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CyberPower ST625U Standby UPS Battery Backup and Surge Protector, 625VA/360W, 8 Outlets, 2 USB Charging Ports, Compact, UL Certified

CyberPower ST625U Standby UPS Battery Backup and Surge Protector

Bottom line: The CyberPower ST625U Standby UPS Battery Backup and Surge Protector ($79.95 on Amazon as of 2026-10-20 22:17 UTC): 625VA/360W backup rides out blackouts long enough for a graceful shutdown; main trade-off: simulated sine wave, not pure sine, so some active-PFC PSUs may object.

$79.95

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By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014. For retro PC hardware and period-correct parts, synthesises manufacturer documentation, community compatibility lists and marketplace listings rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference.

*Price sourced from Amazon.com. Last updated 2026-10-20. Price and availability subject to change.

Pros & Cons

Pros

  • ✓ 625VA/360W backup rides out blackouts long enough for a graceful shutdown
  • ✓ 8 NEMA 5-15R outlets: 4 battery-backed plus surge, 4 surge-only
  • ✓ 3-year warranty that covers the battery, not just the electronics
  • ✓ Two USB ports share 2.1A for phones and tablets, no wall brick needed

Cons

  • ✗ Simulated sine wave, not pure sine, so some active-PFC PSUs may object
  • ✗ 360W ceiling rules out gaming PCs with high-draw GPUs on battery
  • ✗ Standby topology switches over instead of always conditioning power
  • ✗ 5-foot cord limits placement to outlets near the desk

Manufacturer description

The CyberPower ST625U keeps your desk running when the power doesn't. This standby UPS delivers 625VA/360W of simulated sine wave backup, enough to carry a PC, router, or console through a blackout and give you time for a graceful shutdown instead of a hard crash and a corrupted drive. Eight NEMA 5-15R outlets split the work: four combine battery backup with surge protection for your critical gear, and four handle surge-only duty for printers, lamps, and speakers. Two USB ports share 2.1 amps so a phone or tablet charges from the same brick. GreenPower efficiency design uses a compact…

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SpecPicks Verdict

SpecPicks scored CyberPower ST625U Standby UPS Battery Backup and Surge Protector using a rating × review-volume × price-fit model applied to published specs and reviews across the power protection category. Compare with similarly-priced alternatives in the power protection category before committing. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for power protection of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Frequently Asked Questions

How much gear can the CyberPower ST625U actually run on battery?

It supplies 625VA/360W, sized for a home office PC, router, modem, or console. Only four of the eight outlets are battery-backed; the other four are surge protection only.

Is the ST625U a pure sine wave UPS?

No. It uses simulated sine wave output. That works for most home office and entertainment gear, but confirm compatibility if your power supply specifically requires pure sine wave.

What does the warranty cover?

CyberPower lists a 3-year warranty that includes the battery, plus a Connected Equipment Guarantee. Check the product listing for current terms and claim requirements.

Can I charge my phone from it?

Yes. Two USB charging ports share a 2.1 amp total output for tablets, smartphones, and other mobile devices, so one high-draw device gets the full 2.1A.

Is it safe to plug expensive equipment into it?

It is UL safety certified and tested in a UL certified lab. LED indicators warn you of power-on status and wiring faults.

Key Features

  • 625VA/360W Standby Uninterruptible Power Supply (UPS): Uses simulated sine wave output to provide battery backup power and to safeguard home office, home entertainment including computers, gaming consoles, and broadband routers
  • 8 NEMA 5-15R OUTLETS: Four battery backup & surge protected outlets; Four surge protected outlets; INPUT: NEMA 5-15P plug with 5 foot power cord
  • 2 USB CHARGING PORTS: Share 2.1 amps to charge and power tablets, smartphones, MP3 players, and other mobile devices; LED STATUS LIGHTS: indicates Power-On and Wiring Fault
  • GREENPOWER UPS HIGH EFFICIENCY DESIGN: Reduces power consumption by utilizing a compact charger and power inverter to create an ultra-efficient backup power system for home and office use
  • 3-YEAR WARRANTY – INCLUDING BATTERY; Connected Equipment Guarantee up to 100,000; PowerPanel Management Software (Available for Download); UL SAFETY CERTIFIED: Product has been tested in a UL certified lab and listed with UL as meeting or exceeding safety standards

Full Specifications

BrandCyberPower
ColorBlack
Runtime2 minutes
Voltage120 Volts
Wattage360 watts
Amperage3 Amps
Unit Count1.0 Count
Form FactorCompact
ConnectivityUSB
Model NumberST625U
Input Voltage120 Volts (AC)
Maximum Power330 Watts
Built-In MediaPS System^ User Manual^ USB A+B Type Cable
Connector TypeNEMA 5-15P, NEMA 5-15R, USB
Item Type NameUninterrupted Power Supply
Output Current3 Amps
Output Voltage120 Volts (AC)
Output Wattage360 Watts
Frequency Range47 – 63 Hz
Item Dimensions3.2 x 9.8 x 5.8 inches
Full listing titleCyberPower ST625U Standby UPS Battery Backup and Surge Protector, 625VA/360W, 8 Outlets, 2 USB Charging Ports, Compact, UL Certified

Ready to buy?

CyberPower ST625U Standby UPS Battery Backup and Surge Protector, 625VA/360W, 8 Outlets, 2 USB Charging Ports, Compact, UL Certified is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

Buy on Amazon — $79.95

*Price sourced from Amazon.com. Last updated 2026-10-20. Price and availability subject to change.

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CyberPower ST625U Standby UPS Battery Backup and Surge Protector, 625VA/360W, 8 Outlets, 2 USB Charging Ports, Compact, UL Certified
$79.95
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