Is 12 volt battery same as 23a battery?

If the "A" in 23A refers to ampere (in which case it would be written in uppercase), then no; voltage and current (the number of amperes) are unrelated to one another.If 23a is the model number of the battery, you would just have to check the specifications of the battery (it should normally have a metal plate with the specifications on it), to check whether the voltage is 12 volt. Car batteries usually have a voltage of 12 volts.