Rovman Powell cracked a rollicking 28-ball 61 as West Indies' 193-5 proved too much for Bangladesh to chase down in their second Twenty20 international.
Bangladesh scored 158-6 in reply as West Indies won by a comfortable 35 runs to take a 1-0 lead in the three-match series.
Opener Brandon King scored 57 runs in 43 deliveries and captain Nicholas Pooran hit a 30-ball 34 after West Indies chose to bat first on Sunday.
Left-arm pacer Shoriful Islam took 2-40 in four overs.
Bangladesh recovered from 23-3 as Shakib Al Hasan top-scored for the visitors with an undefeated 68 off 52 deliveries, including five fours and three sixes. It was the highest score of the match.
Pacer Romario Shepherd finished with 2-28 in four overs.
"The platform was already set by captain and Brandon and I think they played well before I got to the crease so it was just an opportunity for me to advance the score and bat all overs and I think I did that today," said Powell after the game on Sunday (July 3).
"I think it's a pretty good wicket. It's a very good wicket, especially for batting and you just see five or so balls and get yourself in and then the ball just coming on to the bat and you express yourself as a batsman," he added.
Powell also added that he now feels he has grown as a cricketer, and as a result, there is a change in his mindset as far as his batting is concerned.
"In anything you do, especially in professional sport, growth is a very important part and you have to grow from skill perspective to mental perspective and in each part I think I am growing and hopefully continue to learn.
"To be honest I stopped looking at myself as a big hitter. I start looking at myself as a batsman with power and with that comes control... know when to look for a single and know when to attack I think that served me well so far," he said, whose innings was decorated with six sixes and two fours. He picked 23 runs off a Shakib al Hasan over that was the switch in momentum that West Indies were looking for.
The first T20 on Saturday was a washout. Bangladesh reached 105-8 in 13 overs with the match already having been reduced to 14 overs per side. That game was the first cricket international at Windsor Park since it was rebuilt after being severely damaged in 2017 by a hurricane.
The third and last T20 is scheduled for Thursday in Providence, Guyana, followed by a three-match ODI series.
West Indies swept the two-match test series against Bangladesh.