First off, 24 volts open circuit is a dead battery. 25.1 is a charged battery. If you have a volt meter, hook it up across the main connector. Watch the voltage after you plug in the charger. After the charger goes through the start up sequence see if the voltage rises. If the voltage rises and the charger kicks out note the voltage when the kick out occurred. If the voltage rises too quickly it is an indication of a shorted battery. If you get no voltage rise you have a charger problem.
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