A field technician is assigned to replace a degraded internal lithium-ion battery inside a corporate ultrabook. Arrange the following diagnostic and service steps in the correct chronological order from first step to last step.
- 1Perform a complete operating system shutdown and disconnect the external AC power adapter.
- 2Unscrew the bottom chassis fasteners and carefully detach the lower housing panel.
- 3Disconnect the battery cable harness from the motherboard header connector.
- 4Remove the battery retaining screws and extract the old battery pack from the chassis frame.
- 5Seat the new battery, secure its screws, reconnect the motherboard cable, reassemble the chassis, and plug in AC power to charge.
Answer
The correct sequence from first to last is: Disconnect AC power and shut down OS -> Remove bottom chassis panel -> Disconnect battery header from motherboard -> Remove battery screws and extract old pack -> Install new battery, reconnect motherboard header, close chassis, and connect AC power.
The correct sequence strictly follows standard technician safety and hardware disassembly guidelines. External power must be isolated and the system shut down before opening the case. Once opened, disconnecting the battery electrical header from the motherboard immediately de-energizes internal components. Only after de-energizing the board should metal tools be used to unfasten the battery retention screws to remove the pack. Finally, the new unit is physically secured, re-energized via motherboard connection, encased in the chassis, and connected to AC power.
Step-by-Step Solution
Key Concept
Internal Laptop Battery Replacement and ESD/Electrical Safety Procedure