To be made in low quantities with fine attention to detail, flavor, and source of ingredients and/or materials. Presumably, batchy things are high-quality, premium and expensive. Frequently, batchy things are handmade or homemade.
"Check out the hand-written number label on this batchy bottle of bourbon I just picked up from the fancy liquor store! It was aged in sherry casks!" "I'm wearing this beautiful, batchy lavender/thyme perfume that I got at the farmers market. Look at the cute, hand-blown, glass bottle and the label made of vintage Sicilian postage stamps!"