Adafruit
Adafruit Micro-Lipo Charger for LiPoly Batt with USB Type C Jack
The Adafruit Micro-Lipo Charger is a tiny, easy-to-use charger for single-cell 3.7V/4.2V lithium polymer and lithium ion rechargeable batteries. Simply plug ...
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The Adafruit Micro-Lipo Charger is a tiny, easy-to-use charger for single-cell 3.7V/4.2V lithium polymer and lithium ion rechargeable batteries. Simply plug a USB-C cable into any USB power source and connect your battery via the JST connector — two LEDs show charging status at a glance (red = charging, green = complete).
Charging uses a three-stage process: preconditioning, constant-current fast charge, then constant-voltage trickle charge to keep the battery topped up. The default 100 mA charge rate works safely with any battery size and USB port. For larger batteries (500 mAh+), solder the on-board jumper to increase the charge current to 500 mA.
Key Features
- USB-C Input – 5V charging from any USB-C cable and power source
- 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 PH for LiPo/LiIon batteries
- Breakout Pads – 0.1" pads for 5V, D−, D+, GND, and VBAT
- Compact Size – Small enough for desk use or permanent project mounting
Ideal For
- Charging LiPo/LiIon batteries for portable projects
- Wearable electronics with rechargeable batteries
- Desk-side battery charging station
- Embedding in projects for built-in charging capability
Package Contents
- 1× Adafruit Micro-Lipo Charger (assembled, ready to use)
Jargon buster
Plain-language definitions for the technical terms used above.
- breakout
- A breakout board carries a small or fine-pitched component and brings its connections out to standard, breadboard- and header-friendly pins. Describing a part as a breakout means it can be wired into a project without soldering directly to the component's tiny contacts.
- GND
- GND is the ground or reference connection (0 V) for a circuit. When connecting two devices together, their grounds must be joined so both agree on what counts as a low or high signal.
- JST PH
- A small keyed plug-and-socket connector with 2 mm pin spacing, often used for low-power electronics connections. You need the correct JST PH cable, and its current rating limits how much power should be passed through it.
- LiPo
- A LiPo (lithium polymer) battery is a rechargeable lithium battery widely used in portable projects because it is light and compact. LiPo cells need correct charging circuitry and careful handling to stay safe, so equipment that supports LiPo generally includes charging or protection hardware suited to that battery type.
- solder jumper
- A solder jumper is a small pair or group of pads on a circuit board that can be bridged or cut with solder to change a hardware setting. It matters because changing modes may require careful soldering rather than just changing software.
- USB-C
- USB-C is a small, reversible USB connector that can carry power, data and, on some devices, video over a single cable. The same connector can range from charging only to high-speed data, so the functions a given port actually supports vary.
- VBAT
- VBAT is a backup battery power pin used to keep a small part of a circuit, such as a real-time clock, running when the main power is off. It matters if your project needs to remember the time while the board is shut down.
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