High CPU usage when running on battery power

Hi all,
Since a a few weeks, my MBP mod A1278 with the i5 CPU, is extremely slow when not plugged in.
The Activity Monitor shows that a kernel_task is consuming 274% CPU and is using 64 threads.
As soon as I hookup the power adapter,  the kernel_task activity falls back to around 3% and everything is all good.
Anyone with a solution? Should I replace the battery?
BTW I completely reinstalled the MBP and I have a clean system.
Thanks.
Patries,

Click Apple icon on the Menubar.
From the dropdown click About This Mac.
Click More Info.
From the popup window select System Report and click Power on the side bar.
It will show the health of the battery.
Proceed from there.
Best.

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