4-in-1 3.7V to 5V Power Supply Module

Stop faffing about with separate boards for charging, boosting, and protection. This 4-in-1 DC-DC boost converter handles the lot. Designed for the cynical pro who needs a dead-reliable DIY mobile power supply without the extra bulk. It takes your standard 3.7V lithium-ion battery (18650 or 14500) and steps it up to a clean 5V. Built-in overcurrent, overvoltage, short-circuit, and over-temperature protection means your prized 18650s won't turn into a spicy pillow. Sorted.

Highlights

• All-in-One Design: Combines charging, discharging, boosting, and battery protection in a 25.2 x 16mm footprint.
• Intelligent Output Control: Automatically turns on when a load is detected (>50mA) and shuts off after 30 seconds to save power.
• High Efficiency: Boasts a massive 96% discharge conversion efficiency to squeeze every drop of flight time from your cells.
• Charge/Discharge Simultaneously: Yes, you can use your device while charging the battery. Just don't use it for a UPS.

Why You Want It

Because space and weight matter. Whether you're building a custom FPV ground station, a portable Bluetooth audio amp, or powering an MCU dev board, this module gives you bulletproof 5V power without needing a separate BMS. At 2.3g, you'll forget it's even there.

Specs

• Brand: Generic
• Charge Voltage: DC 4.5V-5.5V (5V recommended)
• Charging Current: 0-2.1A
• Full Charge Voltage: 4.2V ±1%
• Discharge Current: 0-2.4A
• Output Voltage: 5V
• Output Current: 0-2.1A
• Conversion Efficiency: Up to 96%
• Quiescent Current: 100uA (Charge), 50uA (Discharge)
• Operating Temp: -20°C to +85°C
• Dimensions: 25.2 x 16 x 4mm
• Weight: 2.3g

FAQ

Can I use this as an Uninterruptible Power Supply (UPS)?

No. This module is explicitly not suitable for UPS applications. It is designed for standard DIY mobile power setups.

How do I turn off the boost output?

Give the button two consecutive short presses within 1 second. A single short press (>50ms, <2s) will turn on the battery indicator and boost output.

In the Box

• 1x 4-in-1 Boost Converter Module

#DIYElectronics #BoostConverter #LithiumBatteryCharger #18650Power