Hi @Amaury_Palao,
Glad you got the new battery. The battery they sent you likely is not charged. So it will result in the same thing initially as the dead battery you removed.
Leave the laptop plugged in overnight so that the charger can bring up the voltage on the ML1220 battery. It needs to have a minimum charge level in order to function properly in that circuit.
You may need to press and hold the power button for more than 20 seconds a few times to get it to fully shutdown the EC and have it start clean. If it is still an issues, resetting the mainboard like what @anon81945988 said may be the next step.