CyberPower ST425 Standby UPS vs CyberPower EC850LCD Ecologic UPS
Does the ST425’s lower 260 W rating cover the connected load, or does the EC850LCD’s 510 W rating and additional battery-backed outlets better fit the setup, and what do the runtime figures actually establish?
Products compared
ASIN B07GZR981Y
CyberPower ST425 Standby UPS
Your connected load stays within 260 W, four battery-backed outlets are enough, and the ST425’s runtime at your actual load meets your shutdown target.
Last observed offer
$59.95
List Price: $64.95
- Confirm offer eligibility on Amazon
Size: 425VA
Price checked
Observed condition: new. Coupon and subscription requirements unverified.
ASIN B00DBAA696
CyberPower EC850LCD Ecologic UPS
Your measured load exceeds 260 W but remains within the EC850LCD’s 510 W rating, subject to checking runtime at that load.
Last observed offer
$119.95
List Price: $129.95
- Confirm offer eligibility on Amazon
Size: 850VA LCD
Price checked
Observed condition: new. Coupon and subscription requirements unverified.
Prices are per listed package. Pickoryx may earn a commission from qualifying purchases through the paid Amazon links on this page, at no added cost to you.
Published by Pickoryx · Published 2026-10-16 · Source checked 2026-10-16 16:57 UTC
The main trade-off
The EC850LCD has a higher rated output, two more battery-backed outlets, an LCD, and a USB-dependent ECO workflow; the ST425 has a lower output ceiling and a simpler documented status indicator. The published runtime points use different product-relative loads and do not establish a same-watt runtime winner.
Quick verdict
Start with the equipment’s measured watt draw: the ST425 is rated for 260 W and the EC850LCD for 510 W. Their published half-load and full-load runtimes are based on different watt levels, so they do not show which lasts longer at the same connected load. Then count the outlets that must remain battery-backed: four on the ST425 and six on the EC850LCD.
Choose CyberPower ST425 Standby UPS if
- Your connected load stays within 260 W, four battery-backed outlets are enough, and the ST425’s runtime at your actual load meets your shutdown target.
- You only need the power-on LED status listed in the ST425 data sheet and do not need the EC850LCD’s documented LCD/ECO workflow.
Choose CyberPower EC850LCD Ecologic UPS if
- Your measured load exceeds 260 W but remains within the EC850LCD’s 510 W rating, subject to checking runtime at that load.
- You need up to six battery-backed outlets, want the EC850LCD’s multifunction LCD, or want its USB-linked ECO control for peripherals on the surge-only ECO outlets.
When the recommendation changes
- The measured connected watt draw or required shutdown window falls outside the selected model’s published load/runtime information.
- The number of devices that require battery backup changes, or the buyer does not want the EC850LCD’s USB-dependent ECO behavior.
The differences that matter
| Decision point | CyberPower ST425 Standby UPS | CyberPower EC850LCD Ecologic UPS |
|---|---|---|
| Load Rating And Runtime Points | 425 VA / 260 W; 6 minutes at half load and 1.5 minutes at full load; half rated watt load is 130 W.[1] | 850 VA / 510 W; 7.9 minutes at half load and 2.3 minutes at full load; half rated watt load is 255 W.[2] |
What this changes: The output rating screens for load fit; the separate model-relative runtime points do not prove a same-load runtime winner.[1, 2] The better fit depends on your priorities | ||
| Outlet Allocation | 8 NEMA 5-15R outlets total: 4 battery-and-surge protected and 4 surge-only.[1] | 12 NEMA 5-15R outlets total: 6 battery-and-surge protected and 6 surge-only; 3 of the surge-only outlets are ECO-controlled.[2] |
What this changes: Only the backed outlets keep supplying battery power in an outage; outlet totals alone overstate the number of backed connections.[1, 2] Best fit: CyberPower EC850LCD Ecologic UPS | ||
| Status Readout And Peripheral Control | Power-on LED indicator is listed; the cited data sheet does not specify an LCD or ECO-controlled outlet behavior.[1] | Multifunction LCD displays battery and power conditions; three surge-only outlets have ECO control that can automatically turn off connected peripherals when the computer is off/asleep, with USB connection required.[2] |
What this changes: The EC850LCD supplies a documented LCD/ECO workflow for buyers who want it; the ST425 document’s silence does not prove that the model lacks an undocumented function.[1, 2] The better fit depends on your priorities | ||
Best for your routine
A load within 260 W where four battery-backed outlets are sufficient
Best fit: CyberPower ST425 Standby UPS
Based on listed features, not comparative testing.
The ST425’s documented 260 W rating and four backed outlets cover this configuration if its runtime at the measured load also meets the user’s shutdown target.
A load above 260 W and no more than 510 W, after confirming the required runtime
Best fit: CyberPower EC850LCD Ecologic UPS
Based on listed features, not comparative testing.
