Defective Early 2011 Macbook Pro Battery & High CPU: Will A New Battery Fix This Problem?

I built a Macbook Pro 17 from early 2011 that had a wiped drive and started with the Sierra USB stick, then upgraded to High Sierra and the latest update. The battery is faulty and cannot power the machine when disconnected from the mains, the status lights on the side flash when checking the battery and show “ replace battery now ” remaining at 0% in the operating system.

The problem is that when the machine boots for the first time, the CPU is at 100% due to kernel_task monopolizing it, after some time and particularly when it resumes after sleep it drops to 0 and the macbook goes normally involves. From a reading around it seems likely that the battery is causing the problem although there are a few other possible causes, is there anything I can check that confirms the battery as the cause?

Thanks, John

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