Why is my temperature so high on my MacBook Pro Retina?

Hey everyone,

So about a month ago I replaced my late-2013 macbook pro’s battery with a kit from ifixit itself. That went without issue and the batteries work well.

However, afterwards my computer started lagging significantly when i started running more than like 3 tabs on my laptop, something that never happened before with both fans ROARING. For reference, my laptop is i7 2.3 Ghz 8GB RAM. Though its getting old, I feel as though these specs should definitely be able to support running more than 3 tabs at once, especially since it did so before the battery replacement.

Recently, I decided to (randomly) check my laptop’s internal temperature and its SO high. I downloaded an app to check it and I’ve attached an image to the post. My average computer temp is 123 F and 180 for the CPU temp. This is obviously way too high. I took the temp when I was running 3 tabs on my computer and literally nothing else.

Thoughts on this? is this a malfunctioning temperature sensor. I ran the Apple Hardware Test and all I got back was an error code for the battery which I guess would be expected since I replaced it (with an apple-specific OEM battery), and the battery runs otherwise fine with normal longevity.

Thoughts? Any help is appreciated. Thanks