Based on this product's specifications, here are some alternatives and similar models
Laptop battery t6 power for Asus X756U — 5135 mAh, 38 Wh, model NBAS0182
Summary description:
Replacement laptop battery by t6 power compatible with Asus X756U. Rated capacity 5135 mAh (38 Wh), model NBAS0182. Designed to restore mobile power to your notebook, support typical daily use and moderate workloads, and provide a direct-fit replacement for the original battery. Ideal for users needing longer unplugged runtime and simple, tool-free swap.