cellePhone Battery Li-Ion for Nokia Lumia 640 XL (replaced BV-T4B) | cellePhone mobile generation
Amazon.com: Lasting Power 3300mAh BV-T4B Standard Battery for Microsoft Nokia Lumia 640 XL Windows Smartphone with Additional Valueable Accessory (See Picture) : Cell Phones & Accessories
Microsoft Lumia 640 LTE Battery Replacement - iFixit Repair Guide