Eaton 5P 1U Lithium Ion Rack Battery Unit Review 5P1500R-L

Eaton 5P 1500 R Li Ion 1U Front Open
Eaton 5P 1500 R Li Ion 1U Front Open

The Eaton 5P 1U battery backup unit we are reviewing today does something different. Specifically, it puts lithium-ion batteries in a rackmount form factor to provide battery backup and true sine wave capabilities. One of the more interesting areas in the data center is becoming, of all things, power. For years this was an area that many did not care about, but changing server power needs are making many re-evaluate rack power and redundancy options. As such, many racks need to figure out how to fit more dense battery backup capacity, and that is pushing the case for lithium-ion batteries. The model we are looking at is the 5P1500R-L but we are just going to call it the Eaton 5P for brevity.

Eaton 5P 5P1500R-L Hardware Overview

As is the custom with STH reviews, we are going to look at the external hardware, then the internal hardware, before we get to management and features. As one will note, we have a bit of a different set for this new series of reviews, this being the first in the set. We are using a Pelican-Hardigg composite rackmount case that we will be using in December for a project, but it looks very cool so it made its way into this batch of photography.

Eaton 5P 5P1500R-L External Hardware Overview

When one gets the Eaton 5P the battery is in the disconnected state. This is common for battery units for shipping. Unlike some other options, this is exposed directly out of box so one does not have to remove panels or do any disassembly before servicing the battery.

Eaton 5P 1500 R Li Ion 1U Front Out Of Box
Eaton 5P 1500 R Li Ion 1U Front Out Of Box

One needs to connect the battery at this front terminal location as well as another wire harness.

Eaton 5P 1500 R Li Ion 1U Front Power Connected
Eaton 5P 1500 R Li Ion 1U Front Power Connected

One that is done, a black cover is placed over the wires to protect this connection.

Eaton 5P 1500 R Li Ion 1U Front With Left Cover
Eaton 5P 1500 R Li Ion 1U Front With Left Cover

Finally, we get a blue faceplate that snaps into the middle. On the other side, we will note that there is a LCD screen that displays status information as well as a basic interface for the unit. There is also a power button to power on/off the unit. This solution felt basic but functional and intuitive.

Eaton 5P 1500 R Li Ion 1U Front With Middle Cover
Eaton 5P 1500 R Li Ion 1U Front With Middle Cover

On the rear of the system, we see a lot more going on.

Eaton 5P 1500 R Li Ion 1U Rear Without Network
Eaton 5P 1500 R Li Ion 1U Rear Without Network

First, and a very important feature is that we get five outlets. There are two labeled groups but also two different colors. The black outlets are designed for the critical equipment. Group 1 outlets and Group 2 outlets are programmable outlet groups.

Eaton 5P 1500 R Li Ion 1U Rear Outlets
Eaton 5P 1500 R Li Ion 1U Rear Outlets

The green connector is for ROO or RDO control. There is then a USB and a RS232 console port.

Eaton 5P 1500 R Li Ion 1U Rear Middle IO
Eaton 5P 1500 R Li Ion 1U Rear Middle IO

Next, we have the fan. We will see that fan again on the internal overview. The power cord is 5-15P cable on this unit for 120V systems. The cable itself is not large. We were slightly surprised this was only a ~6ft <2m cable. It seems like this unit is designed to plug into an upstream PDU.

Eaton 5P 1500 R Li Ion 1U Rear Network Card Slot
Eaton 5P 1500 R Li Ion 1U Rear Network Card Slot

Finally one will see a black card slot cover. This covers the network car slot. We asked Eaton to send a Network M2 card (not to be confused with the popular M.2 standard for SSDs, WiFi/ Bluetooth radios, LTE modems, AI accelerators and so forth.) This is a proprietary network card that adds network manageability to the system.

Eaton 5P 1500 R Li Ion 1U Network M2 Card Front
Eaton 5P 1500 R Li Ion 1U Network M2 Card Front

Here is the back of this card.

Eaton 5P 1500 R Li Ion 1U Network M2 Card Rear
Eaton 5P 1500 R Li Ion 1U Network M2 Card Rear

Here is the card being installed into the slot.

Eaton 5P 1500 R Li Ion 1U Card Insertion
Eaton 5P 1500 R Li Ion 1U Card Insertion

Finally, here is the card installed. While the total installation time took under a minute (save for photography time) we just want to make it clear that this is something that is absolutely a high-margin product for Eaton as it is a relatively simple device, and it is also quite costly to add. Still, we wanted to show management functionality.

Eaton 5P 1500 R Li Ion 1U Network M2 Card Installed
Eaton 5P 1500 R Li Ion 1U Network M2 Card Installed

Next, we are going to get inside the unit.

Design & Aesthetics
Feature Set
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Patrick has been running STH since 2009 and covers a wide variety of SME, SMB, and SOHO IT topics. Patrick is a consultant in the technology industry and has worked with numerous large hardware and storage vendors in the Silicon Valley. The goal of STH is simply to help users find some information about server, storage and networking, building blocks. If you have any helpful information please feel free to post on the forums.


  1. Thank you so much for this review. I’ve been eyeing this unit ever since it was released. UPS reviews/overviews have been really hard to comeby.

  2. A general comment on the M2 is that the software is trying to be too fancy with AJAX. Logging in somehow takes minutes, which isn’t good if you just got an alert and want to see what is going on. Also not very mobile friendly, which is the exact use case for responding to an alert email on the go.

