The Charge Plate is one of the Plates added by Thermal Expansion. It is an upgraded version of the Redstone Plate. It charges Redstone Flux-powered items held or worn by entities that touch it, as well as dropped items that touch it.
The Plate can be placed on any side of a block.
The Charge Plate charges Redstone Flux-powered items at a maximum rate of 1000 RF/t. This rate may be limited by the charged items. The Plate can store 80000 RF internally. Unlike Machines, the Plate does not slow down if its internal energy storage is starting to deplete.
The Charge Plate can be configured by sneaking and using a Multimeter on it. The Plate's GUI is then opened: