No. The amperage isn't high enough for you to be harmed by it.
No, across the tongue it can't kill you. If someone opened up your chest and put the battery across your heart then you might be in trouble...
Possible. If you have a heart condition, pace maker, etc. then there could be problems any electrical voltage no matter how minor. Also, if the battery touches a nerve close to the surface of your tongue, it can cause other issues.
On top of that, not all batteries are made to specs, just ask Sony. With manufactures farming out to other vendors, they loose track of quality control. A battery that is not to spec will provide the jolt to seriously injure someone.
No. The voltage is not high enough to cause real harm, and the battery cannot supply enough current to do harm.
This is not advised! The 9-volt charger might have a current limiter so that nothing burns up, but it any case if left on it will destroy the 6 volt battery by overcharging. A 6-volt charger is not expensive.
The voltage is unknown, because it depends on the impedance of each battery. Certainly, damage is going to be done, because there will be excessive current.
To charge a battery, the charger voltage must be higher than the battery voltage. If a AA battery (or any other) has a normal voltage of 1.2V the charger voltage must be at least 1.2V. The type of voltage supply and its current capability is immaterial. No, the charging voltage have to be larger than the battery voltage, to charge 2 AA batteries, that is 3 volt if connected in series, so a voltage of at least 4 volt is needed
Shouldn't be a problem. For example the unloaded voltage on a car battery is often around 14 Volts. Under load the voltage reduces.
The Volt
No, you cannot charge an 8 volt battery with a 6 volt charger. The voltage of the charger must match the voltage of the battery.
yes more voltage
No.
12 volt
Usually 12 Volt
No, the battery charger has to match the voltage of the battery it is to charge.
12 volt of an ordinary inverter battery
This is not advised! The 9-volt charger might have a current limiter so that nothing burns up, but it any case if left on it will destroy the 6 volt battery by overcharging. A 6-volt charger is not expensive.
Some have a switch for 6 or 12V - if not you will "cook" a 6 volt battery using a 12 Volt charger
12 volt.
Yes, it has twice the voltage power.
Can You Charge...Yes. As a matter of fact, in order to charge a battery, the charging voltage HAS to be greater than the charged battery's voltage or no current will flow and charging cannot happen.Of course, the charging voltage cannot be excessive, or damage to the battery being charged will result.In your question, 4.6 volts is not excessive for a 4.2 volt battery.