Posted by RAB on May 11, 2008 at 23:15:45 from (195.93.21.134):
In Reply to: battery charging posted by StuBC on May 11, 2008 at 16:16:46:
Remember it is not just the hydrogen that explodes - it is the fact that it is mixed with oxygen at the perfect ratio for re-combining to form water that makes it that more dangerous.
You are electrolysing water to it's component elements with a lot of electrical energy. That energy change is reversed in a millisecond if there is a spark.....boom.
It does not need 6 amps, or more, to cause this change. Simply too high a charge rate (an alternator can charge at 60+ amps with no problems on a good battery but on a poor or undersized battery that could easily ruin the battery in a short time). Simply passing a current through a cell which is not accepting the charge will electrolyse the electrolyte and things will be made worse, if it cannot vent easily.
Also you should not pressurise a cell in any way. That could cause deformation/buckling, resulting in an internal spark and explosion.
Checking the S.G is important but simply, if only one cell is gassing, that cell is likely to be on the way out, as the others are charging and that one is electrolysing.
There must be loads of manufacture/ supplier information on the net. You will get more good information there than listening to those who give you a bum-steer on any discussion forum.
I am assuming you are using a flooded lead/acid battery. Gel batteries require a different procedure and if you have one of those it is probably ruined if you have gassed the cells for any length of time.
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