No, because a 60v charger charging 72v battery for 5 hours will not be a problem.
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As long as it is not hot, it will not make the battery water evaporate too much, so it does not have much impact. If it is hot, remove it to see how much the battery water drops, and add distilled water if necessary.
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1, 72V battery charging termination voltage is 72*1.2=86.4V..
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2, 60V battery charging termination voltage is 60*1.2=72V, the actual charging voltage will be a little higher, but it is obviously not full of 72v battery.
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If you use a 60-volt charger to charge a 72-volt battery, although it will not be directly due to high voltage and bad battery, but because the maximum voltage output is only 72 volts, which is much lower than the charging upper voltage of the 72-volt battery 86.4 volts, it is not possible to fill the 72-volt battery, which does not rule out that the current will be large, more than a long time, causing the normal turn of the lamp. Charging continues, may cause the battery water shortage and damage the battery.
60V charger for 72V electric car unless the battery is broken, it will never explode, and it will never be full, the charger is not bad, the battery is not bad, and the charger of the same voltage will never explode the battery.