I have a thinkpad T440p, i have replaced the CMOS because it died on me, but now after a while of getting the new one my PC is behaving weirdly, it takes three tries to turn it on. First time i turn it on and it tries to start but shuts off; the second it tries but shuts off much quicker with a strange sound that seems like the speaker suddenly disconnecting and then it works flawlessly on the third try. Is the CMOS the problem here?

maybe something physical with the power button? try setting the bios option to auto boot when ac adapter connects, and try booting that way
Thanks for suggesting this, and yeah attaching it to the AC makes it turn on fine, probably a problem with the button
wait, it only exhibits this “3 boot” problem when its on battery? If you remove the battery and just attach it to the AC adapter does it boot on first button press every time?
Yep, the issue is probably the battery, since it’s so old and in horrible conditions
it might be getting a charge with the ac and letting it boot up like normal – i would try another battery in your shoes.
Yeah the battery is barely hanging on, i believe it’s around 50-60%, i was about to replace it but i didn’t know it could cause this. Removing the battery and turning it on on AC works fine. Are the kingsener fine?