The old A batteries used in vacuum tube radios were initially 2 volts but later 1.4 volts became more common. You can find them also in other voltage ratings.
You need to divide the 48 volts by the voltage produced by a single battery.
1.55 volts
An AG10 button battery typically has a voltage of 1.5 volts.
A good AA battery has about 1.5 volts across it.
12 volts DC
1.5 volts
The battery for an 95 Infiniti J30 is 12 Volts.
12 volts
12 volts
12 volts DC.
It can put out too many volts and destroy the battery but not drain it. The alternator should put out between 13.5 to 16 volts.
A typical lawn mower battery usually has a voltage of 12 volts.