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"Frosting" on top of Ni-Cd batteries

gubavac111

New Member
Just wondering what this "frosting" on the Ni-Cd battery could be? How is it created? Is it dangerous? Should it be removed?

Check the pic below.
 

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Ian Rogers

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NiCad? where are these batteries.. They look like lead acid batteries to me.. the "frosting" is acid spillage once it has been charged...


NOTE!! Appologies… After a bit of googling they are Ni cad... Never seen top-upable ones before... Still warm water removes this corrosion.. Still looks a tad overcharged though..
 

dr pepper

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Looks like a mobile plant battery.
I maintain mobile plant but I've never seen a ni cad one.
 

gubavac111

New Member
Yup, Ni-Cd batteries and they are used in UPS for a telephone exchange. I am pretty sure no acid reached the cap. Do you mean some vaporized acid (if that is even possible)?
 

Ian Rogers

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Reading further... They shouldn't do that... The top is a flame suppressor... They are called "pocket plate ni-cd batteries" But nothing should get out as they have anti overcharge capability.... I hope someone in your company didn't think they were lead acid and topped them up....
 

gubavac111

New Member
Reading further... They shouldn't do that... The top is a flame suppressor... They are called "pocket plate ni-cd batteries" But nothing should get out as they have anti overcharge capability.... I hope someone in your company didn't think they were lead acid and topped them up....
Nope, they are all filled just below the MAX level. Is it possible that charging current is too high and that is the reason why this is happening?
 

Ian Rogers

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