Micro USB Li-Ion LiPo Battery Charger Module with JST Connector

Micro USB Li-Ion LiPo Battery Charger Module with JST Connector is an ultra-compact single-cell (3.7V/4.2V) lithium-polymer and lithium-ion battery charger board equipped with a pre-soldered 2-pin JST-PH 2.0mm battery receptacle. Built around the Microchip MCP73831 miniature linear charge management controller IC, this module performs three-stage battery conditioning (preconditioning trickle charge, constant-current fast charge, and 4.20V constant-voltage termination). A selectable onboard solder jumper allows switching between a safe 100mA default charge rate for miniature pouch cells and a 500mA fast-charge rate for larger batteries.

Key Features:

• Pre-Soldered 2-Pin JST-PH 2.0mm Socket: Plugs directly into standard 3.7V LiPo pouch batteries without stripping or soldering wires.
• Selectable 100mA / 500mA Charge Current: Default 100mA output safely charges tiny 100mAh–400mAh LiPo cells; bridging the onboard jumper boosts current to 500mA.
• Microchip MCP73831 Precision Controller: 3-stage preconditioning, constant-current, and constant-voltage regulation with ±0.75% voltage accuracy.
• Dual Status LEDs: Red LED indicates active charging; Green LED indicates charging complete and ready for use.
• Miniature Keychain-Sized PCB: Ultra-small footprint fits effortlessly inside wearable electronics, drones, and tiny IoT enclosures.

Technical Specifications:

• Charger Controller IC: Microchip MCP73831 Linear Charge Management Controller
• Input Voltage: 5.0V DC via Micro-USB or USB Contacts (3.75V to 6.0V range)
• Target Battery Chemistry: Single-Cell 3.7V Nominal LiPo / Li-Ion (4.20V Full Charge)
• Charge Termination Voltage: 4.20V ± 0.75%
• Charge Current: 100 mA Default (500 mA when onboard solder jumper is bridged)
• Battery Connector: 2-Pin JST-PH 2.0mm Pitch Right-Angle Receptacle
• Operating Temperature Range: -40°C to +85°C

Mechanical Specifications:

• PCB Material: FR-4 Double-Sided Gold-Plated Fiberglass PCB
• Input Port: SMD Micro-USB Female Connector + 5V/GND/BAT breakout pads
• Weight: Approximately 2.2 grams

Dimensions:

• Length: 21.0 mm
• Width: 19.0 mm
• Height: 6.5 mm (including JST socket)

Pinout and Wiring:

• Micro-USB Port / 5V & GND Pads: Connect to any standard 5V USB port or wall charger.
• JST 2-Pin Socket / BAT & GND Pads: Connect a 3.7V LiPo battery pack (Verify red wire (+) and black wire (-) polarity before plugging in).
• 500mA Current Jumper: Close the solder jumper pad on the PCB only when charging batteries rated 500mAh or higher.

Datasheet Reference:

• Refer to the Microchip MCP73831/2 Miniature Single-Cell, Fully Integrated Li-Ion, Li-Polymer Charge Management Controller Datasheet.

Commonly Used in:

• Small 100mAh, 250mAh, 300mAh, 500mAh, and 1000mAh 3.7V LiPo pouch batteries
• Wearable electronics, e-textiles, and LilyPad/Adafruit Gemma portable projects
• Micro quadcopters, indoor RC gliders, and miniature robotics
• Compact Bluetooth beacons, GPS trackers, and medical sensor prototypes

Applications:

• Low-Capacity LiPo Charging: Safely charging small pouch cells at 100mA where a 1A TP4056 charger would overheat or damage the cell.
• Plug-and-Play JST Battery Maintenance: Quick desktop USB charging for JST-terminated LiPo packs.

Equivalent Models:

• TP4056 1A Li-Ion Charger Module: Higher-current (1000mA) charger module suited for larger 18650 cells (≥1000mAh).
• CN3065 Mini Solar LiPo Charger: JST-equipped single-cell LiPo charger optimized for 4.4V–6V solar panel inputs.

Package Includes:

• 1 × Micro USB Li-Ion LiPo Battery Charger Module with JST Connector