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How to charge a forklift battery
Be sure the charger is correctly matched to the battery.
This means that the charger has the correct output voltage (12 , 24 volt , 36 volt , 48 volt, etc). Also, the output ampere hour rating on the charger is closely matched (within 10 %) of the ah rating of the battery.
Be sure the charger cables are not damaged or heat worn. The connectors should be in good shape, not damaged or cracked.