You can charge all kinds of things with shungite disks. We personally have a few of them scattered around our homes. One in the kitchen, one by nightstand to charge water at night or even to put the phone on it to protect from EMFs. Our desks have several, one to clear crystals and the other one for my tea and water.
The pattern of the Flower of Life engraved on our shungite has special measurements. It is an energetic geometry, a solar sacred geometry. When geometry is connected to the sun and earth, incredible things occur and that are essential for building sacred sites. This is an entire other story though. What makes our Flower of Life shungite disks special is that the measurements in the geometry create a violet vortex of energy at the center of the shungite disk. This vortex is healing and opens all seven chakras, especially the crown chakra.