>
> Re the voltage on the termainals. A transformer is a heavy and
> expensive component. As the UPS battery is normally sealed away in a
> box, it is not necessary to provide isolation so if the designer can
> reduce cost and shipping weight by using a non isolated design, he
> probably will (and should).
> Note that the terminals may not be at mains potential by may be
> connected to neutral. This is fine until the phase & neural
> connections get reversed!. So don't just take a measurement and assume
> it will always be OK,..
> Even if it looks like there is a transformer involved, don't assume
> it's isolating. It could well be an autotransformer,, or a transformer
> with reduced creepage/clearance dimensions, again to reduce costs.
>
> RP
>
>   
This is good enough explanation to be careful.  I moved the batteries 
outside out of reach of my kids, in a well ventilated area and covered 
the battery terminal too.
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