MacBook Pro goes slow and high temperatures after battery removal

Hi dears.

Some years ago my macbook pro Retina early 2015 had a swollen battery and we had to withdraw it. but as i was in a sanctioned county i couldn't buy an original battery and put it instead. so i kept working with it for somw years without battery.

Now I'm in Spain and i have ordered a new battery and it's not the original one (tried to be the exact one) and i hope it will fix this problem thay i have:

As you know this machines work really laggish and slower when you extract the battery. i just don't know why is it heating up so much!!! any idea??!!

And do i need to reset the SMC and stuff after putting new battery?

in 4 days I'll be updating if the new battery helps.

Thanks.

It actually worked!! I just put the new battery and it's working so much faster now! But still isn't butter fluent as it was before, could it be a graphic issue?
i mean, the grafphics are not as smooth as they were, the web pages while scrooling and ...

i also have got an extence CPU load and temp, i dont have any idea why....
here there are some screen shots