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Purchase of seven (7) replacement Underwater Express battery modules. Electric Propulsion Tactical 21” Test Vehicle (EPT21TV) is a Lithium ion electric propulsion heavyweight torpedo that utilizes the... Purchase of seven (7) replacement Underwater Express battery modules. Electric Propulsion Tactical 21” Test Vehicle (EPT21TV) is a Lithium ion electric propulsion heavyweight torpedo that utilizes the original Underwater Express (UWX) batteries that were designed by Saft America. These batteries are due for replacement since they have been utilized for about 10 years and battery performance has degraded over time.