[NANOG] Re: Small Capacity UPS

[Mark Tinka via NANOG <nanog () lists nanog org>]

On 4/9/25 11:21, Gary Sparkes wrote:

> So, they're all selling LFP units.
>
> LFP is a type of lithium-ion battery. I could (and do) call a LiFePo4 cell a lithium-ion battery and be 100% correct - because it is. 
> LiPo's, NMC/PO4 (be it in 18650 or other formfactor, etc), LFP, you name it, they're all lithium-ion batteries because 
> that's the mechanism they operate by. They're just different chemistries and formfactors of lithium-ion batteries.
>
> https://www.eaton.com/us/en-us/products/backup-power-ups-surge-it-power-distribution/backup-power-ups/lithium-ion-batteries-/eaton-9-series-lithium-ion-batteries.html
>
> This liebert information sheet (second link of products after eaton in my list) - 
> https://www.vertiv.com/491005/globalassets/products/critical-power/uninterruptible-power-supplies-ups/vertiv-liebert-ita2-ups-3-phase-208v/vertiv-liebert-ita2-three-phase-ups-vrla-li-ion-br-en-na-sl-26270-web.pdf
>  - from this information sheet - "Safe and Reliable: Both VRLA and Li-ion ensure safety and reliability. Lithium-Ion 
> (LiFePO4) battery chemistry is safest and integrated battery management system (BMS) also ensures safe and reliable 
> operation."
>
> The few APC MSDS (Materials Safety Data Sheet) sheets I glanced at indicate Lithium Iron Phosphate as the cell ingredient as well 
> - which means LFP chemistry. So they're shipping LiFePo4 cells as well. Weird they didn't make it (easier) to find 
> that, though. https://www.apc.com/us/en/faqs/FA158828/ - I looked at XBP48RM2U-LI_NAM_EN_SDSV1.0.pdf and 
> SMTL750_1000_1500_LI_EU_EN_SDS_V2.0 (1).pdf
>
> That second sheet shows that 
> https://www.apc.com/us/en/product/SMTL750RM2UC/apc-smartups-line-interactive-750va-lithiumion-rack-tower-2u-120v-6x-nema-515r-outlets-smartconnect-port+smartslot-short-depth-avr-lcd/?range=61915-smartups&parent-subcategory-id=88976&selectedNodeId=23679172486
>  is a LFP based UPS system.
>
> Though not all models - you can see from APCRBC173-LI_NAM_EN_SDS_V1.3.pdf that specific pack is NMC. So you'd just have 
> to investigate each model to see what it is.
>
> So yes, all four are selling LFP units, though APC seems to be a bit harder to pick out which is which, not that it 
> really matters much anymore from a safety perspective, but if it concerns you, the information IS available.
>
> I'd feel perfectly comfortable with any of them technology wise these days (and in the past, too) though.

Most Li-Ion batteries sold for stationery applications will be LFP, just 
because they are cheaper and more thermally stable.

NMC is not far off, but it doesn't make sense for stationery 
applications. You'd just be wasting energy for no gain.

Mark.
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