no, if you charge 9 volt battery with 12 volt battery you will destroy 9 volt battery
No. The charger for a car battery has an output measured in amps. You have an output measured in milliamps. There are 1000 milliamps to 1 amp. Way too small.
Yes, but you cannot leave it for long periods of time or the battery will overheat and boil acid away. Normally a fully dead battery to a full battery should take about 2 hours to charge up at 40 amps.
All the light bulbs in your house are in parallel across the power line.All the devices plugged into a power strip are in parallel.Everything in your car that gets power from the 12V battery is in parallel.etc.
Only if clean rainwater or distilled, and even then not very much. Just enough to cover plates, and charge immediately on long 2 amp charge.
Most lawnmower batteries will be badly abused by this and it will be quite expensive in gasoline. A lawnmower battery will normally take 8 hrs (or so) to charge. Forcing them to charge faster, like off your car, will harm it.
If it is totally dead charge it for 2 hours at 10 amps.
Depends on the amperage of the charger. A 10 amp charger will charge it in about 1 hour.
The battery is a 12V car battery.
A good auto battery will hold it's charge for at least 6 months or longer.
Depends on the amperage you are applying to it. Read the charger manual.
As long as the battery in the lawnmower is a 12 Volt battery you will be fine.
Voltage is the same but amp hour capacity of the car battery is much higher.
Yes as long as it is the right voltage: a 6v battery needs a 6v charger; a 12v battery needs a 12v charger. <><><> If you can set the battery charger's output to give either a 6 or a 12 volt output, then you must always remember to set it to 6 volts if you want to use it to charge a 6 volt motorcycle car battery.
Yes, you can do this.
No
regular car battery. standard 12V