Different sizes have different weights. Around 30 pounds is average.
20 lbs
The battery in my 1995 Ford Explorer weighs 45 pounds
It varies with the size of the battery. They do not all weigh the same.
It depends on the battery used. Older batteries batteries, like Cadmium, will be relatively heavy, while 9V alkali batteries today weigh about 100g and 9V lithium batteries weigh about a 3rd of that at 33,8g
That would depend on the size of the battery, you want the amps of the charger to be reasonably proportional to the capacity of the battery.
No
if it is any think over 1 volt it is not a cell battery it is just a 6 volt battery if you had a 1 volt then it would be a cell battery
There is a wide variety of pricing for a 12 volt battery. The overall wattage of the battery will determine overall cost. Typically they will cost anywhere from $100-$400 for a new battery.
No, it will overcharge the 6 volt battery.
it will be too much of a jump. i would recconmend a 2s (7.4V) lipo battery
no, a 9 volt battery is small (goes in a smoke detector) a 9.6 volt battery is much larger, and it is not a DC battery (direct current) but NiCd (nickel cadmium.) two totally different things.
The battery is a 12 volt.