Charging new dewalt 18 volt battery11/23/2023 It happens when the battery is undercharged or left uncharged for a long time. Sleep mode is when a battery is completely drained, shutting it down and taking a while to boost. If the contacts are dirty, use a clean cloth to wipe the contacts and the charger till it is clean, then test with the charger to see if the battery charges. Connect the charger to see if it responds and charges the battery properly. If you have rusty contacts, scrub them and the battery charger until the rust is completely off. To clean the contacts, you need sandpaper with fine grit between 320 and 400, a clean rag, and a charger to test if the battery now charges fine. Cleaning the contacts removes the dirt, allowing current to flow freely into the battery. Dirty or rusty contacts will not allow charges to get through easily because it interferes with contact between the battery and cable. This is the easiest method to apply when fixing your Dewalt battery charging issue, so it is likely your first resort.
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