they can be recharged by hooking jumper cables from a car to the mower or if the battery is fried you would have to buy a new battery for it
Use a battery charger just like the one you use on an auto battery.
Depends on the output of the charger which you did not list. A dead battery can be recharged with a 10 amp charger in 3 hours.
yes.
the magneto
12
totally
No, you can charge it on the mower and you do not have to remove it or disconnect the cables.
12 volt
Mower has a generator, which is turned by the engine. When engine is running, generator produces electricity to charge the storage battery.
price
Walmart, Autozone. O'reilly's, Advance,,,,, etc.
no
No, stop charging and replace.