At 09.51 2011.12.31, you wrote: >As others have said, it should be OK in a large room (I would not >recommend a bedroom - something more like a basement) with some >ventilation (window open 1 cm). It definitely should not be put inside >a tightly sealed box. The main reason is explosion risk. Hydrogen is >such a small molecule that it will diffuse slowly through the plastic >walls of the battery and then may accumulate inside the sealed box. >Any concentration >4% by volume in air is flammable. By the way, do you know the concentration of "flammability in air" of gasol= ine? By volume or weight either is OK. Thanks in any case! Mario >If the battery is >over-charged, then it will gas much more quickly, so the hydrogen and >oxygen will come out of the vents. The battery may get hot enough to >boil the electrolyte, in which case you get sulfuric acid and water >vapor coming out of the vents, too. If the external container were >really well sealed and there were a lot of boiling, the container >could burst from the pressure, but that is unlikely. > >Russell, you must have really over-charged that battery! I once >accidentally breathed in a good whiff of sulfuric acid vapor and felt >a burning sensation in my nose and sinuses, but it had no lasting >effect beyond a couple of minutes. > >Sean > > >On Fri, Dec 30, 2011 at 5:40 PM, V G wrote: >> Quick question - does a SEALED lead acid battery need to be charged in >> a ventilated area? >> -- >> http://www.piclist.com PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >--=20 >http://www.piclist.com PIC/SX FAQ & list archive >View/change your membership options at >http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .