My laptop lags when I plug it in, and the battery doesn't go up

[AlonsoCGA]

I turned on my laptop when I realised how slow it was going. I turned it off and restarted it a couple times but it just didn't go any faster. Then, I saw that my battery wasn't going up, it only stayed still at 64%. I unplugged it and immediately my laptop started working normally, but the second I plug it in it gets super slow and the battery doesn't go up. Can someone please help?

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