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Wearable devices are smart electronic devices with one or more sensor that can be incorporated into clothing or worn on the body as an orthotic or fashion accessory. To power the wearable devices, various kinds of active and passive energy harvesting techniques are discussed in the literature. Active techniques such as electromagnetic energy transfer, and passive techniques such as harvesting energy from human motion or body heat are explored. In this paper, we present a new method to power wearable sensors using stencil-printed textile-based batteries that will selectively turn on when wet. Specifically, we examined silver-zinc batteries that are stencil-printed on synthetic fabric material such as nylon in different configurations. The printed batteries are characterized by voltammetry tests.