Craftsman Bolt-On &trade; 20 Volt Max* QuickBoost&reg; Lithium Ion Charger (Bulk Packaged) Bolt-On Battery Charger delivers the perfect current for your 20 Volt Max battery Quickboost charge function fills an empty battery to 30% in just 10 minutes Delivers a full capacity charge in only 30 minutes Cord Wrap feature allows for easy storage and transport To be used to charge the Craftsman Bolt-On  20 Volt Max Lithium Ion Battery (Sears Item #0091648