CyberPower CP550SLG Standby UPS Battery Backup and Surge Protector
Bottom line: The CyberPower CP550SLG Standby UPS Battery Backup and Surge Protector ($77.95 on Amazon as of 2026-10-20 22:17 UTC): Eight NEMA 5-15R outlets: 4 battery backup plus surge, 4 surge-only; main trade-off: 330W usable ceiling rules out gaming PCs and multi-monitor workstations.
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*Price sourced from Amazon.com. Last updated 2026-10-20. Price and availability subject to change.
Pros & Cons
Pros
- ✓ Eight NEMA 5-15R outlets: 4 battery backup plus surge, 4 surge-only
- ✓ Four wide-spaced receptacles fit bulky wall-wart adapters
- ✓ HID USB port drives auto-shutdown on Windows, Linux, and macOS natively
Cons
- ✗ 330W usable ceiling rules out gaming PCs and multi-monitor workstations
- ✗ Simulated sine wave, not pure sine; some active PFC power supplies object
- ✗ Standby topology only switches on outage; no continuous voltage regulation
- ✗ LEDs show Power-On and Wiring Fault only, with no LCD load or runtime readout
Manufacturer description
The CyberPower CP550SLG Standby UPS gives your home office a buffer against the power problems that corrupt files and shorten hardware life. Rated at 550VA/330W, it uses simulated sine wave output to ride through surges, sags, brownouts, and short outages long enough for you to save your work and shut down cleanly. Eight NEMA 5-15R outlets split the job: four give you battery backup plus surge protection for the PC, monitor, and network gear that cannot lose power, while four more handle surge-only duty for printers, speakers, and chargers. Four of the receptacles are wide-spaced for bulky…
SpecPicks Verdict
SpecPicks scored CyberPower CP550SLG 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 long will the CP550SLG keep my PC running during an outage?
Runtime depends on your actual load against the 550VA/330W rating; a light office PC and monitor get minutes, not hours. This unit is designed to bridge brief outages and allow a clean shutdown, not to keep working through a long blackout.
Can this UPS handle a gaming PC with an RTX-class graphics card?
No. The usable ceiling is 330W, which a modern gaming PC exceeds under load. Use the CP550SLG for a home office desktop, networking gear, or retro and low-power systems, and step up to a higher-wattage model for a gaming rig.
Are all eight outlets battery backed up?
No. Four of the eight NEMA 5-15R outlets provide battery backup plus surge protection, and the other four are surge protected only. Put the PC and network gear on the backup side and printers or chargers on the surge-only side.
Does it work with Mac and Linux, or only Windows?
The USB port is HID compliant, so it integrates with the built-in power management and auto-shutdown features of Windows, Linux, and macOS. CyberPower also offers free PowerPanel Personal Edition software as a download.
What does the warranty cover, and is the battery included?
CyberPower lists a 3-year warranty that includes the battery, along with a connected equipment guarantee. Check the product listing for current terms, coverage limits and claim procedures before you buy.
Key Features
- 550VA/330W Standby Battery Backup Uninterruptible Power Supply (UPS) System uses simulated sine wave output to safeguard workstations, networking devices, and home entertainment equipment
- EIGHT NEMA 5-15R OUTLETS: Four battery backup & surge protected outlets; Four surge protected outlets; INPUT: NEMA 5-15P right angle, 45 degree offset plug with five foot power cord
- LED INDICATORS: LED status lights indicate Power-On and Wiring Fault
- USB CONNECTIVITY: HID compliant USB port enables full integration with built-in power management and auto-shutdown features of Windows, Linux and Mac OS X
- 3-YEAR WARRANTY – INCLUDING THE BATTERY; $100,000 Connected Equipment Guarantee and FREE PowerPanel Personal Edition Management Software (Download)
Full Specifications
| Brand | CyberPower |
|---|---|
| Color | Black |
| Runtime | 8 minutes |
| Voltage | 120 volts |
| Wattage | 330 watts |
| Amperage | 10 A |
| Unit Count | 1 Count |
| Form Factor | Compact |
| Connectivity | USB |
| Model Number | CP550SLG |
| Compatibility | Mac, Linux |
| Input Voltage | 120 volts |
| Maximum Power | 330 watts |
| Built-In Media | Item |
| Connector Type | NEMA 5-15P |
| Item Type Name | UPS Systems |
| LED INDICATORS | LED status lights indicate Power-On and Wiring Fault |
| Output Voltage | 120 volts_of_alternating_current |
| Output Wattage | 330 watts |
| Frequency Range | 50/60Hz ± 3Hz |
| Full listing title | CyberPower CP550SLG Standby UPS Battery Backup and Surge Protector | Surge Protector, 550VA/330W, 8 Outlets, UL Certified |
Ready to buy?
CyberPower CP550SLG Standby UPS Battery Backup and Surge Protector | Surge Protector, 550VA/330W, 8 Outlets, 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.
*Price sourced from Amazon.com. Last updated 2026-10-20. Price and availability subject to change.
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