Battle was reported missing on Aug. 8 after he went swimming off a boat.
Battle and his group boated from Cottonwood Cove about 2.5 miles north to Arizona Bay on the Arizona side of Lake Mohave. A witness says Battle was swimming in deep water when he disappeared.
Earlier Tuesday, the National Park Service identified a California man who drowned at Lake Mohave. Forty-nine-year-old Matthew S. Santistevan of Rancho Santa Margarita, Calif., was visiting the lake with his wife and friends Sunday when he went missing.