Battery

At what amperage are you charging it at and are you sure you have a good connection on the battery charger?
At 10 amps it would take a few hours, at 4 amps, maybe all night to charge the battery fully but that depends on just how drained the battery actually is. If it is just low like around 10 volts or so, it should not take long.
Do you have a voltmeter to test the battery voltage?
If so, see how much it is.

The battery is only reading 2 volts?
That is basically completely drained.
You would get a better charge from another vehicle's battery if you had jumper cables.
At 6 amps though I would not be surprised if it took 10 hours to get it back up to 12 volts.
Then you will have to find out what is causing the battery to drain.
Just in case something was left on, you should probably unhook the negative battery cable so the charger does not waste energy turning on whatever was left on.
If nothing was left on, then you will have to check for a short after you get the battery recharged.
You might also get lucky and do not need a new battery.
A battery can go drained and recharged numerous times before it actually goes bad.
Once you get the battery back up to 12 volts, walk all around the vehicle seeing if any lights were left on, inside or outside, radio, etc.

Yes, 2 to 4 amps all night.
I do not see why you could not remove the drained battery, then set your drained battery on some wood close by the other vehicle, attach the jumper cables then and charge that drained battery for about thirty minutes while sitting in the drivers seat with your foot on the gas revving it up to about 1,500 rpm.

You are welcome and good luck!