having a flat battery should not damage a car however in newer cars you might have to get some things re-set like the imobiliser,ecu etc
depending on you battery usually between 2-4 hours if you leave your headlights on. My Car battery was completly dead after almost 4 when i wrote my exam.
Recharging a dead battery by using jumper cables connected to another vehicle is a very bad idea. You are overworking the alternator on the donor vehicle and can very well destroy that alternator. Recharge a dead battery with a battery charger and never with another vehicle.
until the battery is dead
No. But if left for a very long time any battery will go dead. you have to leave the battery hooked up to terminals for that the battery will contantly charge while being used in your car otherwise the battery will eventually go dead.
A Compaq nc6000 will run on ac power when the battery is dead. The battery is long lasting but it can be charged by using ac power.
Yes, but it will take a very long time if the battery is dead.
Not exactly "damage", but if you keep it on the charger all the time, then the battery capacity may appear to decrease, i.e., the battery won't last as long when you do use it. Think of the battery as a muscle.
yes as long as it is not totally dead.
Firstly, you can try by charging it, but you'll be asking, "What if you don't have the charger handy?" Don't worry, there are simple ways to overcome this: 1) You can use the code *3370# on nearly all mobile phones and this will start the phone using the power reserve. When charged again, this reserve will be restored before the normal battery. 2) You can try heating the battery, by waving a lighter underneath the battery. But remember to wrap the battery in aluminium foil first! This is dangerous, so do not heat it for too long as it can damage the battery.
Connecting a battery charger backwards to a battery will likely kill the battery, depending on how long the power is attached.
I assume you mean how long to charge the battery. You should never let the alternator charge a dead battery if possible. The alternator is designed to keep the battery charged but not to charge a dead battery. You put a strain on the alternator and it can cause a diode to burn out. Drive home and then put a battery charger on the battery to fully charge it.
Around 4 hours on a dead battery.