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Remove corrosion from battery terminal

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Clean corrosion with vinegar, alcohol, and coat with dielectric grease

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Using white vinegar, clean any corrosion off of the battery terminals or anywhere else you find it, including the battery cables.

Then use isopropyl alcohol to clean the vinegar off of the pcb.

Coat the problem areas you just cleaned with dielectric grease of your choice.

Reassemble in reverse order.

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