DIY UPS Power Bank Box | 5V 9V 12V Output | 6× 18650 | Router & CCTV Backup

Keep Your Router, Modem and Cameras Running During Power Cuts

A compact DIY UPS (Uninterruptible Power Supply) battery box that uses 6× 18650 batteries to provide automatic backup power for routers, modems, CCTV cameras, and other low-power devices. No soldering required — plug and play setup.

Why You'll Love It

• 3 output voltages — 12V 3–5A, 9V 1A, and USB 5V 2–3A simultaneously
• Automatic UPS switching — seamlessly switches to battery when mains power fails, no manual intervention needed
• Up to 60W peak output — suitable for routers, modems, IP cameras, LED lights, and audio systems
• No soldering required — solder-free spring contacts for easy 18650 battery installation
• Built-in protection — overcharge (4.25V), over-discharge (2.75V), and overcurrent protection
• Wide temperature range — operates from -20°C to 60°C

Technical Specifications

• Battery: 6× 18650 flat-head batteries (not included)
• Max battery capacity: 6 × 3.7V × 3400mAh = 74Wh
• Output: 12V 3–5A / 9V 1A / USB 5V 2–3A
• Peak output power: 60W
• Charger input: 12–13V DC adapter (not included)
• DC connector: 5.5×2.1mm (centre positive)
• Overcharge protection: 4.25V × 3
• Over-discharge protection: 2.75V × 3
• Operating temperature: -20°C to 60°C

Typical Applications

• Router and modem backup during power cuts
• CCTV and IP camera continuous power
• LED lighting systems
• Audio systems and solenoid valves
• DIY power bank projects

Important Notes

• Use flat-head 18650 batteries only — sharp-head batteries exceeding 2mm in length are not compatible
• Spring contacts = negative terminal; copper plate = positive terminal. Do not reverse — incorrect installation may cause damage
• Use matched batteries with consistent parameters for best performance
• Batteries and power adapter are not included

In the Box

1× Solder-free battery box, 1× 0.3m output cable