No, you can leave it in the car. Just disconnect the positive + cable and it should hold it's charge for 6 weeks.
if the battery is good and charged sure
The computer's power, or its ability to stay powered on and running, is maintained by the charge in the battery. The battery's electricity is used by the computer to keep running. If there is no charge in the battery, or the battery is removed, the computer will shut off and will not be able to be powered up.
yes if the battery is the same voltage, wire should be used to do this.
zdistilled
Your battery should maintain a charge for months, if it does not then you might have an improper ground allowing for a slow drain on your battery. In general you should start your car and let it run every few weeks to prevent gelling in the engine as well as build up from sediments. You should also move it so as to prevent flat spots on your tires. You can purchase and use a trickle charger to keep it charged.
It is basically a heavy duty switch that you install between the battery and the cable on the positive side. It has a key that is used to turn it off and on and can be removed so that the car can not be started without it. Used for security and to prevent any drain on the battery. Using one is easier than disconnecting the cables at the battery, just turn the key and go.
If it will physically fit in the space, then yes, the 2700 mAh battery should work fine.
For a self-adhesive stamp, no it should not be removed. Mint means it is still capable of being used for postage.
A charger designed for a 12 volt battery should not be used to charge an 8.4V battery. It is likely to damage the battery and in the worst case can cause a fire. There are some chargers that can be used with a variety of battery voltages and chemistries but unless you are certain that the charger is safe and effective on a different battery voltage, assume that it cannot be used.
That greatly depends on what "recovery" means to you. The sutures used are usually removed after 2 weeks, but extra care must be taken with the area for a total of 4 to 6 weeks.
You should be able to use any brand of battery the only thing that matter is where the battery posts are and the size of the battery.
As long as the battery is kept charged then it should last 3-5 years.