What happens with gas in sealed batterys??

Submitted: Wednesday, Mar 28, 2012 at 14:57
ThreadID: 92842 Views:1979 Replies:4 FollowUps:0
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Probably a dumb question- but here goes anyway.
I understand that when batterys are charging, they expel gas- probably hydrogen.
OK- in sealed batterys- where and how and if does the gas go ???
Cheers J&D
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Reply By: Notso - Wednesday, Mar 28, 2012 at 15:17

Wednesday, Mar 28, 2012 at 15:17
As long as the charge rate is not too grossly above normal the gasses recombine.

This link explains it.

Battry Gasses
AnswerID: 481625

Reply By: Member - Warrie (NSW) - Wednesday, Mar 28, 2012 at 21:32

Wednesday, Mar 28, 2012 at 21:32
My reading of other data is not to exceed 14.4 volts or so. Above this hydrogen forms at the cathode - the negative terminal. Its production will start to destroy the grids inside the battery. Yes, I just read in the above link that the gases will recombine - but the damage has been done. I imagine that if you left your charger on at say 15 volts for several hours you will damage the battery permanently.
Waeco recommend a voltage limiter to be connected in series wth the charger for the fridge. Of course theirs costs an arm and a leg so hit the net. Maybe try a CTek.......W

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AnswerID: 481676

Reply By: oldtrack123 - Thursday, Mar 29, 2012 at 22:42

Thursday, Mar 29, 2012 at 22:42
First of . do not be mislead by the term "sealed"
They are not fully sealed but are valve regulated
The electrolyte is in a paste form with additives that cause the gases to recombine in normal charging , if the charge rate or voltage is too high the gases do not recombine & are vented via the valves/
correct charging is required for long life
Overcharging will lead to paste drying out & short life
AnswerID: 481807

Reply By: blown4by - Friday, Mar 30, 2012 at 22:44

Friday, Mar 30, 2012 at 22:44
They are not fully sealed.They are fiitted with a small breather. Some have a short clear plastic tube connected to it.
AnswerID: 481930

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