The Adafruit Micro Lipo is a tiny USB charger for single-cell 3.7V/4.2V lithium polymer and lithium ion rechargeable batteries. Its gold-plated PCB-style USB connector plugs directly into any USB port — connect your battery via the JST plug and charging begins automatically. Two LEDs indicate status: red for charging, green for complete. For a USB-C version, see the Micro-Lipo Charger with USB-C.

Charging uses a three-stage process: preconditioning, constant-current fast charge, then constant-voltage trickle charge. The default 100 mA charge rate works safely with any battery size. For larger batteries (500 mAh+), solder the jumper on the back to increase the charge current to 500 mA.

Key Features

• PCB-Style USB Connector – Plugs directly into any standard USB-A port
• Three-Stage Charging – Preconditioning, constant-current, and trickle charge
• 100 mA Default Charge Rate – Safe for all battery sizes; adjustable to 500 mA via solder jumper
• Dual Status LEDs – Red (charging) and green (complete)
• JST Battery Connector – Standard 2-pin JST for LiPo/LiIon batteries
• Ultra-Compact – Small enough to fit inside any project enclosure

Ideal For

• Charging LiPo/LiIon batteries for portable projects
• Wearable electronics with rechargeable batteries
• Embedding in project enclosures for built-in charging
• Quick battery top-ups from any USB-A port

Package Contents

• 1× Adafruit Micro Lipo Charger v1 (assembled and tested)
• 1× 2-pin JST cable (bonus)