Lumia 820 / battery drain while charging

I have the Lumia 820 with the Navigon navigation app installed.  I went on a trip this past weekend and noticed a strange battery drain while driving to my destination. The drive was a little over 2 hours and I was charging the phone the whole time. I figured I would test it on the drive home. I charged the phone completely before starting the drive home. I was camping so I had to use the lighter jack in the car which is always on and charged the phone from less then 10% to 100% overnight.  Again the drive was a little over 2 hours, had the Navigon app open and running the whole time and the phone was plugged into the lighter and the charging icon was registering a charge the whole time.  The only other thing running was cellular data. NFC, Bluetooth, Wifi, Nokia Drive, all off. When I arrived home the phone was at 45% and was very hot.
I upgraded from the Samsung Focus and using the Navigon app in the same car never ever had less power when I  I ended a trip to when I started a trip.  I use the Navigon app all time so this is a real issue.  I am also going to post this on the Navigon website.
Any help would be greatly appreciated.
Thank you
Solved!
Go to Solution.

I didn't have any problem with charging the phone, but I have another problem with the battery, I noticed that sometimes my battery started to drain so fast (I mean from 100 to 10 in less than 2 hrs!!!), even when I'm not using the phone! and when I pick the phone the area on the right hand side of the rear camera (which I believe the CPU located) is warm (it's not hot but warmer than rest of the phone). I managed my background tasks, etc. but didn't work. It seems that there is bug which sometimes the OS won't release (terminate) the processes (even after closing the app). I tried turn the phone on/off but didn't work until uninstalling the last application that just installed or opened. It happened 3-4 times and the last one was today when I opened my Nokia Music. At first I thought may be it's because of the 3G usage, but even after switching to the X-Box music to stream from my Micro-SD card the battery was draining fast.

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