It uses a 12 volt lawn mower engine battery.
Usually 12 volt negative ground.
Battery is 12 volt, U1 group
It should be 12 volt.
My lawn tractor is 12V, but I bet there are 6V ones also.
The majority are all 12 volt.
Positive 12 volt
12Volts
The best way is by the number of lids or cells in the battery. Each cell is approx. 2 volts. 6 volt has 3 lids 12 volt has 6 lids.
12 volt
6volts 2amps for 6 volt battery, and 12 volts 6amps for a 12 volt battery. Don't charge a 6 volt battery on the 12 volt setting or it will explode!!!!!!!!! you're ok going the other way though.
If it is a model from the last fifty years it is a 12 volts battery.