This is normal for traditional chargers during high-current charging. However, if it smells burning, stop immediately. A low hum is normal operation for the transformer. 6. Maintenance To ensure the longevity of your exclusive Bosch KL 1206 Go to product viewer dialog for this item. Keep the clamps clean of corrosion. Keep the casing clean and free from dust. Inspect the power cable for damage regularly.
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Clean the battery terminals. Check the electrolyte level if the battery is not sealed. This is normal for traditional chargers during high-current