I think you mean "why doesn't my key work to open or lock the doors?" If that IS what you mean, the key's battery sends a radio signal to the cars computer. The computer directs the door lock system to lock or unlock the doors, but it gets it energy to do that form the battery. Hence: Car battery dead - car's onboard computer cannot respond to directions from the key signal.
no
The hazard lights get their power from the battery so if the battery is dead they will not work.
For an external GPS, yes, assuming that battery is not also dead.
Use the key to unlock it. The key is manually activated. Only the keyless entries will not work when the battery is dead.
because the battery is dead.
If the battery is dead the alarm will not go off
It depends why it doesn't work. If it is just flat, then usually you can. If the battery has been damaged then maybe not.
Do you mean "jump start"? If so, yes- it requires a car with a good battery, and a set of jumper cables- connected the RIGHT way between the two vehicles. With older vehicle, it was possible to "push start" the car with the dead battery- but with modern electronics, and a completely dead battery, will not work.
battery dead.
A battery jump starter works by taking the charge from another battery, such as in another car, and passing it to the dead battery. When the charge is sufficient in starting the dead battery, it should then start charging itself as the engine runs.
A storm has nothing to do with the battery going dead.
Dead battery, loose or corroded battery connection, or defective ignition switch. Can also be a defective neutral safety switch.