Adjustable LiPo Charger Hookup Guide
Contributors:
Alex the Giant
Alex the Giant 
Hardware Overview
For a quick reference, here is an annotated diagram of the parts used on the Adjustable LiPo Charger:
| 1 | Charge Input - The input voltage for the MCP73831 charge IC is between 3.75V to 6V. To fully charge a LiPo battery, it is recommended to have a voltage of around 5V. The charge IC will regulate the voltage down to safely charge the LiPo battery. (Up to 500mA of current may be required depending on the charge rate). |
|---|---|
| 2 | Power LED - When power is supplied, this red LED should turn on. |
| 3 | Status LED - When a battery is connected, the blue status LED should turn on. When the battery is fully charged, the LED will turn off. |
| 4 | Battery Input - Only one battery should be charged at a time. There are a total of 3 battery inputs: JST connector, PTH pins, 2450 coin cell holder (on the back). |
| 5 | Charge Rate Select - Selects the maximum amount of current to charge the battery. For a detailed explaination, see the Battery Charging section of this guide. |
Charge Status LED
The on-board blue STAT LED can be used to get an indication of the charge status of your battery. Below is a table of other status indicators depending on the state of the charge IC.
| Charge State | LED status |
| No Battery | Floating (should be OFF, but may flicker) |
| Shutdown | Floating (should be OFF, but may flicker) |
| Charging | ON |
| Charge Complete | OFF |