LB Tag-On battery repair flex cable for SE3
For battery repairs on the iPhone SE (3rd generation), “LB Tag-On” refers to a flexible circuit board (FPC) that is used in combination with a programmer to resolve the “Important Battery Message”. This message appears after a battery replacement, and this tag-on cable is used to transfer the battery health data from the original battery to the new one.
How the LB Tag-On flex cable works for SE3
- Purpose: The main goal of using a tag-on flex cable is to erase the “non-genuine battery” warning and restore the battery health percentage in the iPhone’s software. Without this procedure, the iPhone will display a persistent warning and remove the battery health information from the settings.
- Process: The repair is not a simple cable replacement. It requires microsoldering skills and a specialized device, such as the LB L3 or JCID programmers.
- The Battery Management System (BMS) board is removed from the original battery.
- The LB Tag-On flex cable is soldered to this original BMS board.
- This entire assembly is then connected to the new replacement battery.
- The programmer is used to write or “tag” the battery health data onto the new flex cable.
- Internal vs. External: LB and other brands offer both “built-in” and “tag-on” or “external” versions of these flex cables. The Tag-On cables are a less invasive solution that doesn’t require removing the integrated flex cable from the replacement battery, but it does add a tiny bit of bulk inside the phone.
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