🚚 Free Worldwide Shipping on All Orders!Shop Now
HomeStore

Adafruit LiIon or LiPoly Charger BFF Add-On for QT Py

Product image 1

Adafruit LiIon or LiPoly Charger BFF Add-On for QT Py

The Adafruit LiIon/LiPoly Charger BFF is a compact battery charging add-on designed to mount directly onto the back of any QT Py board. It makes portable power simple — plug in a standard 3.7 V/4.2 V lithium battery, and the charger handles the rest via the QT Py's USB-C connection.

When USB is connected, the charger tops up your battery at up to 200 mA (yellow LED indicates charging). When USB is removed, battery power feeds through a Schottky diode to the 5 V rail. A built-in slide switch lets you turn power on and off, and a voltage divider on pin A2 lets your firmware detect whether the board is running from USB or battery.

Key Features

  • 200 mA Charge Rate – Charges single-cell 3.7 V/4.2 V LiPo/LiIon batteries via USB-C
  • Automatic Power Switching – Schottky diode routes battery power to 5 V rail when USB is disconnected
  • On/Off Switch – Built-in slide switch for power control
  • Battery Monitoring – Voltage divider on A2 pin for detecting USB vs battery power mode
  • Charging Indicator – Yellow LED lights during active charging
  • BFF Form Factor – Solders directly onto the back of any QT Py for a compact stack

Ideal For

  • Making any QT Py project portable with battery power
  • Wearable electronics requiring rechargeable batteries
  • IoT sensor nodes with battery backup
  • Compact prototypes needing USB charging capability

Package Contents

  • 1× Adafruit LiIon/LiPoly Charger BFF (assembled and tested)
  • Headers for soldering to QT Py
Warning: For use with Adafruit LiPo/LiIon batteries only (3.7 V/4.2 V). Do not use with older 3.6 V/4.1 V cells or batteries with different chemistry, polarity, or pinout. Batteries and QT Py board sold separately.
$3.07

Original: $10.22

-70%
Adafruit LiIon or LiPoly Charger BFF Add-On for QT Py—

$10.22

$3.07

Product Information

Shipping & Returns

Description

The Adafruit LiIon/LiPoly Charger BFF is a compact battery charging add-on designed to mount directly onto the back of any QT Py board. It makes portable power simple — plug in a standard 3.7 V/4.2 V lithium battery, and the charger handles the rest via the QT Py's USB-C connection.

When USB is connected, the charger tops up your battery at up to 200 mA (yellow LED indicates charging). When USB is removed, battery power feeds through a Schottky diode to the 5 V rail. A built-in slide switch lets you turn power on and off, and a voltage divider on pin A2 lets your firmware detect whether the board is running from USB or battery.

Key Features

  • 200 mA Charge Rate – Charges single-cell 3.7 V/4.2 V LiPo/LiIon batteries via USB-C
  • Automatic Power Switching – Schottky diode routes battery power to 5 V rail when USB is disconnected
  • On/Off Switch – Built-in slide switch for power control
  • Battery Monitoring – Voltage divider on A2 pin for detecting USB vs battery power mode
  • Charging Indicator – Yellow LED lights during active charging
  • BFF Form Factor – Solders directly onto the back of any QT Py for a compact stack

Ideal For

  • Making any QT Py project portable with battery power
  • Wearable electronics requiring rechargeable batteries
  • IoT sensor nodes with battery backup
  • Compact prototypes needing USB charging capability

Package Contents

  • 1× Adafruit LiIon/LiPoly Charger BFF (assembled and tested)
  • Headers for soldering to QT Py
Warning: For use with Adafruit LiPo/LiIon batteries only (3.7 V/4.2 V). Do not use with older 3.6 V/4.1 V cells or batteries with different chemistry, polarity, or pinout. Batteries and QT Py board sold separately.