> ## Documentation Index
> Fetch the complete documentation index at: https://learn.pcbcupid.com/llms.txt
> Use this file to discover all available pages before exploring further.

> Power the Glyph C3 over USB-C or a single-cell lithium battery, monitor charge status, and configure low-power deep sleep modes for IoT projects.

# Power Management

## Power Management for Glyph C3

### Battery + USB Power

We wanted to make our Glyph boards easy to power both when connected to a computer as well as via battery for portability!

There's two ways to power a Glyph:

1. **USB Power:** You can connect with a USB cable (just plug into the TYPE C Port) and the Glyph will regulate the 5V USB down to 3.3V and power the entire board and peripherals (if any connected).
2. **Battery Power:** You can also connect a 4.2/3.7V Lithium Polymer (LiPo/lipo) or Lithium Ion (LiIon) battery to Battery Pads. This will let the Glyph run on a rechargeable battery.

When the USB power is powered, it will automatically switch over to USB for power, as well as start charging the battery (if attached). This happens 'hot-swap' style so you can always keep the lipo connected as a 'backup' power that will only get used when USB power is lost.

<Danger>
  Install the LiPo / Li-ion batteries based on the polarity. Using wrong polarity batteries can destroy your Glyph.
</Danger>

### Power Supplies

The Glyph C3 offers multiple power supply options:

* **BAT Pin**: Connected to the battery pads (behind the board)
* **USB Pin**: Provides +5V from USB if connected.
* **3V Pin**: Provides output from the 3.3V regulator with a 600mA peak output.

### Measuring Battery Voltage

To monitor battery voltage, short the MSR pads behind the board.

### Alternative Power Options

For powering the Glyph C3:

* **USB powered**: Use a 5V 1A USB wall adapter to plug in a USB cable for reliable power.
* **Portable Use Without LiPo**: Use a USB battery pack(Power Bank).
* **Higher Voltage Power Supply**: Use a 5V buck converter and wire it to a USB cable's 5V and GND input.

<Danger>
  **What You Cannot Do**

  * Do not use alkaline or NiMH batteries and connect to the battery port, as it will destroy the LiPo charger.
  * Do not use anything >4.2v LiPo batteries on the battery port, as it will destroy the board.
</Danger>

### External Power Supplies

The Glyph ESP32-c3 is not designed for external power supplies. If you must:

* **Connect an external 3.3V power supply** to the 3V and GND pins
* **Connect an external 5V power supply** to the USB and GND pins.