[XinZhao]

I first noticed it few days ago after some stormy weather. In the morning I got in the car, turned the key halfway and saw some unusual blinking, like the battery was almost dead.
I didn't turn the engine on, yet. First i checked for moist/water in the engine compartment but it was all fine and i turn the engine on with no problems.
Today I noticed the same blue lights (from ECU) blinking at some point I think after turning the engine off, then again on..
Anyone had the same issue? Is the battery close to the end? I had absolutely no problems in the winter - it was starting straight away.

I drive long distances 90% (or more) of the time

[CraigB]

Are you sure it's the engine warning light mine is orange.

[XinZhao]

No, it is not. It is just the blue background light that in FD turns on when you open the door. Also when you open the door, you can read the total number of km traveled.
I will keep eye on it, and today also will measure the voltage of the battery before first start today.

[XinZhao]

Voltage this morning was 12.56V

[sundiz]

What was the voltage when engine was on idle?

[XinZhao]

I didn't measure. But I have obd2 cheap ebay adapter and I use it with "piston" app from google play (it's free).
It goes up to 14.5.
I guess it's all fine now, because I didn't see any more symptoms.. only those two times. Maybe some water has gone where it doesn't belong.
About 2 years ago my Accu went dead after I left the indoor  passenger light on for cca 2 days. When I wanted to start the car the blue light went crazy and the starter was completely dead.
It was wintery weather - around 5-10 °C
That probably impacted the battery lifespan but as I said, in the last winter I haven't had even the slightest problem  starting the engine.

[XinZhao]

https://vid.me/iAkb

[Dazzler]

Looks like a short or a bad connection to me...