The EC850LCD is the only assigned model with a published rating above 260 W, up to 510 W; its exact runtime at the buyer’s load remains to be checked.
A setup needing six battery-backed outlets or the LCD/ECO workflow
Best fit: CyberPower EC850LCD Ecologic UPS
Based on listed features, not comparative testing.
The EC850LCD documents six backed outlets, a multifunction LCD, and three USB-dependent ECO-controlled surge-only outlets.
Value and trade-offs
One or both observed offers have eligibility conditions, so no unrestricted price difference is shown.
Compare live offers only if the EC850LCD’s higher rated output, two additional battery-backed outlets, LCD, or ECO workflow matters to the setup.
No current offer or price history was evaluated, so this comparison makes no buy-timing recommendation.
Limitations
- These are manufacturer specifications, not Pickoryx runtime tests. No same-watt head-to-head runtime measurement or reliability comparison was conducted.
- The published half-load and full-load runtime figures use each model’s own rated load. They cannot be read as the two models’ runtime at the same watt draw; exact runtime at a buyer’s load remains unverified here.
- The assigned catalog identities map ASIN B07GZR981Y to ST425 and B00DBAA696 to EC850LCD; the manufacturer PDFs confirm those exact U.S. model names and 120 V / NEMA configuration but do not list Amazon ASINs or package contents. No bundle accessory claims are made.
- The EC850LCD document is a Cyber Power Systems (USA), Inc. manufacturer-origin brochure hosted on a third-party asset CDN; its U.S. scope is identified by the model, 120 VAC/NEMA specification, and copyright line.
- Current offer terms and price history were not evaluated. Confirm current offers separately before making a price-timing decision.
- The EC850LCD’s ECO-controlled outlets are surge-only and require USB connection for the automatic computer-off/sleep routine. Do not place equipment that must stay powered during an outage on those outlets.
- Both manufacturer data sheets specify simulated sine wave output. This comparison does not verify suitability for a particular device; check equipment-maker requirements if waveform compatibility matters.
Questions shoppers ask
Does 7.9 minutes versus 6 minutes mean the EC850LCD lasts longer at my load?
Not by itself. Those are half-load figures at different watt draws: about 255 W for half of the EC850LCD’s 510 W rating and 130 W for half of the ST425’s 260 W rating. Use the assigned model’s runtime information at your measured load; this comparison did not establish an equal-watt runtime result.
Which outlets stay on battery during an outage?
The ST425 data sheet lists four battery-and-surge outlets out of eight. The EC850LCD lists six out of twelve. Its other six are surge-only, including the three ECO-controlled outlets.
Does the EC850LCD ECO feature provide backup power to peripherals?
No. The brochure identifies the ECO-controlled outlets as surge-only. With a USB connection, the unit can switch those outlets off when the connected computer is off or asleep; use the six battery-backed outlets for devices that must remain powered during an outage.
Methodology and sources
Compared the exact model-level U.S. ratings and runtime points, battery-backed versus surge-only outlet allocation, and documented status/ECO workflow. No equal-watt runtime result was inferred from different relative-load benchmarks.
Automation organized the source-backed comparison; Pickoryx did not test either UPS or measure runtime.
View 2 sources
- 1.ST425 Standby UPS System — Data SheetCyber Power Systems (USA), Inc. (manufacturer document hosted on CyberPower CloudFront) · Official specifications · Source checked 2026-10-16 16:57 UTC
Evidence used on this page
- pp. 1–2: capacity, half/full-load runtime, NEMA outlet counts, 120 VAC input/output, power-on LED; p. 3 copyright and manufacturer identity: The exact ST425 U.S. model data sheet specifies 425 VA/260 W, 6/1.5 minutes at half/full load, 4 battery-and-surge outlets plus 4 surge-only outlets, 120 VAC and NEMA 5-15 connectors, and a power-on LED indicator. The document identifies Cyber Power Systems (USA), Inc. and does not map the model to an Amazon ASIN or package contents.
- 2.EC850LCD Ecologic UPS — Manufacturer Brochure and SpecificationsCyber Power Systems (USA), Inc. (manufacturer-origin document hosted on a third-party asset CDN) · Official specifications · Source checked 2026-10-16 16:57 UTC
Evidence used on this page
- pp. 1–2: 850 VA/510 W, 7.9/2.3 minutes at half/full load, 120 VAC/NEMA 5-15, 6 battery-backed and 6 surge-only outlets including 3 ECO-controlled, USB requirement and LCD; p. 3 copyright: The document names the exact EC850LCD and specifies the U.S. 120 VAC/NEMA 5-15 configuration, 850 VA/510 W, 7.9/2.3 minutes at half/full load, 6 battery-backed and 6 surge-only outlets (3 ECO-controlled), multifunction LCD, and USB-dependent ECO behavior. It bears a Cyber Power Systems (USA), Inc. copyright line but is hosted on a third-party asset CDN; it does not map the model to an Amazon ASIN or package contents.