FAQ Search Select a Category Cleaning Formulas Cleaning Tips Corporate Deep Cleaners FAQ Hard Floor Cleaners Parts and Accessories Steam Sweepers Vacuums Warranty Web Site and/or go General Information about my Lift Off 2-in-1 Lift Off Cyclonic 1189 Vacuum. Answer: Run time on a full battery charge – up to 21 minutes. The unit must charge for 12 hours prior to FIRST use. Once charge is depleted, only 6 hours of charging time is needed to regain full charged capacity There are two brush rolls that come with this machine that can be easily changed to optimize cleaning on different floor types. Use the Multi-Surface brush roll for general cleaning on hard floor and area rugs, or switch to the hard floor brush roll for improved cleaning on hard floor surfaces. Model number and serial number of machine is located on back of handle of the machine. There is a white sticker on the bottom of the charging base (see picture below). This only tells who made the machine, and caution statements. This sticker does not have the model number or a serial number on it. To dispose of battery, Make sure the unit is removed from the charging base. Remove the hand vac from the unit. Squeeze the two battery release buttons to release the battery pack and lift straight up and out of the hand vac. DO NOT separate in individual batteries. For specific disposal instructions of batteries, please contact RBRC (Rechargeable Battery Recycling Corporation) 1-800-822-8837 or visit www.rbrc.com .