Top management at Motorola supported Cooper's mobile phone concept, investing $100 million between 1973 and 1993 before any revenues were realized. Cooper assembled a team that designed and assembled a product in less than 90 days. That original handset, called the DynaTAC 8000x (DYNamic Adaptive Total Area Coverage) weighed 2.5 pounds (1.1 kg), measured 10 inches (25 cm) long and was dubbed "the brick" or "the shoe" phone. A very substantial part of the DynaTAC was the battery, which weighed four to five times more than a modern cell phone. The phone had only 30 minutes of talk time before requiring a 10-hour recharge but according to Cooper, "The battery lifetime wasn't really a problem because you couldn't hold that phone up for that long!" By 1983 and after four iterations, the handset was reduced to half its original weight.