Hello BigEndBob
High charging currents or cell voltages (higher 2.4 V) cause gassing. The distilled water splits into hydrogen and oxygen. This oxy-hydrogen is, of course, highly explosive.
As far as I know, this effect applies to all lead-acid accumulators including those in cars.
Best regards
hvogt
Last edited by hvogt; 15th May 2008 at 16:12.