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Amazon Basics Standby UPS 400VA 255W Surge Protector Battery Power Backup, 6 Outlets - Black

TLDR Review: Amazon Basics 400VA UPS

Item: Amazon Basics 400VA UPS
Author: ShopSavvy

By ShopSavvy Team

Published: January 26th, 2026

Pros

•Provides about 1 hour and 45 minutes of backup power for modem, router, and mesh network units, helping to maintain internet during outages.
•Allows a brief window to properly shut down devices or wait for generator power without losing internet connectivity.
•Simple plund-play installation with no complicated setup needed.
•Works smoothly with fiber internet systems and mesh networks like Amazon EERO.
•Helps avoid interruptions from short power surges or blackouts that typically cause internet loss.
•Communicates effectively with QNAP T30 NAS devices, supporting configurable automatic shutdowns and better power management.
•Includes 12 total outlets—6 with battery backup and 6 surgrotected—reducing the need for extra power strips.
•Uses a common 12V 9Ah battery, making replacements affordable and easy to find.
•Built by CyberPower, a trusted brand known for reliable UPS units and software support.
•Performs as well as or better than more expensive UPS brands, making it a solid value choice.

Cons

•Lacks an LCD display found on some competing models, which shows reaime status and diagnostics.
•Full automatic shutdown and restart features work mainly with Windows; compatibility issues arise with noindows servers like UnRaid, requiring manual restarts.
•Does not automatically turn on after the battery completely drains, which means manual power cycling is necessary at times.
•Runtime (~50 minutes for light PC usage) may be insufficient for users with higher power demands or longer outages.
•Best suited for low power draw devices; it isn’t ideal for running large electronics or higattage equipment continuously.

Bottom Line

The Amazon Basics Standby UPS 400VA is a budget-friendly, reliable option for keeping your internet gear and small electronics running during outages, especially if you have fiber or mesh networks. It shines in providing solid backup for modems, routers, and NAS setups, with the peace of mind of CyberPower’s trusted hardware inside. However, if you need more detailed status info or full compatibility with non-Windows servers, you might want to consider more feature-rich UPS models. Overall, this one is a smart buy for everyday home use where moderate backup power is enough.