does anyone know of any battery adapters that will let me use porter cable pc1800 18 volt batteries in an 18 volt harbor freight 68850 drill? i have set of harbor freight tools and a set of harbor freight tools and i can get the porter cable batteries but not the harbor freight batteries so if i can get an adapter to use the porter cable batteries in the harbor freight tools i will again be able to use those tools. it seems the porter cable pc1800 drills just are not holding up as good as the harbor freight drills do but i can't get the harbor freight batteries anymore so that is why i switched. thanks