MacBook struggling

My five year old MacBook Pro is using 500% of the processor and the battery isn’t charging any more is it too much for it and ready to blow? I have a external ssd I’m using for chia .

I tried to use external NVMe over USB and the battery stopped charging as it was drawing too much power. I used a powered USB hub which fixed the battery issue.

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What does a powered usb do? How much are they and where can I get one ? Best Buy?

Did that slow down your processor from working so hard ?