Remove the battery.

Never reinstall a damaged or deformed battery. Replace the battery.

To reinstall the battery, orient it such that the wires exit near the bottom towards the motherboard side.

To help with alignment, connect the battery temporarily to the motherboard before adhering it in place. Disconnect the battery before you continue with re-assembly.

Clean off any adhesive residue which may prevent the battery from sitting flush against the frame. Use a few strips of adhesive included in the battery kit or some double-sided tape to secure the battery to the frame.