Battery for Samsung Galaxy A40 Li-Ion Replacement Battery with 3020 mAh - Samsung Original Accessory Including Display Pad: Amazon.de: Electronics & Photo
Replacement Battery For Samsung Galaxy A40 A405f Eb-ba405abe Eb-ba405abu Rechargeable Phone Battery 3100mah - Mobile Phone Batteries - AliExpress
Battery EB-BA405ABE compatible with Samsung A405F/DS Galaxy A40, (Li-Polymer, 3.85 V, 3100 mAh, Original (PRC)) - All Spares