Best Battery Backup for Modems
When the power drops, your modem is the first point of failure—and without it, your entire internet connection goes offline. A reliable battery backup keeps your modem powered during outages, brownouts, and voltage dips, so your home network stays online and your smart devices stay connected. This guide focuses on compact, low-wattage UPS units and DC battery packs that deliver clean, quiet power to cable and fiber modems without overkill.
Below is our top pick for most modem setups, followed by four additional options that excel in different scenarios. Each recommendation includes specs, pros and cons, and real-world review insights to help you choose the right backup for your modem.
🔋 APC BE600M1 – Best Overall Battery Backup for Modems
The APC BE600M1 is a compact standby UPS with 600VA of capacity, perfect for powering a modem and a router during outages. It includes five battery-backed outlets, two surge-only outlets, and a USB charging port. Runtime is excellent for low-draw devices, and the replaceable battery means long-term reliability without throwing the unit away.
Key Specs
- Capacity: 600VA / 330W
- Waveform: Standby topology
- Features: USB port, wall-mountable design, replaceable battery
- Best for: Modem + router combos
Pros
- Excellent runtime for modem-only loads
- Trusted APC reliability and support
- Wall-mountable and compact
- Battery is user-replaceable
Cons
- No LCD screen
- Standby topology lacks AVR
Customer Review Highlights
Users consistently praise the BE600M1 for keeping their internet online during outages. Many mention that it powers both modem and router for hours, and several note that the USB port is handy for charging phones during emergencies.
More Great Battery Backups for Modems
Modems typically draw 8–12 watts, so even small UPS units can keep them running for hours. The options below are compact, efficient, and optimized for modem-only or modem + router setups.
📡 SKE SMART KEY ENERGY 625VA UPS
The SKE SMART KEY ENERGY UPS offers 625VA of capacity with simulated sine wave output, making it ideal for sensitive networking gear. It includes USB-A, USB-C, and RJ45 surge protection ports, plus a replaceable battery for long-term use.
Specs
- 625VA / 360W
- Simulated sine wave
- Multiple USB and DC ports
Pros
- Stable power for sensitive modems
- Replaceable battery
- Compact and quiet
Cons
- Not widely available in all regions
- Higher price than basic models
🔋 Mini UPS 15000mAh DC Battery Pack
The Mini UPS 15000mAh is a DC battery backup that powers modems directly via barrel plug or USB. It’s silent, compact, and delivers long runtime without the inverter losses of traditional UPS units.
Specs
- 15000mAh lithium battery
- DC output: 5V, 9V, 12V
- USB ports for charging
Pros
- Ultra-long runtime for modems
- Silent operation
- Compact and portable
Cons
- Not compatible with AC-only modems
- No surge protection
🌐 APC BE425M UPS
The APC BE425M is a slim, wall-mountable UPS with 425VA of capacity, perfect for modem-only setups. It’s compact, quiet, and includes four battery-backed outlets plus two surge-only outlets.
Specs
- 425VA / 225W
- Standby topology
- Wall-mountable design
Pros
- Ideal for modem-only loads
- Compact and easy to mount
- Trusted APC reliability
Cons
- Limited capacity for router + modem combos
- No USB ports
💡 Amazon Basics UPS 400VA
The Amazon Basics 400VA UPS is a budget-friendly option for modem-only setups. It’s simple, compact, and provides enough runtime to keep your internet alive during short outages.
Specs
- 400VA / 255W
- Standby topology
- LED indicators
Pros
- Very affordable
- Great for basic modem protection
- Small footprint
Cons
- No LCD screen
- Shorter runtime than premium units
