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In this episode of the DC Power Hour David and Allen introduce Ed Rafter, a special guest on DC Power Hour, who is an expert in UPS batteries. They discuss the differences between ups and downs, voltage, discharge times, and other aspects of battery powering. Ed has a 40-year career in mission-critical applications, focusing on batteries. He first learned about batteries in the 1980s when he worked for an engineering firm in New Jersey and then worked for data centers for the New York and American Stock Exchange and securities industry. Allen shares his experience installing dry charge batteries in Saudi Arabia in the late 70s.