Based on this product's specifications, here are some alternatives and similar models
Battery t6 power for Acer Aspire One 725/756 — 2600mAh, 38.5Wh, MPN NBAC0076
Summary description:
Replacement laptop battery by t6 power compatible with Acer Aspire One models 725 and 756. Capacity 2600mAh and energy rating 38.5Wh (MPN NBAC0076) provide portable power for everyday mobile use. Designed for easy swap-in installation to restore run time for browsing, document work and light multimedia on the specified netbook models.