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Head-to-head · Best UPS Battery Backups

Eaton 5E 850LI vs Eaton 5P 1550

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

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The short answer

Eaton 5P 1550 comes out ahead by a clear margin (2.0 vs 4.5). The gap is mostly about data center users needing rackmount protection — read the strengths below before deciding.

Eaton 5E 850LI
Ranked #6 in Best UPS Battery Backups
Eaton 5E 850LI
2 sources1 derived$25as of Jun 28

The Eaton 5E 850LI is a line-interactive UPS for home and small office use, with AVR and a wide voltage tolerance backing up its electrical protection. Reviews report it handles power fluctuations reliably and offers USB monitoring, though some users hit inconsistent USB detection and poor customer service. The backup function itself is solid; the USB interface and the support behind it are what draw criticism. It fits anyone who wants basic UPS protection without complex monitoring needs.

Strengths
  • — Line-interactive topology with Automatic Voltage Regulation (AVR) that corrects under and over voltage without switching to battery
  • — Wide input voltage tolerance of 140–300V with 50/60Hz auto-sensing capability
  • — HID-compliant USB interface for seamless OS-level monitoring without proprietary drivers
Watch-outs
  • — USB control is reported as flaky and unreliable by users
  • — Issues with computer detection of the UPS despite NUT support
  • — Customer service response was described as tedious and unhelpful
$25 · Check Price on AmazonFull review →
Eaton 5P 1550
Higher ratedRanked #1 in Best UPS Battery Backups
Eaton 5P 1550
2 sources1 derived$760as of Jul 31

The Eaton 5P1550GR is a rackmount UPS for data center environments, rated 1550 VA / 1100 W with true sine wave output. Reviewers noted the compact 1U form factor and the 6 C13 outlets, which can be grouped programmatically so critical and non-critical equipment are handled separately. ABM battery management extends battery life and warns you ahead of a replacement. Performance is solid for the class, though swapping the battery is on the user and the included power cord runs only 6 feet. It fits anyone who needs dependable rackmount power protection.

Strengths
  • — 1U rackmount form factor with compact footprint suitable for data center environments
  • — True sine wave output waveform for reliable power delivery to sensitive equipment
  • — 6 C13 outlets with programmable groups for critical and non-critical device management
Watch-outs
  • — Battery replacement requires user intervention and is not plug-and-play
  • — Limited runtime options without extended battery capability
  • — Power cord is only 6-foot length which may require additional cable management
$760 · Check Price on AmazonFull review →

Derived means the reviewer published no score, so one was inferred from their written verdict. Everything else is a number the publisher printed. How we rank.

How they stack up

Eaton 5E 850LI

The Eaton 5E 850LI provides wide input voltage tolerance and HID-compliant USB interface, features not found in the APC Back-UPS 600VA. However, it suffers from unreliable USB control and poor customer service, unlike the more reliable Tripp Lite OMNI 1500LCD which offers better software support and consistent performance.

Eaton 5P 1550

The Eaton 5P 1550 offers a 1U rackmount form factor and true sine wave output, features not available in the Tripp Lite OMNI 1500LCD. However, it requires user intervention for battery replacement and has a shorter power cord compared to the more user-friendly APC Back-UPS Pro 1500VA.

Specs side-by-side

SpecEaton 5E 850LIEaton 5P 1550
VA Rating850 VA / 450 W1550 VA
Battery TypeSealed lead-acidSealed, lead-acid
Input Voltage140–300V230V default (200/208/220/230/240V)
Dimensions17.32"D x 9.25"W x 12.6"H—
TopologyLine-InteractiveLine-interactive
WaveformTrue Sine WaveTrue Sine Wave
Voltage230 volts120 volts
MaterialMetalMetal
Wattage—1100 W
Outlets—6 C13
Runtime—upwards of 70 minutes
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