Your question is not clear and very confusing. Please ask again and this time list make, model, and year of the mower your are referring to.
12 volt
With a 12 volt battery charger set to around 5 amps. Do not overcharge if it is not an automatic charger.
Only use 110-120 volt appliances on a 110 volt socket.
Hot, neutral and ground.
Yes
NO
17
no
115 Volt and a 110 Volt can be treated as the same thing. The electrical voltage supplied from your electric company is not exact and can be 120 Volt + or - 10%.
To wire a 230 volt contactor with a 110 volt coil, you need to connect the 110 volt power supply to one terminal of the coil and the neutral wire to the other terminal of the coil. Ensure that the contactor is rated for use with a 110 volt control circuit. Additionally, verify the wiring diagram provided with the contactor for proper connection details.
No, the applied 110 volt is too high for a 3 volt appliance. The appliance would burn out right away.
Yes.