Impossible to do with a single 6 volt battery.
No.
No. The battery will be charged at a rate which is 2* the normal rate. This will cause the battery to overheat which might cause it to explode.
Yes but you will deplete the battery quickly.
It takes between 8 and 12 hours to charge a 12 volt battery at 2 amps. The actual time will depending on how much charge is in the battery initially.
no, it will be damagedANS 2 - Actually, it won't be damaged because it is impossible to fit the battery base of a 14.4 battery into the 18 v charger.
Separate the 2 12 volt batteries and charge them individually.
Yes, it can be used to charge that battery. The chargers rating, 2 amps, is the maximum that can be drawn from it.
Check voltage on battery 12 volt you should uses a 12 volt 2 amp battery charger connect red (positive) to the + side of battery and the black (negative) to the - side of the battery.
Yes, you can.
To use two 12 volt batteries in a 24 volt system they must be wired in series. For this explanation I will refer to them as battery #1 and battery #2. This answer describes the wire connections for a vehicle with a negative ground electrical system. The cable from battery#1 Negative terminal connects to ground (Frame or engine block). The cable from battery#1 Positive terminal connects to Battery #2 Negative terminal. The cable from battery#2 Positive terminal connects to Starter solenoid.
you will have to get 2 batteries and compare it
Take 3 twelve volt batteries Run the + of battery #1 to the - of battery #2. Run the + of battery #2 to the - of battery #3. Use the + of battery #3 for your positive feed, and the - of battery #1 for your ground.