"Frosting" on top of Ni-Cd batteries

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gubavac111

New Member

• May 26, 2019

• #1

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

User Extraordinaire

Forum Supporter

Most Helpful Member

• May 26, 2019

• #2

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

Well-Known Member

Most Helpful Member

• May 26, 2019

• #3

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

 

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gubavac111

New Member

• May 26, 2019

• #4

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

User Extraordinaire

Forum Supporter

Most Helpful Member

• May 26, 2019

• #5

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....

 

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gubavac111

New Member

• May 27, 2019

• #6

Ian Rogers said:

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....

Click to expand...

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

User Extraordinaire

Forum Supporter

Most Helpful Member

• May 27, 2019

• #7

If you read the data sheet there's one here

Overcharging is not possible.. these thing are supposed to be nigh on impossible to break ( fool proof ) if the electrolyte has escaped a bit there must be a reason... Clean them with warm water and see if it re-occurs...