CPU is throttling with new battery
I've recently replaced the battery in my Macbook Pro and the battery itself works fine, holding a charge for about 5-6 hours, but I've noticed much slower CPU performance and used Intel power gadget to check, realising the processor was locked to 1.4GHz. I cannot check AHT Diagnostics since I've updated the Macbook to Monterey using OCLP, and my original battery is basically dead so going back to that isn't an option either, like the other thread said. Also just to add, I've checked activity monitor and I don't have a kernel task going nuts either - everything seems normal.
So does anyone know of a solution to this? Or does Apple just expect me to pay their exorbitant prices to get the battery replaced?