You will be connecting the two adapters in series which combines the voltage of the two adapters into the total of both without increasing the amperage. By connecting two 12v adapters you can achieve the 24 volts of current you need without the extra cost.
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2 12v batteries to make 24v. Due to the volume of 12v power supplies available because file servers mostly use 12v power supplies they are really inexpensive and easy to find. You now have two batteries connected in series. A 24v power supply from two 12v power supplies. If the electrical device is a 24 volt trolling motor the battery will only provide the motor with 12 of the 24 volts of electricity it needs to start the boat. Adding the additional battery add a second 12 volt battery to the circuit. Two or more 12 volt batteries wired in parallelpositive to positive negative to negativeis still a 12 volt system.
Several people that know i sell 12v power supplies have asked about 24v power supplies. How to make a 12 volt battery 24 volts. If that was the original charger it will work just as well charging 2 12 volt batteries in series as it did charging the 24 volt battery. Connect one battery cable to the positive terminal of one of your 12 volt batteries. Connect the other end to the negative terminal of the second 12 volt battery. If you are simply replacing a 24 volt battery with 2 12 volt batteries and the batteries are reasonably well matched same manufacturer size ratings ideally same date code then you are good to go.
Two or more 12 volt batteries wired in seriesthe positive terminal of one. 24v power supplies are expensive and hard to find.