You need to have your 12V batteries charged. This R86045 is a backup for when one charger isn't enough. It has the standard features of a lithium ion battery charger like a fuel gauge and lengthy power cable, but builds upon them with unparalleled charging power for those in its class. It can fully load its compatible batteries (AC82048, AC82058, and AC820589) in as little as 30 minutes, leaving you plenty of extra time to get the jobs you need done fast with your drills or impact drivers. Keep it mounted in your utility truck, garage, basement, or other jobsite to have on hand when you need it with the onboard mounting brackets found on the back of the unit. Whether you need a fast recharge on-the-go or want a reliable charger to have around the workshop, the R86045 from Ridgid is the way to go.