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Battery board flex cable: compatible with MacBook Pro 16 inch A2485 and A2780 from 2021 for M1 and M2 versions. Restores the link between battery board and logic board during service, suitable for DIY and bench repair. Replacement cable: OEM 821-03122-A for accurate interface alignment. Flexible FPC structure supports precise seating and steady contact after prior ribbon damage, wear, or removal in device maintenance. Repair accessory: polyimide and copper FPC with slim profile routes cleanly in the chassis. Black finish blends with the battery bay layout and supports consistent signal transfer when reassembling the device. Functional use: replace torn, creased, or missing ribbon to resolve connection interruptions between the battery board and logic board. Suited for home workbench, office IT upkeep, school fleets, and repair centers. Install guidance: power off and disconnect the battery before service. Use ESD protection and apply even pressure on connectors. Package includes 1 cable only, select by model numbers before ordering or scheduling work.