4. Over time a battery’s ability to hold a full charge greatly diminishes. A lead battery may need to be replaced every 2 years and an optima battery may need to be replaced every 4 years. 5. If you are using or planning to use the 12-Voltair for more than 3-4 hours on a day-to-day basis adding a second battery will help in achieving optimum performance Electrical (optional) Toggle SWITCH The Voltair is designed/manufactured with the solenoid activating the pressure switch. By default, when the