First of all you have to get up there, you might need a ladder or chair or something. Once your up there jist jump off, try to land on your feet.
Sounds like the battery has a dead cell
Dead battery, Alternator not charging, Ignition off draw draining battery,.............
The battery is dead, you are going nowhere so why take the handbrake off. But, if you insist, just connect a good battery to the dead battery and jump start the engine.
Yes. Just make sure to use a battery of the same voltage.
Best to take battery off car to re-charge. If jump started off of engine block power surge can cause costly repair of delicate electronic circuits and computers
It sounds like the alternator is not charging.
This usually means that you have a dead battery. Either from a bad battery, or a bad alternator.
Find the keys, then jump it off and try to start the vehicle.
If you charge the battery up and it will run and start for a while and then dies again you know its not getting charged. If you charge the battery up or jump it off and it is dead again the first time you cut it back off its a bad battery.
If the battery is dead the alarm will not go off
Assuming that the vehicle that the jump leads were attached to is running OK I'd say that it's the battery that's dead.
Either the alternator is not providing a charge to the battery, or the battery has a dead cell and won't hold a charge. There are auto parts stores (AutoZone, Advance, O'Reilly's) that will check batteries and/or alternators free of charge.