I had a new battery installed about a year ago, by the way.

My software is updated and I have cleared the cache, which didn’t improve my internet speed just now. It was close to 200 mpbs this morning and down to 30 just now. I had my IT guy come out yesterday to check everything and determined the problem is my computer.
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I have never seen one’s computer internet speed at all correlated to the battery. Your internet is either good or bad and the speed is in no way tied to how much battery power the laptop or iPad has. It would be the exact same as saying "my phone only has one bar because my battery is about to die.” The two are not tied.

Now it is very likely that the computer is overheating for another reason and if it’s a Chinese battery, carry a fire extinguisher around because I’ve seen that exact behavior in poor quality batteries many many times.

I’m happy to do what I can to assess your situation further remotely via zoom or in person. Feel free to schedule either at the link below.