* The new battery is not properly connected. Make sure that the positive and negative terminals of the battery are correctly connected to the corresponding terminals on the vehicle.
* The new battery is not properly charged. A new battery should be fully charged before it is installed in a vehicle. If the battery is not fully charged, it will not be able to provide enough power to the vehicle's electrical system, and the battery light will come on.
* The new battery is not the correct size or type for your vehicle. Make sure that the new battery is the correct size and type for your vehicle. If the battery is too small, it will not be able to provide enough power to the vehicle's electrical system, and the battery light will come on. If the battery is too large, it may not fit properly in the battery compartment, and it may cause damage to the vehicle's electrical system.
* There is a problem with the vehicle's electrical system. If the battery light comes on after you install a new battery, it is possible that there is a problem with the vehicle's electrical system. This could be a problem with the alternator, the starter, or the wiring. If you are not sure what the problem is, you should take your vehicle to a qualified mechanic for diagnosis and repair.
