uniden used to make a cradle charger to plug the proprietery battery pack into to charge extra batteries, your original walwart plugs into charger and charger has a pigtail to plug into scanner to charge or run both simultaniously. I think it came with another battery pack, only about 800mah but a spare none the less. check scanner master,scanner world, communications electronics, one of those places should have one if still available. I used one for my sportcat 200 with ni cad and nimh 2200mah batteries, worked well.