The slave ship Alerta S João Batista left the African coast carrying enslaved Africans toward Brazil. About 273 people had been taken aboard.

Vessel: Alerta S João Batista; flag: Portugal / Brazil; rig: Brig. People recorded in connection with the voyage: Investor: Pereira, José Antônio; Captain: Camacho, Manoel Marques; Investor: Camacho, Manoel Marques. The voyage began at Pernambuco, place unspecified on 13 February 1803. Principal recorded place where captives were acquired: São Tomé (Bight of Biafra and Gulf of Guinea islands). Principal recorded disembarkation place: Pernambuco, place unspecified. Recorded outcome: Bought at least one slave in Africa - subsequent fate unknown.