Battery Charger/ Maintainer. The automatic variety will constantly check the battery and keep it "topped off".
Solar Chargers are very green and pay for themselves over time. Some can be plugged into the cigarette lighter.
It depends on how much drain is placed on the battery !
If your battery is good and you know your car is draining it then yes, disconnecting your battery from your car will keep your battery charged for much longer than 3 days. Your battery should stay charged way longer than 3 days in normal conditions being hooked up to your car. You should get it checked out and figure out what is draining your battery so fast.
Yes, once you have jump started the car (from another car's battery), driving the car will recharge the dead battery (provided the battery is OK). This is a terrible idea and may damage the alternator. Drive the car immediately home and charge the battery with a battery charger. Alternators are designed to keep a charged battery fully charged. They are not designed to charge a dead battery. This puts way too much strain on the alternator circuits.
No it can't die, it's a battery it's not alive!
depends what type of battery and how much shots you take
In 24 hours it will be charged enough to start the car. You really need a much larger charger for a car battery.
You should always charge your cell as often as possible. If you don't, the portion of the battery that isn't charged oxidizes, and this causes it to become weaker overtime. As long as you keep it fully charged, it will last much longer than it would have otherwise.
Automobile battery is 12 volts. If it is fully charged you should actually read 12.6 volts.
you drive it to much, or you are buying the wrong battery
With pretty much any lead-acid battery, 15-amps will give you a full charge. ** More than 15 amps will cause overheating. Less than 15 amps will recharge too slowly. 2 amps is referred to as a "trickle charge", and is placed on a full charge to keep the battery fully charged. This is especially useful in the winter when you are using a weak battery in which the capacity might drop off (cels are sulfated / battery is not as efficient). *** However, consult your manual and/or 4-wheeler dealer for information about your specific vehicle.
The battery charging system of diverse electronic devices may get confused over time, in the sense that it doesn't keep track correctly of how much charge the battery has. In such cases, it sometimes helps to take the battery out and put it back in again.If that doesn't help, I would consult with a technician.
from 13 to 15 V approx