Instructions of removing the DELL Precision 5520 battery

Last time we shared how to install a new DELL Precision 5520 battery, today we'd like to share how to remove a battery. This instruction is from https://www.dell.com, so this would be the correct instruction, no doubt.

NOTE: Discharge the DELL batteries as much as possible before removing from the system. This can be done by disconnecting the DELL AC adapter from the system (while the system is turned on) to allow the system to drain the DELL Precision 5520 battery.
Follow the procedures in Before Working Inside Your Computer .
Remove the Base cover
Perform the following steps to remove the DELL Precision 5520 battery:
Disconnect the DELL Precision 5520 battery cable from the system board .
Remove the seven M2x4 screws that secure the DELL Precision 5520 battery to the computer .
Lift the battery off the computer .
Do not apply pressure to the surface of the battery
Do not bend
Do not use tools of any kind to pry on or against the DELL Precision 5520 battery.

DELL Precision 5520 battery

DELL Precision 5520 battery

Brand new DELL Precision 5520 11.4V 4649mAh laptop batteries

Voltage: 11.4V

Capacity: 4649mAh (56Wh)

Battery cells: 3-cell

Chemical: Li-ion

Battery Color: Black

Condition: new original battery

Warranty: 9 months