Running MacOS 15.1 on Late 2008 MacBook, cant fix battery problem

I bought it for 40 euros, added a Kingston SSD and I am dual booting it with Success' href='/2020/12/install-macos-mojave-on-supported-pc.html'>Mojave and the latest MacOS 15.1, but becuse the battery is not in the laptop its so slow. I tried to enable the setting(Disable Firmware trottling)in OpenCore but every time I do it and rebuild and install OpenCore its reverts to being disabled.

Author: @Neither-Break4008