The Premier Mobile Electric Lift Table utilizes rechargeable batteries to enable raising and lowering the table without having to be plugged into a power outlet at all times. Over draining these batteries will inhibit their ability to fully recharge, so it is very important to keep the batteries charged. Keep the table plugged in and in charging mode when not in use. To Charge Batteries: To charge batteries, plug the table into a standard power outlet. Charge the table every night, overnight, and more frequently if the table is being used continuously throughout the day without being plugged in. The table needs to be unplugged for normal use.