A piece of metal (something metallic) may have rested against the pole (positive and negative) and caused the battery to rapidly drain - heating it up in the process.
It heats up very hot and may explode.
No
No, the battery will be overcharged and battery damage will occur if it is done.
No, a lead acid battery is a wet cell battery and a 9 volt alkaline battery is a dry cell 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.
no
A 9 volt battery is stronger than a 1.5 volt battery because it has a higher voltage. The higher voltage allows the 9 volt battery to power more demanding devices and last longer than a 1.5 volt battery.
1.3cm
a 9 volt battery
buy a battery charger
it operates a battery,mostly a 9 volt battery
One is 9 volts and the other is 12 volts. They do not interchange!