    A common issue with both APC and Eaton is that alert emails lack easy to read summary of the alert conditions. Nice to know there is a temperature alert, too bad I have to login to know the actual temperature. Though Eaton can include a CSV history that you have to scroll down to the bottom to know the latest reading, very hard on a mobile device.

  3. Does anyone have any experience with Tripplite’s UPS and management interface? I’m curious if the interface is better/the same/worse than APC and Eaton.

  4. @Daryl Low makes very good points about the management software getting way too fancy.

    I fully agree; keep the management software simple and onboard in the unit. Then make that software easy to upgrade.

    UPS Vendors Take Note: Clean, simple, speedy interfaces are MUCH MORE USEFUL that bloated script-ridden dreck that screams the vendor logo and banners and glitzy menus everywhere while it buries the much needed info.

    The network card option should simply provide the hardware interface to interact with an Ethernet network. Agian, keep it simple. Better yet… keep it compatible across multiple product generations instead of making it product line or product generation specific that goes obsolete in the next product cycle. I know that’s no fun for the vendors, but the constant upgrade cycle due to incompatible parts across product generations is very costly for most of us. APC might be the worst at that with their custom battery configurations and connectors.

    There was no mention in the article if the unit has any management capability at all via the serial or USB ports. Could it interact with the Network UPS Tools software via a USB and-or serial connection (USB being preferred) to a separate monitoring PC?

    Some of us might have a very low end PC (old Intel Atom boards in my case) or Raspberry Pi (have used these too) being used as a network-enabled monitoring PC running Network UPS Tools software on Linux with USB connections to various UPS blocks that do not have network ports of their own.

    I dread the thought of having to source a replacement battery for one of these. I expect a replacement battery will cost almost as much as the original UPS did, assuming I can find the battery! I found it interesting that the article did not bother to dip it’s sensitive toe into this topic.

    Patrick: Can we please IMPROVE the quality of these reviews? More and more these product reviews are becoming lightweight stuff like you find on Cnet or ZDnet. Make them more detailed and cover product lifecycle topics. Or does that cut into the side hustle consulting gig?

  5. They are manageable via Serial/USB, but they’re fiddly (Never met a UPS that wasn’t). Urge anyone considering these to factor the cost of the M2 into the purchase decision and manage the UPS via that.

    Had a similar concept with the Pelican for use in WeWorks and Conventions, but found that it was too challenging shipping Lithium batteries around in North America. Removed them in favor of just using house power feeding into PDUs and adjusted the SLAs for such sites.

    They aren’t really designed for high-density applications (120v/15a, can get 6kVA in 3U with other products) or for long hold up times (Cannot stack EBMs). Where they really shine is branch offices that have a quarter rack of network equipment that need protection from brownouts or brief blackouts.

    One of the big selling points of Lithium not mentioned in this article is the long lifetime of the batteries. You’ll note this unit has a five year warranty vs three for the VLRA equivalent, and Eaton publishes that the Lithium batteries should last at least twice as long as VLRA lead batteries used in the same conditions. This is a big benefit for orgs with many far-flung small offices that don’t have IT Staff.

  6. How are these for home labs? Do they have any noise? How well do they perform vs double online units? Also does it have software to turn off ESXI etc?

  7. I was a little surprised at the remark about Li-ion batteries losing capacity over time, I could do with context that they could last measurably longer than SLA batteries.

    Nice use of a 1U transformer in there, I’ve never seen one that heafty before!

    I’m curious as to what the nominal voltage and Ah of the battery, I couldn’t make it out from the pictures. It would be interesting to see a LTO UPS because of their high endurance and inherent safety, which I am sure would make some people less nervous about putting them in a rack of expensive equipment.

  8. Interesting product. What else is in this product line?

    I wonder who is providing rack-scale 208v Lithium UPS? Say, 30a circuit / 6KW or thereabouts. Would probably need to be larger than 2u.

    What kind of costs are these products? MSRP would be good to know.

  9. Bob, quick search on LTO sounds like those would be good for grid storage applications due to high cycle life, and rapid charge / discharge.

    Not seeing a strong reason to use LTO in a UPS instead of LifePO4. Cycle counts are minimal in a UPS. Long charge times are not usually an issue. High discharge rate would be an advantage but tolerable to use LifePO4 here anyway. LifePO4 is considered one of the safer and more stable chemistries as well.

  10. “Instead of passing judgment on how these units are made…” – isn’t this one of the points of a review site to provide objective assessments on hardware?

  11. I really appreciate that you gave so much space to pointing out how absurd it is that network management is an expensive optional addon for a device in this class, because that is absolutely true and more vendors need to be called out aggressively and repeatedly on this BS.

    I just have one minor complaint, where you say “In the 2020s, this is starting to feel like it should be a part of the product rather than an add-in card.”

    I think that should have started in the 2010s. There has been no good excuse for making network management an optional feature on anything intended to go in to a rack for years now. It should be considered mandatory and all products that don’t include it by default should be shamed. Home class stuff, whatever, but if it’s marketed to a business network management should not be optional.

  12. I have a rather unusual question. Which SoC is behind the white label? It is located on the PCB directly behind the LCD display. You can see it on the picture ‘Eaton 5P 1500 R Li Ion 1U Internal Front Right 2’. If someone knows please let me know.


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