I am wondering what the green and blue deposits on the inter-cell-connectors of some of my spare Vectrix NiMH batteries are.
The particular cells appeared to be in good order and where tested some years ago, then combined into 9 or 10 cell modules and left standing on the shelf.
The silver connectors between cells (ICLs) have a green layer growing on them, starting from where they connect to the negative pole of one of the cells they connect. In some places a very brilliant blue substance is building up around the edges, looks like crystals growing.
Is this due to leakage or some stuff that settles out of the air?
![Vectrix_NiMH_deposits[1].jpg](/sites/default/files/u1086/Vectrix_NiMH_deposits%5B1%5D.jpg)
2x
This is simply the oxidation of copper that it turns green, like the Statue of Liberty, it would have been better to store cells in airtight plastic. You can simply grease lightly the connectors after you have remove the oxidation with glass paper. Your cells are ok.