Choice for Filtering Battery Voltage

I would like to ask for the option to have a digital filter for the battery Voltage, since the value is usually spiky, we get a lot of Injector Cal correction irregularity. And you see the final calculated Injector Pulse Width is shaking as well because of the Injector Cal compensation. I like the Battery Voltage to be raw sometimes because i can detect power delivery problems without having to use an osciloscope, but after that, dialing in the Injector Cal, i really have to flatten out the range from 12.5 to 14volts because of the spiky nature of the Battery Voltage value Ecumaster sees