your phone on.
Hope this will solve your problem.
If not repeat same procedure.
***Never turn your phone on/restart while charging it may create the same problem***
If the problem not solved, uninstall or disable "charging related noise problem" system app.

Problem solved
After trying to solve the problem by placing different ROMs and until flashing the Firmware the solution was the following
As the only way to properly load the phone was by bootloader mode; Leave charging the phone that way about 5 hours lego ignited the equipment even charging and that way began normal operation the equipment

Dead GFlex2: get LG logo but no startup (or Recovery)

My LG G Flex 2 H950 was working fine, running google maps and playing music, plugged in to the car charger. Within minutes of leaving the car the phone was dead - I could not power it on. I can usually get it to show the LG logo by trying to start in Recovery Mode (holding the power and volume-down buttons for several seconds) but then the logo just disappears after a few seconds and the phone does not power on. But sometimes when I try this the red LED blinks on the phone screen and the logo may or may not appear. Sometimes (50%) when I plug the phone in to my Windows 10 desktop, the computer plays a tone to indicate a new device has been connected, but no icon appears in the list of hard drives or devices.
I think the battery is charging normally - when I connect the phone to a USB volt meter it usually (but not always) shows a normal amount of amperage flowing, and just now when I tried to start the phone it showed the battery charge icon on the phone screen (it doesn't usually do this) and showed 100% charge.
Is there anything else I can try, even if just to get the phone running long enough to backup my text messages etc?
Is there any way to test what's actually wrong? I'd hate to spend money on a new battery or charging port etc for a slim chance to temporarily fix a phone that seems like it's dying.
Thanks for any advice or suggestions...

Hey, i've got the same problem since today. i was watching youtube videos when the phone suddenly stopped working. did you already find the problem?
Sorry for my bad englisch ( Dutch)

No - not solved, phone still dead. Still would love to hear any advice...

I used to have the exact same problem as you - bootloops at the LG logo, no recovery etc. After some reading it seemed that the battery was the root of the problem, and after replacing the battery my phone was back to life - no issues ever since. I recommend you check if the battery is the issue by connecting it to a normal charger (i.e. not charging from a PC) and powering it on, by holding the power button at the battery charging screen. If it powers on normally then it's most likely a battery issue, which can be easily fixed. Cheers!

Replaced battery, now it doesn't recognize any level

Phone is Moto X 1st gen that had the original battery and was slowly dying so I bought a replacement off Amazon and swapped it out. Now it doesn't recognize any charge level to the device. I've tried a couple of those battery recalibration apps off the App Store but no luck with that (though one of them tested the battery integrity and confirmed it's not a dud). When I swapped out the old battery it was at like 18% or something so upon putting the new one in and rebooting it stuck with that 18%. I read that you could retrain it by letting it drain completely then charging full so that's what I tried next, now it reads zero.
Here's the behavior I see:
Power off device, plugged in to charger. If you push power button it will display a battery icon with a question mark in the middle
Hold down power button in this state and it still doesn't start up but the battery icon switches to the standard lightning bolt 'charging' icon but reads 0%. This number doesn't change.
Hold down power button again and it boots successfully but battery meter reads 0% - charging (actually one of the recalibrate apps I ran set it to 4% so now it says that)
How do I fix this?

Oneplus One Won't turn on

Hello I am having trouble with my Oneplus One. It won't turn on. Here are the details:
After 4 years of using, my battery could not support my phone. If I was using my battery's power, the phone would constantly reboot. So I plugged it into a power bank 24/7 in order to use the phone. It worked fine. Then, one day it would constantly reboot after the "cyanogen mod ready" screen.
Now, if I try to turn it on without it plugged in, it shows the oneplus logo and "poewred by android" screen, and reboots every 3 seconds with a vibrate. If I turn it on while plugged in, it passes the oneplus logo screen, and shows the cyanogen mod ready screen for ~10 seconds before powering off to show the battery charge percentage screen (at 100%).
I'm not sure how to fix this, but a possible solution is that I may need to replace the battery. I want to know if replacing the battery will wipe the data? I am trying to recover my photos and get my account from the LINE app. So I must be able to use the phone after. Where can I buy a working battery to replace it?
If the battery is not the issue, is there a solution to this?
Thanks so much