XPost: alt.home.repair, sci.electronics.repair   
   From: @.   
      
   Rod Speed wrote on 1/19/2023 3:41 PM:   
   > David Lesher  wrote   
   >   
   >> You want the spark when disconnecting to be AWAY from the   
   >> rapidly charging battery.   
   >   
   > There is no hydrogen when the once flat battery   
   > is being charged once the engine has started.   
   >   
   >> So: Run the negative from frame to frame,   
   >> and disconnect at the rescue car first.   
      
      
   I real life scenario there is no danger of hydrogen accumulation under   
   the hood because it is too airy inside the engine compartment.   
      
   There will be danger of hydrogen accumulation if the lead-acid battery   
   is confined inside a box, like underneath a motorized wheelchair.   
      
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