So, should they provide Mangoose bat to Blackcaps as well?

It's not a smaller bat that they should be provided with to make them hit the ball better. It's a bigger one. Something about this size might help: a href="http://photos.thefirstpost.co.uk/ets/library/090627picoftheday--124603103781669600.jpg" rel="nofollow"http://photos.thefirstpost.co.uk/ets/…/a