Inspiron 15 3521 Service Manual

Removing the 4-cell battery

1. Remove the four screws (M2x3) that secure the 4-cell battery to the palm-rest and keyboard assembly.
2. Lift the 4-cell battery along with the battery cable off the palm-rest and keyboard assembly.
3. Disconnect and remove the battery cable from the 4-cell battery.
4. Carefully push and remove the battery rubber stopper out of the bottom-left screw hole of the 4-cell battery.
   NOTE: When replacing the 4-cell battery, use a plastic scribe to push upward through the bottom-left screw hole to remove the battery rubber stopper and transfer it to the new replacement 4-cell battery.