Batteries? In the gauge? Are we talking about the round gauge with a needle and a vent on the hose? Batteries?
All digital tire pressure gauges have batteries, the little button kind. Something has to power the digital display of the psi. Mine is kind of like this one,
http://www.accutiregauge.com/talking-tire-gauge/accutire-ms-4445-b/, except they don't make my exact model anymore.
However, I think I just destroyed my formerly trusty gauge. When I went to install the new batteries I realized the gauge didn't indicate which side was positive, and I'd already removed the old batteries. So I guessed, and the gauge did not work. So I reversed the batteries, and tried again, and now it is way, way off. It tells me that my bike and my car tires are at 90 psi when I know neither of them are anywhere close to that. I assume that installing the batteries backwards did that, so I guess I'll be buying a new tire gauge today.
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