| More on Black wire corrosion from the Futaba service department-
There have been some comparative tests designed to identify the cause of black wire corrosion, the results of which indicated that a prime factor is storage in a damp atmosphere. The combination of damp air and a charged battery leads to an electrolytic effect that results in an acidic condition at the negative terminal of the battery. It’s not only NiCads that are affected, check out the earth strap on an older car sometime, and if the connection has not been properly protected, the same corrosion effect can be seen.
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