Battery compartment FLEX

Customer came in for battery replacement. Had this small chip attached to the iPhone 11 battery flex. What is this? All the years I've done this I've never seen one. : r/mobilerepair

Tool Storage - Pegboard Mounted Dewalt Flex Volt 20v/60v Battery Holder

Lenovo FLEX 3-1120-20551 Battery

Lenovo FLEX 4-1480-80VD Battery

Model : L15M3PB0 // Voltage: 11.25V // Capacity: 52.5Wh 4670mAh // Color: Black // Type: Plug & Play Li-ion Battery. Replacement for Part Number

JIAZIJIA L15M3PB0 Battery Replacement for Lenovo Flex 5 1470 1570 IdeaPad 320S-15ABR 320S-14IKB 320S-15AST 320S-15IKB 320S-15ISK 520S-14IKB Yoga

Lenovo FLEX 6-14ARR-81HA Battery Replacement

Green Essence :: BYD Battery-BOX LV FLEX Lite

STACK PACK™ BATTERY HOLDER

Lenovo FLEX 2 (14 inch) Battery

Flexing battery holders with integrated spring by enif - Thingiverse