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Unfortunately No. Voltage potential is such that electric current will flow from a higher potential towards a lower potential in much the same way that water will flow from a high level to a lower level until it reaches equilibrium (balances out on both sides).
If the battery is completely discharged then a 9 Volt charger may bring the battery up to around 9 Volts but it will never go above equilibrium.
Connecting a fully charged 12 Volt battery to a 9 Volt charger will cause current to attempt to flow "backwards" into the charger. If the charger has (as many modern ones do) overload and other protection devices then the charger will simply shut down but if the charger has no such protection, it could cause permanent damage to the charger and, depending on the rate that the battery discharges, the battery could explode and one or both devices could in fact set on fire.
Electricity can be potentially very dangerous and you should always ensure that you are using the correct equipment designed for the job. If in doubt, always seek professional advice.
What else can I help you with?
How you charged the 12 volt battery?
Charge it with a 12 volt battery charger.
Can a 12 volt charger charge a 8volt battery?
No, a 12 volt charger will overcharge a 8 volt battery and destroy it.
How does a 12 volt battery charger work?
A 12 volt battery charger is designed to charge 12 volt batteries.The answer to the Related Question explains how any battery charger works.
How do you equalize a 6 volt marine battery with a 12 volt charger?
If you are asking the question, can you charge a 6 volt battery with a 12 volt charger, the answer is no.
Can you charge a 6 volt battery with a 12 volt battery charger on slow 2amp charge?
It is not recommended to charge a 6 volt battery with a 12 volt battery charger as it can damage the battery. The higher voltage can overcharge the battery and cause it to overheat. It is important to use the correct charger with the matching voltage to prevent damage to the battery.
Can you use a 6 volt battery charger to charge a 12 volt battery?
No it will not work
Can a 12 volt battery charger be used to charge a 24 volt battery?
no it can't
Can you charge a 8 Volt Battery with a 12 Volt Charger?
No you cannot.
Can you charge a 12 volt battery with a 16 volt charger?
NoNo
Can a 12 volt charger be used to charge a 8 volt battery?
No
Can you use a 12 volt charger to charge 14.4 volt battery?
It is not recommended to use a 12 volt charger to charge a 14.4 volt battery as the charger may not provide enough voltage to fully charge the battery. Using the correct voltage charger will ensure efficient and safe charging of the battery.
Can you charge a 28 volt Gill aircraft battery with a 12 volt car charger?
No, you cannot charge a 28 volt aircraft battery with a 12 volt car charger. The charger voltage needs to match the battery voltage for safe and effective charging. Using a charger with a lower voltage can damage the battery and pose safety risks.
