The Brookfield Volunteer Fire Company is cautioning residents with solar panel batteries to make sure and check or service the system per the manufacturers and installers recommendations.  They have responded to a few instances with golf cart or boat batteries being charged indoors over the past few years resulting in false readings of elevated carbon monoxide levels.  This new warning comes as a Harwington home had a CO alarm sound, caused by a Lead Acid storage battery for a solar panel system leaking.  Fire officials say while these batteries do not produce Carbon Monoxide, leaking batteries can produce Hydrogen, which has been found to cause a false positive reading on CO detecting instruments due to a chemical reaction that can occur at certain concentrations, especially in confined areas.