Bates then dominated the White Ferns run chase with a boundary-laden 50. After the run out first ball of fellow opener Samantha Curtis, Bates got stuck into the gentle West Indies attack, hitting two fours and two sixes in her entertaining knock.
Sara McGlashan finished 32 not out as the White Ferns won by 8 wickets in the 16th over.
Yesterday the White Ferns batted first and found it difficult to accelerate the innings on the easy-paced pitch. Bates again led from the front, notching up 57 off 51 balls with four boundaries as the White Ferns made 124-5 off their allotted 20 overs.
West Indies struggled in their reply and were all out for 90 in the final over, with Sophie Devine taking 3/9 and Frances Mackay 2/13.
Both teams fly out to Bangladesh this week to compete in the Twenty20 World Cup.
International Women's Twenty20
Yesterday: White Ferns 124/5 (Suzie Bates 57, Sara McGlashan 30) defeated West Indies 90 ( Sophie Devine 3/9, Frances Mackay 2/13).
Saturday: West Indies 99/7 (Shemaine Campbelle 29: Morna Nielsen 2/8, Suzie Bates 2/12) lost to White Ferns 103/2 (Suzie Bates 50, Sara McGlashan 32no).