In Bolivia, where I live, I have seen car batteries sold at the equivalent of somewhere between 50 and 100 US-dollars. The price varies quite a lot, depending on the brand and the capacity (which is usually expressed in Ah).
You would have to be a lot more specific.
pretty much the battery in a dodge stratus is used for starting and to complete the charging circuit. this is same in any vehicle
7.4 volts.
you get $80 with battery charger and usb cable
Check the charging current, it may be too much for the motorcycle battery and cause damage to the battery with risks of buckling electrode plates, cracking of the case, explosion or fire.
mercury is only used in a mercury battery
A primary battery is the first used, most common battery, the secondary battery would be like a back up battery, or a battery that is used less.
That completely depends on how much current is used by the circuit or device that's connected to the battery. For example, if there is no circuit or device connected to the battery, and no current is used, then the battery lasts for quite a long time. But if you lay a screwdriver across the battery terminals and create great balls of fire, then the charge on the battery may only last for 1/2 second.
According to Energizer, they claim that their rechargeable AA batteries will hold their charge for up to 1 year. How long a battery lasts is also dependant on how much it is used.
In much of the world, flat is the word of choice for a battery which is nearly used up. A more correct term would be 'exhausted'. Weak, used up, run-down are all acceptable terms. 'Dead' can be vague when referring to a battery. It can mean a battery that will not accept a charge, or will not retain a charge, or a battery that is completely exhausted but would still be functional if charged.
Most batteries used in watches are one and one half volts 1.5v]
Because the chemicals (Lithium and Cadmium) are so much more expensive than Zink (I do not know of any "Copper battery") Carbon is used as the other electrode in a Zink-carbon battery. Li and Cd need to be very pure so that the battery does not overheat or loose charge quickly.
There's no set answer to that, it depends on the battery chemistry, how much the battery has been used since full, and what the battery is hooked up to. But basically, when new, every battery, when hooked up to a modest load, will have a tad more than the rated voltage - in this case 9 volts.