Adjustable 2A 18650 Li-ion, Lipo Battery Charger Discharge Module

This module is a small single-cell lithium battery charging module which also includes a 1A step-up (boost) converter for powering a large range of applications. The module will charge most types of single cell (3.7) LiPo/Li-Ion batteries from either 4 to 8V power supply input or from a standard 5V USB port/adapter. A battery charge and standby LED is also included for visual indication.

Besides battery charging capabilities this module also includes an adjustable boost converter which is capable of stepping up the attached battery voltage from 4.5 to 27V with a maximum supply current of 2A.

Key Features:

1. Dual functionality: Battery charging and voltage boost conversion
2. Compatible with various single-cell Li-ion and LiPo batteries
3. Adjustable output voltage from 4.3V to 27V
4. USB and DC input options for charging
5. LED indicators for charge status monitoring
6. Compact size for easy integration into projects

Technical Specifications:

• Input voltage: 4.5V to 8V DC or 5V USB
• Output voltage: 4.3V to 27V DC (continuously adjustable)
• Charging voltage: 4.2V DC
• Charging current: Max. 1A
• Discharging current: Max. 2A
• Boost converter output: 5V 1.4A / 9V 0.8A / 12V 0.6A (max)
• Supported batteries: Single cell 3.7V LiPo / Li-Ion (18650, 18500, 14500)
• Dimensions: 33mm x 23mm (1.3″ x 0.91″)

Applications:

1. DIY power bank projects
2. Solar-powered device charging
3. Portable electronic devices
4. Battery-powered IoT projects
5. Adjustable power supply for various electronic components

Pinout Diagram:

    +-------------------------+
    |  [USB]   [Voltage Adj.] |
    |                         |
    | IN+ o   BAT+ o   OUT+ o |
    | IN- o   BAT- o   OUT- o |
    |                         |
    |  [Charge LED] [Done LED]|
    +-------------------------+

3.7V 4.2V Lithium Li-ion 18650 Battery Charger and Discharge Module connection

Setup Instructions:

Connection:

1. Connect the positive terminal of the Li-ion/LiPo battery to the BAT+ pin.
2. Connect the negative terminal of the battery to the BAT- pin.
3. For charging, connect a 5V power source to either the USB port or IN+/IN- terminals.
4. Connect your load to the OUT+/OUT- terminals for boosted voltage output.

Operation:

1. Insert a compatible single-cell lithium battery.
2. Connect a power source to either USB or IN terminals for charging.
3. The charge LED will illuminate during charging and turn off when complete.
4. Adjust the output voltage using the onboard potentiometer.
5. Connect your load to the OUT terminals to utilize the boosted voltage.

Caution:

• Always ensure correct battery polarity to prevent damage.
• Do not connect power to both USB and IN terminals simultaneously.
• A suitable LiPo battery must be connected for proper operation of the boost converter.
• Do not exceed the maximum current ratings for charging and discharging.
• Use in a well-ventilated area and avoid extreme temperatures.

Troubleshooting Tips:

1. No LED indicators: Check power connections and battery insertion.
2. Slow charging: Ensure the power supply can provide sufficient current (up to 1A).
3. No boost output: Verify battery connection and charge level.
4. Unexpected output voltage: Readjust the potentiometer for the desired voltage.
5. Overheating: Check for short circuits and reduce load if necessary.

FAQs:

1. Q: Can this module charge multiple batteries simultaneously?A: No, it’s designed to charge one single-cell battery at a time.
2. Q: Is it possible to use the boost converter without a battery connected?A: No, a suitable LiPo battery must be connected for proper operation.
3. Q: Can I use this module with a solar panel?A: Yes, you can connect a 5V solar panel to the VIN+ terminal for charging.
4. Q: What’s the maximum output current at different voltages?A: The module can supply 1.4A at 5V, 0.8A at 9V, and 0.6A at 12V.
5. Q: Can this module be used for battery capacity testing?A: While not its primary function, it can be used for basic capacity testing by monitoring discharge time at a known current.