Battery completely dead, laptop slower than usual.

I have an Acer Aspire E15 E5-576G. Weeks ago the battery suddenly died, it had been working fine before and could hold for more than 2 hours. The charging led would be on for about 30 seconds or longer then off if I plug it in. Can't charge it whatsoever, it says "Battery not present". So I guessed I could use it without a battery, but I was wrong. Now I'm experiencing stuttering in games despite having power plan set to maximum performance and everything else. FPS dropped to half of what it was before. It's supposed to be just like before since I always plugged it in, but it's not.
I don't understand how this could happen. Does this series of laptops run worse without an active battery or something? Any help would be greatly appreciated. Thank you.

Accepted answers

Commodore_1995#

Notebook computers often use battery power, even when the power adapter is connected, when more performance is needed.

All comments

Commodore_1995#

How many years ago did you purchase the notebook ?? The lithium battery lasts for about three years. You may have to purchase a new lithium battery.

kflemonice

egydiocoelho said:

How many years ago did you purchase the notebook ?? The lithium battery lasts for about three years. You may have to purchase a new lithium battery.

I bought this in 2018. Well the battery is completely dead so yeah I'm buying a new one for sure. One thing I'm very confused about is that the notebook is slower than before the battery broke and that's mainly why I made this thread.