No, if a piece of electronics is marked as "AC adapter 12V" but also "Battery 9V," it does not mean that you can safely use a 9V AC adapter to power it. The information provided on the device typically refers to two different power sources:
AC Adapter 12V: This means the device is designed to be powered by an AC adapter that provides a voltage of 12 volts. An AC adapter converts alternating current (AC) from a wall outlet into the required direct current (DC) voltage to operate the electronic device.
Battery 9V: This indicates that the device can also be powered by a 9V battery. The device likely has a battery compartment or a built-in battery holder to accommodate a 9V battery for portable or backup power.
Using a 9V AC adapter instead of the specified 12V AC adapter could result in various issues:
Insufficient Power: The device may not receive enough power to function correctly, leading to performance problems or failure to operate.
Potential Damage: Using an AC adapter with the wrong voltage can potentially damage the device's internal components due to overvoltage.
Safety Concerns: There could be safety risks, such as overheating or electrical hazards, when using an incompatible AC adapter.
To ensure the safe and proper operation of the electronic device, always use the AC adapter with the specified voltage (in this case, 12V) as indicated on the device's label or in its user manual. If you don't have the correct AC adapter, contact the manufacturer to purchase a compatible one or look for a universal AC adapter with selectable voltage settings that includes the required 12V output option. Alternatively, you can continue using the device with the appropriate 9V battery, if applicable.