Faulty UK USB Power Brick/Wall Charger Drains iPhone Battery

I'm writing this post more from an informative perspective, rather than from a question seeking a response.
I have a genuine Apple UK USB wall charger which is at least 2 years old - it either came with my current iPhone 5 or old iPhone 4 from 4 years ago (both look identical).
Recently on charging my phone overnight, I've woken up (late - as the alarm consequently didn't work) to find that the power had drained from my phone rather than the expected charge happening. Having an old phone, I assumed it was the fault of the phone and booked it in for a genius bar visit. Being annoyed about the 1 week+ delay for the next genius bar appointment, I purchased a new iPhone to use temporarily for a week which would then be returned for a full refund on receipt of a replacement for mine.
On testing out the brand new iPhone with the charger, it appears that the same happens:
On plugging in the new phone to the charger once it has been fully charged (100%), within 5 minutes the charge in the phone has become 97%.
I'm guessing it is quite unusual for a USB brick to fail in this way - to actually drain the phone of charge?

I have the dock connector option for my factory stereo as well and am also seeing it drain the iPhone battery. What's odd is that it used to charge just fine.
Initially the iPhone wouldn't route audio through the dock connector in my vehicle. It would see that it was plugged in and gave the Airplane Mode prompt, but would only play audio from its internal speaker. It did, however, charge as expected. Then the iPhone software update 1.0.1 came out which solved the audio issue and allowed me to get the audio to my deck properly. I can't say for sure if it was still charging the iPhone at that point, but it definitely wasn't /draining/ it. Then, right around the time of the 1.0.2 update I started to notice significant drops in battery power when unplugging it after a drive to or from work (usually around 25 minutes). The audio still works fine, but the battery seems to drop at least 15-20% over that drive, whether I have any music playing or just have the iPhone idle but plugged in.
So, software problem, maybe? I have a hard time believing something suggendly changed with the dock connector in my vehicle...

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Ingo2711 wrote:
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