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Battery Water (revisited)
Maynard G. Krebbs wrote: On 30 Sep 2003 22:21:31 GMT, (BOEING377) wrote: Do those so called catalytic battery caps actually work? The are supposed to use a catalyst recombine outgassing molecules back into H2O which drips back into the battery cell. I am sceptical. I think it's in Calder's boat maitainence book where he says they work but you should remove them before equilizing your wet-cell batteries because of the pressure buildup. The Hydrocaps are basically a large baffeled cap with a small piece of a catylist in it. The catylist makes the hydrogen recombine with oxygen. The reaction produces water which drips back into the battery and some heat. The hydrogen in the water takes up a lot less space than the hydrogen gas so the pressure inside the battery is slightly lower than the air outside. This pulls more air in through the baffels so that there is more oxygen to be combined with the outgassing hydrogen. Like I said, the reaction produces heat. During normal charging the heat is radiated off the fins on the caps but during equalizing the battery produces a LOT more hydrogen. When all that extra hydrogen starts recombining the caps can get hot enough to melt. -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com |
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