Based on this product's specifications, here are some alternatives and similar models
Battery Pack Lenovo IdeaPad 320 — 7.6V 3800mAh replacement battery
Summary description:
Replacement battery pack for Lenovo IdeaPad 320 with a nominal voltage of 7.6V and capacity of 3800mAh. Designed to restore mobile power for notebooks, it fits the specified IdeaPad 320 models and supports typical laptop use such as browsing, office work and media playback. Easy to install, provides reliable runtime and helps extend device usability.