How can I fix kernel task from using 300% of my CPU?

Everytime I disconnect my MacBook Pro from the wall, Kernel Task uses 300% or more of my CPU and stays that way until I connect the power. I've tryed resetting the System Management Controller, restarting the computer, logging in to another account, and deleted all "bad" files (problem files I've found out via Google). Going to Safe Mode does remove this problem, so it's maybe a program error?

The most likely reason for it is that the battery needs to be replaced.

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    When it gets high temperature readings from the hardware, or a low-voltage reading from the battery, the kernel may try to compensate by interrupting the processor(s) to slow them down and reduce power consumption. This condition can be due to
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    Apple Diagnostics or the Apple Hardware Test, though not very reliable, is sometimes able to detect a fault. For more thorough hardware testing, make a "Genius" appointment at an Apple Store, or go to another authorized service provider.
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    Installed software
    User-installed software that includes a device driver or other kernel code may thrash the kernel. That category includes virtualization software, such as Parallels and VMware, as well as most commercial "anti-virus" products. Some system-monitoring applications, such as "iStat," can also contribute to the problem. You can test for this possibility by completely disabling or removing the software according to the developer's instructions, or starting in safe mode. Note, however, that disabling a system modification without removing it or testing in safe mode may not be as easy as you think.
    Corrupt NVRAM or SMC data
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    External display
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