Kernel_task 336% usage and Battery wont charge (MacBook Air 2012medio 11")

Hi Apple fans.
I've a one year old MacBook Air, 2012 Medio 11" 1.7ghz Intel Core 5, 4GB ram, Intel Graphics 4000 - and Mountoun Lion installed.
The problem is, that its awfully slow. It startet last week, where I bootet up normally, and saw the Battery didnt't charged (x as battery indicator). And even worse the general state of the machine is VERY slow. Everything is working with severe lagging - even just typing in Safari browser... like you type GOOGLE.COM and it enters it after nearly 20 sec.
I've narrow it through Activity Monitor to KERNEL_TASK using 336% usage (dont ask why its not 100% ;-). Rendering it absolutly uselsess. The Screen is darkend, behaps because the Kernel is taking on all CPU usage, rendering nothing left so maybe the MacBook Air auto goes into this mode, for protecting. The fan is not hammering, so it appears to work fine.
I've tried Once doing the SMC reset. It actually worked seeing the battery getting charged. But next day same problem, and now the trick of SMC wont work again!.
What to do?
I havent tried NVRAM reset or even SAFE MODE (that is my trick for tomorrow), but are there any order you should do this (ex. Safe Mode first, then SMC reset, then NVRAM reset)? Do you have to do a SMC reset several times before it works?
Hope anybody can help me out?
Regards, Thomas

Make a "Genius" appointment at an Apple Store, or go to another authorized service center.
Back up all data on the internal drive(s) before you hand over your computer to anyone. If privacy is a concern, erase the data partition(s) with the option to write zeros* (do this only if you have at least two complete, independent backups, and you know how to restore to an empty drive from any of them.) Don’t erase the recovery partition, if present.
Keeping your confidential data secure during hardware repair
*An SSD doesn't need to be zeroed.

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