Managed by a multi-phase PWM controller (such as an Intersil/Renesas or Richtek IC) driving high-side and low-side MOSFETs.
Comprehensive Repair Guide and Schematic Analysis for the Compal LA-E801P Rev 2.0 Motherboard la-e801p rev 2.0 schematic
Trace the +B line from the power connector. It goes through two protective MOSFETs (often P-channel or N-channel depending on the design). The schematic will label these as PQ... (e.g., PQ301, PQ302). Managed by a multi-phase PWM controller (such as
Disclaimer: Laptop repair requires experience with micro-soldering and diagnostic tools (multimeter, oscilloscope). Always disconnect the battery and power supply before working on the board. la-e801p rev 2.0 schematic