I bought a 18V Milwaukee and like it but it will go through a 5 amp hour battery rather quickly with a wool pad on it.. I own a ton of Milwaukee 18V tools so i have plenty of batteries so it is not that big of a deal for me. Not having a cord to have over your shoulder is a big advantage in my opinion.
And i agree to all the above about proper technique when polishing. Ask me how i know!
https://www.milwaukeetool.com/Produc...ishers/2738-20