Water Spilled Condition: Laptop turning off while unplugged

I have a Lenovo T450s, age: 7 months. It has two 3-cell batteries, one integrated, one removable. The day before yesterday, my mom spilled a glass of water accidentally on the laptop. And my instant reactions were:

1. Unplugging the power cable
2. Pressing the power button for 10 seconds
3. Keeping the laptop in a controlled environment (30°C) so the evaporation happens fast
4. Keeping it in a windy environment (to move off the water vapors & faster evaporation)
5. Taking this to service center 12 hours later only to drywash the machine, but didn't provide them removable battery or power cable (so that they cant turn the laptop on even if they've wanted to. I didn't want anyone to turn on my soaked laptop and burn all the circuits which had been shorted because of water-connectivity (i dont think this term exist))

After that, when I've turned on my laptop, I had to input my clock data (date, time etc) in BIOS settings. (This information may be of some values to the experts)

Now the Laptop is running quiet fine, except for 4 of my keys (F12, windows, Print Screen and Right Arrow) are not working. I doubt this credit goes only to the fine gentlemen in service center, because my trackpoint, extra mouse-buttons are not working too. But that's not the problem I expecting solution from this forum. The major problem is the battery.

When I remove my power cable, the laptop turns off instantly. I've read over a hundred forum in thousands of sites and the maximum post have got a response like "What do you mean by instantly?" or "Your battery is damaged, son, go buy another one."

I'd be seriously offended if anyone points a finger to my batteries, accuse both of them to be damaged and tell me to buy one/two. Because, this laptop was bought in Minneapolis, US by my brother February this year and sent over to me (to Bangladesh) later that month. The laptop including its batteries are very new, T450s is not some old model (I'm considering manufacture to sell delay too) and this only leaves the option water spilling incident.

And I want to repeat, yes,

• I DID unplug my power cable and removable battery instantly after the spill.
• I don't know about the integrated one (Battery 1), but my removable 3-cell battery (Battery 2) is as good as new, that I can assure you. Because, It was dry when I pulled it out from my laptop ( a moment after the spill)

So, this is a unique problem, but I hope nobody accuse my batteries, as I'm sure as hell one of my 3-cell battery is in a pretty much good-working-condition. It wasn't even soaked in that incident. I think of some possibilities now.

1. Some kind of system glitch. Because after reassembling the laptop in service center, I had to input the date and time before startup. (pressed F1 to go to BIOS settings)
2. Some kind of contact interrupt. Battery connection may not be satisfactory.
3. The battery is gone (inner one). And the secondary battery (removable) can not provide power if the primary one is faulty (Showing 100% charge and providing dog's sheet (don't misjudge the spelling). So the 2nd battery may get the signal battery no 1 is working. Wait for it to be drained off, then go to action. But its already drained off and thus though having 2nd battery intact, my laptop is turning off instantly when the power cable is taken off.

Instantly means
Instantly means both acts happened in the fraction of second.
1. I pull my power cord,
2. The laptop turns itself off
Both happens simultaneously.
Turns off means
Turns off doesn't mean black screen. I didn't mention any screen going black. Mentioning screen going back refers to a display situation, not a battery situation. I'm accurately saying "the power goes off, laptop turns off. Shuts down."
3 could-have-been-happened mentioned above
Those are my hypothesis only. I think they might be some possibilities. Of course I'm waiting for an expert for helping me.

Thank you.

My Specs:
Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows 10 Home, 64 bit
Processor: Intel(R) Core(TM) i5-5300U CPU @ 2.30GHz, Intel64 Family 6 Model 61 Stepping 4
Processor Count: 4
RAM: 12167 Mb
Graphics Card: Intel(R) HD Graphics 5500, 1024 Mb
Hard Drives: C: Total - 240951 MB, Free - 113765 MB; R: Total - 234709 MB, Free - 12057 MB;
Motherboard: LENOVO, 20BXCTO1WW
Antivirus: Windows Defender, Disabled