Based on this product's specifications, here are some alternatives and similar models
Battery Green Cell DE93 for DELL Latitude E7440, Li‑Ion 7.4V 4500mAh, 4 cells, black
Summary description:
Rechargeable battery Green Cell DE93 designed for DELL Latitude E7440. Lithium‑Ion technology, 7.4 V nominal voltage and 4500 mAh capacity with 4 cells for reliable runtime. Supplied as a single black unit; complies with RoHS. Suitable for replacing worn original batteries to restore laptop mobility for everyday office, travel and remote work.