The DIY UPS Battery Box for 6x 18650 Cells 5V/9V/12V is a practical solution for building a compact backup power supply for small DC-powered devices.

It accepts up to 6 lithium 18650 batteries and provides multiple voltage outputs, including 5V USB, 9V DC and 12V DC, making it suitable for routers, modems/ONTs, surveillance cameras, small LED systems, network devices and other equipment requiring compatible DC power.

The solder-free design makes battery installation and replacement easier. The UPS function provides automatic charge and discharge management, keeping connected equipment powered when the main supply fails, provided that the input conditions and output power are suitable for the connected load.

This product is supplied as a UPS battery box / DIY kit, without batteries included. The final runtime depends on the capacity, quality, condition and matching of the 18650 cells used.

Main features

• DIY UPS / power bank box for 18650 batteries
• Holds 6x 18650 batteries
• Available outputs: 5V, 9V and 12V
• USB output: 5V
• DC output: 9V
• DC output: 12V
• Indicated peak power: up to 60W
• Solder-free assembly
• User-replaceable batteries
• UPS function with automatic charge/discharge management
• Charging indicator light
• 3-level battery status indicator
• Power switch
• Recommended DC input: 12–13V
• Standard DC connectors: 5.5 x 2.1 mm
• DC polarity: centre positive / outer negative
• Indicated operating temperature: -20°C to 60°C
• Supplied without batteries

Indicated specifications

• Compatible battery type: 18650 Li-ion 3.7V flat-top
• Number of batteries: 6 cells
• Indicated theoretical capacity with 6x 3400mAh cells: approx. 74Wh
• Indicated rated output power: 12V / 5A = 60W
• Independent 12V output: 3–5A
• 12V output in UPS mode: 1–3A, depending on input conditions
• 9V output: 1A
• USB 5V output: 2–3A
• Recommended input: 12–13V DC / 2A or higher
• Overcharge protection: 4.25V x 3
• Low-voltage protection: 2.75V x 3
• DC interface: 5.5 x 2.1 mm

Package contents

• 1x Solder-free DIY UPS battery box for 6x 18650 cells
• 1x DC cable, approximately 0.3 m
• Batteries not included

Recommended applications

• Wi-Fi router
• Modem / ONT / fibre terminal
• Surveillance camera
• Small network devices
• DC LED lighting
• DIY electronics projects
• Low-voltage backup power systems
• Devices powered by 5V, 9V or 12V DC
• Test bench and portable power projects

Important battery note

This product does not include batteries. Use good-quality 18650 Li-ion flat-top cells, preferably with the same brand, model, capacity, batch and charge level. The supplier indicates that cells with a raised positive terminal longer than 2 mm may not be compatible.

Safety warning

Always check polarity before installing the batteries. The spring is the negative terminal and the copper contact is the positive terminal. Installing batteries in reverse may damage or burn the product. Also confirm that the output voltage and current are compatible with the connected device. This product is not a 230V AC UPS; it is a DC backup power solution for compatible equipment.