Amazon Basics UPS Battery Backup & Surge Protector, 400VA/255W, 6 Outlets, Uninterruptible Power Sup

This line of Cyber Power UPS works for about 5 years. After that the internal battery is unable to ride it through power surges. So long as you know that, it is a relatively inexpensive protection for all your computer stuff.

Miklos P. Kadar · 2026-04-26 · via amazon

Seems to be a quality unit...I needed a higher capacity for my old Windows home server and one other PC. Plenty of outlets. My only rub is the UPS software doesn't seem to run on my ancient WHS. Right now, it's not configured to shut down the server, but at least short outages should be easily handled. Also, it was reasonably priced and compact sized.

Todd B. · 2026-04-09 · via amazon

I bought the Amazon Basics UPS Battery Backup and Surge Protector, 600VA/360W, and so far it has been working great. It feels solid, is compact, and gives me extra peace of mind for keeping my electronics protected during power outages or short power flickers. I also have another one of these units, and so far so good with that one as well. I have even simulated power outages to test it, and everything worked great. Setup was simple, the outlets are useful, and it does exactly what I needed it to do. Overall, I am happy with this purchase. If anything fails or I run into any problems later, I will come back and update this review.

Matt · 2026-05-05 · via amazon

Item description is in its name - Basic. I have two - one dedicated to my Terramaster NAS and the other dedicated to my desktop PC. The user manual is helpful in setup and operation of the units. The software they tell you to download is free, but sketchy and not easy to use. My Windows 11 complained when I tried to install and use it; first I had to make an exception just to run the setup, then I had to make an exception to run the software; the software runs from a web browser and windows didn't like its certificate credentials. I ditched that software and downloaded CyperPower's Power Panel Personal software - also free for a single UPS. You can use their Cloud service for a very modest fee for personal use. Their software is a stand alone app, so no browser needed. The units themselves only have a USB port for communication. I have one plugged in to my PC and can monitor it anytime. The one for my NAS is plugged into one of its USB ports, but I don't have the same ability to monitor the UPS; Terramaster's software will alert me of power outages and lost communication, so that'll have to do. I've noticed other UPS systems have multiple ports for communication, so again - these UPS's are "Basic". I haven't seen them in action yet other than unplugging them while everything is running, but they seem to do the trick. They're also line interactive - they can "smooth out" minor power fluctuations without switching to the battery. I bought mine because we have weird power surges and outages that only seem to affect my immediate neighborhood - not often, but enough. Storm and weather outages are in addition to that. The UPS software has the ability to safely power down a connected PC when it switches to battery for a user defined amount of time. My Terramaster NAS software does the same, but on it's own accord - no configuration interface that I know of. I rated 4 stars because of the sketchy, browser based software. These UPS's are basic, but I knew what I was getting when I bought them and they're are doing the job. One last thing - Amazon shipped them separately and they were both shipped upside down in the shipping box. I sent them back because of that (and Amazon dropped the price after my purchase). The replacements they sent were also shipped upside down and the driver laid them on their sides to boot.

C. Stranathan · 2025-12-04 · via amazon

I never gave a 1 before, bt this product quite simply has a long history of failure. I researched it on ChatGPT, Claude & Gemini. The battery fails within a month & then it is rendered useless. Do not buy this product. Spend the money to buy a proper UPS: If your Amazon Basics UPS Battery Backup & Surge Protector (400VA/255W) isn’t holding power when the electricity goes out, it means the unit isn’t supplying backup power as it should. There are several possible reasons — some simple to fix, and others that indicate a hardware limitation or failure. Here are the most common causes and what you can check: ✅ 1. Battery Is Dead or Bad The most frequent cause of a UPS not holding power is a worn-out or failed internal battery. Why this happens UPS batteries are sealed lead-acid (SLA) and wear out over time (usually 3–5 years). If the UPS was stored discharged for a long time, the battery may be permanently damaged. Even new units can have a defective battery. What to check Press the power/test button — does it beep or indicate battery status? Some models flash an error code if the battery is bad. If available, check the battery replacement indicator. Solution: Replace the UPS battery (if the model allows it). For this Amazon Basics unit, replacement batteries are typically inexpensive and the case can open to swap the battery. ✅ 2. UPS Was Never Fully Charged If the UPS wasn’t charged long enough before use: It may not have stored enough energy. New units usually need several hours of charge before first use. Solution: Plug it in and let it charge overnight (8–12 hours), then test again. ✅ 3. Load Too High for the UPS Capacity A 400VA/255W UPS is relatively low power — it can handle: A small desktop computer A router/modem A few peripherals … but not high-power devices like: Large monitors Gaming PCs Laser printers Space heaters If the connected load exceeds 255W, the UPS may instantly go into overload protection and drop power. Solution: Reduce the load: Unplug everything except a single device. Test if it still fails. ✅ 4. UPS Is Old or Stored Without Power If the UPS wasn’t used for a long time: The internal battery sulfates and can’t hold charge. Some UPS units lock out battery use after long idle periods. Solution: Recharge it fully and test battery with reduced load — if still no backup time, the battery likely needs replacement. ✅ 5. The Unit Is Defective Sometimes UPS units have internal failures: Faulty battery charger circuit Bad connection between battery and electronics Internal fuse blown Signs of this: No lights or beeps on battery test UPS immediately shuts off when unplugged Strange behavior like rapid blinking Solution: If under warranty, contact Amazon for a return/replacement. ❌ 6. Surge Only Outlets vs. Battery Backup Outlets Some UPS units have two types of outlets: Battery Backup + Surge Protection Surge Protection Only If you plugged devices into the surge-only outlets, they won’t receive backup power when the power fails. Check: On the unit label, make sure your devices are plugged into the battery backup outlets, not the surge-only ones. Quick Troubleshooting Checklist ✔ Make sure device is plugged into the battery-backup outlets ✔ Let it charge for 8–12 hours ✔ Disconnect excess load — try just one device ✔ Press power/test button for status indication ✔ If still not working → likely battery replacement needed When to Replace the Battery Typical UPS batteries (sealed lead-acid) need replacement every 3–5 years. For this Amazon Basics model, replacing the battery is usually possible — the battery inside is a standard size and can be swapped. If you want, tell me: 🔹 What devices are plugged into the UPS 🔹 How old the UPS is 🔹 What the UPS lights/indicators show when the power fails …and I can help you diagnose the problem more precisely.

Bart Peluso · 2026-01-25 · via amazon

Best Buy

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MSI

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Newegg

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Newegg (Open Box)

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