Energy Shield

Handles the power side of a portable Arduino project: charging a lithium cell over USB, regulating its output to a stable rail, and protecting the cell from over-discharge. Removes the need to build a charging circuit from scratch, which is where most battery-powered projects go wrong. Useful for field sensors, wearables and anything that has to run away from mains power. Charges a lithium cell safely over USB; Regulated output rail for stable operation; Protection against over-discharge and over-current; Removes the need for a custom charging circuit