>3) Make sure the battery terminals can't be touched.  There is a
>significant chance that the batteries are connected directly to
>the incoming power line.  Plastic battery cases with lids would
>help there, along with appropriate warning labels.  Keep in mind
>that you are trying to protect people other than yourself from harm.

And to protect yourself from harm while checking the batteries, go down to 
your local auto wrecker and see if you can get enough of the little plastic 
terminal covers that get put on the 'hot' battery terminal when they are in 
a car. These will protect you from touching the terminals accidently, or 
inadvertently shorting across a battery with something metal, while checking 
the electrolyte.

The battery supplier may also be able to supply these as well, or supply 
them from old batteries. 

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