The batteries most likely are not cracked.
The best thing to do is remove all batteries making shure you draw a diagram of all the circuitry of the large and small wires.
Using a solution of baking soda and water clean the batteries and the framework of the battery compartment, be carful where you do this as the build up of this material is hazardes.
After all is clean and debris is removed, clean all terminals and reinstall according to your diagram, the should clear up your corrosion condition.
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