The 5V/9V/12V Lithium Battery UPS Module combines lithium battery charging, battery protection, DC-DC boost conversion, and automatic UPS power switching in one compact module.
It is designed to provide continuous backup power for routers, cameras, development boards, IoT devices, and other compatible DC-powered equipment. When external 5V power is available, the module powers the connected load while charging the lithium battery. If external power is lost, it automatically switches to battery power to keep the connected device operating.
Selectable 5V, 9V, or 12V output makes the module suitable for a wide range of low-voltage backup power applications.
Key Features
- UPS backup power function
- Automatic external power/battery switching
- Selectable 5V, 9V, or 12V output
- Designed for 3.7V lithium-ion batteries
- Compatible with 18650 lithium-ion cells
- Integrated lithium battery charging
- Integrated battery protection
- Integrated DC-DC boost converter
- Up to 15W recommended output power
- Up to 20W peak power
- Boost conversion efficiency up to 96%
- Built-in high-current MOSFET
- Approx. 25mA module standby consumption
- Two-color charging status LED
- Automatic charging termination when battery is full
- Micro USB 5V power input
- Additional 5V+/5V- power input
- Overcharge protection
- Over-discharge protection
- Over-temperature protection
- Overcurrent protection
- Short-circuit protection with recovery
- Compact integrated design
Automatic UPS Operation
The module automatically manages the external power source and battery.
When External 5V Power Is Available
The external power source supplies the system while the module charges the connected lithium battery.
When External Power Fails
The battery automatically supplies the load through the boost converter.
When External Power Returns
The module returns to external power operation and automatically resumes battery charging.
This allows compatible devices to continue operating during short power interruptions.
Selectable 5V / 9V / 12V Output
The module supports three selectable output voltages:
The required output voltage must be correctly configured before connecting the load.
Recommended Output Capability
The practical output capability depends on the selected output voltage.
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5V Output: Up to approx. 3A
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9V Output: Up to approx. 1.6A
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12V Output: Up to approx. 1.2A
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Recommended Output Power: Up to 15W
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Peak Power: Up to 20W
For reliable continuous operation, keeping the load below 15W is recommended.
DC-DC Boost Converter
The integrated boost converter raises the voltage from the connected single-cell lithium battery to the selected output voltage.
The circuit is specified with:
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Conversion Efficiency: Up to 96%
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Recommended Power: ≤15W
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Peak Power: Up to 20W
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High-Current MOSFET: Built-in
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Static Power Consumption: Approx. 25mA
Actual efficiency and available output current depend on battery voltage, output voltage, load, wiring, cooling, and battery condition.
Lithium Battery Support
The module is designed for 3.7V lithium-ion batteries, including compatible 18650 cells.
A battery holder is provided on the applicable version of the module.
Other suitable 3.7V lithium-ion cells may also be connected using the correct battery terminals.
Increasing Battery Capacity
Battery capacity can be increased by connecting suitable matched 3.7V lithium-ion cells in parallel.
Parallel cells must have compatible chemistry, voltage, capacity, condition, and state of charge.
Do not connect lithium cells in parallel when they are at significantly different voltages.
Battery Protection
The module integrates lithium battery protection functions including:
- Overcharge protection
- Over-discharge protection
- Over-temperature protection
- Overcurrent protection
- Short-circuit protection
If the module enters protection mode and stops providing output, correct the fault first and then connect a suitable 5V charging source to reactivate the circuit.
Charging Status Indicator
The two-color LED provides battery charging status indication.
The supplied specifications indicate that the green LED remains on when charging is complete, after which charging automatically stops.
Indicator behavior may vary slightly depending on the module revision.
Power Connections
The module provides two options for the external 5V input:
- Micro USB Input
- 5V+ / 5V- Input Terminals
Use only one appropriate input connection as required.
The regulated UPS output is available through the terminals marked:
Always verify the PCB markings before connecting power or a load.
Technical Specifications
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Product Type: Lithium Battery UPS & Boost Converter Module
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UPS Function: Automatic External/Battery Power Switching
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External Input Voltage: 5V DC
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Input Interface: Micro USB / 5V+ and 5V-
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Battery Type: 3.7V Lithium-Ion
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18650 Battery Support: Yes
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Output Voltage: Selectable 5V / 9V / 12V DC
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5V Output Current: Up to Approx. 3A
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9V Output Current: Up to Approx. 1.6A
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12V Output Current: Up to Approx. 1.2A
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Maximum Current Claim: Up to 5A Peak Under Applicable Conditions
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Recommended Continuous Power: Up to 15W
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Peak Power: Up to 20W
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Conversion Efficiency: Up to 96%
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Static Power Consumption: Approx. 25mA
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Battery Charging: Integrated
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Battery Protection: Integrated
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Output Interface: UPS+ / UPS-
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Module Dimensions: Approx. 88 × 41 × 22mm
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Battery Holder: Rear-Mounted on Applicable Version
Typical Applications
- Wi-Fi routers
- IP cameras
- Security cameras
- Development boards
- Arduino projects
- ESP32 projects
- Raspberry Pi accessories and compatible low-power systems
- IoT devices
- Network equipment
- Embedded systems
- Alarm systems
- Monitoring equipment
- Robotics
- Portable electronics
- DIY UPS systems
- Battery backup projects
- 5V backup power
- 9V backup power
- 12V backup power
Important Power Supply Requirement
When using the module as a UPS, the 5V input power supply must provide enough current to operate the connected load and charge the battery at the same time.
An undersized 5V adapter may result in unstable operation, slow charging, voltage drop, or unwanted switching to battery power.
Important Battery Current Note
When generating 9V or 12V from a 3.7V battery, the battery-side current can be significantly higher than the output current.
For example, a 12V load does not mean the battery only supplies the same current at 3.7V.
Use lithium cells capable of safely delivering the required current and ensure all battery connections are secure.
UPS Switching Note
The module is designed for automatic backup switching. However, actual switching behavior can depend on the external 5V power supply.
Some power adapters contain large output capacitors that cause their voltage to decrease slowly after AC power is removed. This can delay detection of the power failure.
If this occurs, the supplied instructions recommend approximately a 1kΩ discharge resistor across the 5V input, where appropriate for the application.
Energy-Saving Option
The output indicator LED consumes a small amount of power.
According to the supplied information, removing or disabling the output indicator LED after testing can reduce power consumption by more than approximately 10mA.
This modification should only be performed by users experienced with PCB soldering.
Important Notes
- Confirm the required output voltage before connecting your device.
- Connecting a 5V device while the module is configured for 9V or 12V may permanently damage the device.
- Use only suitable 3.7V lithium-ion batteries.
- Observe correct battery polarity.
- Do not use damaged, swollen, leaking, or overheated lithium batteries.
- Use matched cells when connecting multiple batteries in parallel.
- Ensure the 5V input supply has sufficient current capacity.
- Keep continuous load power below approximately 15W for reliable operation.
- Provide adequate ventilation when operating at higher loads.
- Actual runtime depends on battery capacity, battery condition, selected output voltage, conversion efficiency, and connected load.
Package Includes
18650 battery, 5V power adapter, USB cable, enclosure, load device, and other accessories are not included.
