When the hi-lo battery i being charged it produces oxygen and what?

What car is built with four seat belts in the front seat? How can you tell if it's your battery or alternator that's bad? Drive belt from engine to mower deck on craftsman mower won't stay on idler pulley? Where can you find a timing belt installation diagram? Where is fuel filter located in 2004 Yukon? How do you reset a fuel pump switch on a 1993 Ford Tempo? How do you change the rear brake pads on a 2004 Chevy Trailblazer? How do you take off a brake light? Where is the fuel gauge relay on a kia rio se 2003? What is the purolator oil filter cross reference for a fram 3614 oil filter? How many quarts of oil does a 2004 DT466 engine require? What does it mean when you try to start your van and the dash board says done? What fuse runs the fuel sending unit on a 2007 kenworth t800? Where is the brake light switch located on a peterbilt 587? How do you thaw fuel injectors for 2001 dodge stratus? What are the airplane tires made of? Why is odometer light on? 1999 Chevy Malibu your heater is blowing out cold air and the overheat light came on What could be wrong? 1998 ford e150 front end shakes when appling brakes at high rate of speeds? How is a 4800 mAh battery different from a 7800 mAh battery?