The 3.7V/5V to 9V Boost Converter Module is a compact, multi-functional power board designed specifically for modifying multimeters and other devices that require a stable 9V supply. It integrates 18650 lithium battery charging, boost voltage conversion, and discharge management into a single board, making it an ideal solution for replacing traditional 9V batteries with a rechargeable 18650 cell. The module also serves as a general-purpose boost converter for a wide range of portable electronics projects.
At the heart of the module is a high-efficiency boost converter that steps up the input voltage from either a 3.7V lithium battery or a 5V USB source to an adjustable output of up to 9V (or higher, depending on the configuration). The output voltage is set via an onboard potentiometer, allowing precise adjustment for your specific device requirements. The module can deliver up to 2A of output current, providing ample power for multimeters, portable instruments, and other 9V-powered devices.
The board features integrated 18650 lithium battery charging via a Micro USB input, allowing you to recharge the battery without removing it from the device. The charging circuit includes overcharge protection and charge status indication through onboard LEDs. This makes the module a complete, self-contained power solution — charge the battery, boost the voltage, and power your device, all from a single compact board.
The module includes discharge management with over-discharge protection, preventing the lithium battery from being drained below a safe voltage. This protects the battery and extends its lifespan, making the module suitable for long-term installations.
The compact form factor is designed to fit inside multimeter battery compartments and other tight spaces. The screw terminals or solder pads provide secure connections for the battery, input power, and output load. The module is widely used for multimeter modifications, portable instrument power, DIY power banks, and battery-powered projects requiring a stable 9V supply.
Whether you are upgrading a multimeter to rechargeable power, building a portable 9V power supply, or designing a custom battery-powered device, this Boost Converter Module provides a complete, efficient solution. It is suitable for individual makers, students, and businesses purchasing in bulk for product development or educational programs.
Features
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3.7V/5V to 9V boost conversion — Adjustable output voltage via onboard potentiometer
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2A maximum output current — Ample power for multimeters and portable instruments
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Integrated 18650 lithium battery charging — Micro USB input for convenient recharging
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Discharge management — Over-discharge protection extends battery lifespan
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Charge status indication — Onboard LEDs show charging and full-charge status
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Compact form factor — Designed to fit inside multimeter battery compartments
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Multi-function design — Charging, boosting, and discharge management on one board
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Adjustable output — Potentiometer allows precise voltage setting
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Secure connections — Screw terminals or solder pads for reliable wiring
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Wide application range — Multimeter mods, portable instruments, DIY power banks
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | Input Voltage | 3.7V (lithium battery) or 5V (Micro USB) |
| 2 | Output Voltage | Up to 9V (adjustable) |
| 3 | Maximum Output Current | 2A |
| 4 | Battery Type | 18650 lithium-ion |
| 5 | Charging Input | Micro USB, 5V |
| 6 | Charging Management | Overcharge protection, status LEDs |
| 7 | Discharge Management | Over-discharge protection |
| 8 | Board Dimensions | Compact form factor for multimeter compartments |
