CyberPower ST425 vs EC850LCD: Which Fits Your Load and Backup Needs?
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.
Published by Pickoryx · Published 2026-10-16
Source checked 2026-10-16 16:57 UTC
Products compared
Product A · ASIN B07GZR981Y
CyberPower ST425 Standby UPS
Last observed offer
$59.95 List Price: $64.95
Per listed package.
Offer eligibility must be confirmed on Amazon.
Checked 2026-10-19 13:00 UTC. Price and availability may change.
Product B · ASIN B00DBAA696
CyberPower EC850LCD Ecologic UPS
Last observed offer
$119.95 List Price: $129.95
Per listed package.
Offer eligibility must be confirmed on Amazon.
Checked 2026-10-19 13:00 UTC. Price and availability may change.
Pickoryx may earn a commission from qualifying purchases through the paid Amazon links on this page, at no added cost to you.
The buying question
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?
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
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
Load Rating And Runtime Points
CyberPower ST425 Standby UPS
425 VA / 260 W; 6 minutes at half load and 1.5 minutes at full load; half rated watt load is 130 W.[1]
CyberPower EC850LCD Ecologic UPS
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]
Outlet Allocation
CyberPower ST425 Standby UPS
8 NEMA 5-15R outlets total: 4 battery-and-surge protected and 4 surge-only.[1]
CyberPower EC850LCD Ecologic UPS
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]
Status Readout And Peripheral Control
CyberPower ST425 Standby UPS
Power-on LED indicator is listed; the cited data sheet does not specify an LCD or ECO-controlled outlet behavior.[1]
CyberPower EC850LCD Ecologic UPS
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]
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.