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Meowssi | Staff 78K Views
Mar 4, 2024 6:06 PM

Eco-Worthy LiFePO4 Batteries: 12V 50Ah Battery $96, 12V 30Ah Battery

$64

$85

24% off
& More + Free S/Hat eBay
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Update: This popular deal is still available.

Eco-Worthy-US via eBay has select Eco-Worthy LiFePO4 Lithium Iron Phosphate Multi-Purpose Batteries on sale for the prices listed below when you apply Extra 20% Off coupon code SPRINGSAVE20 at checkout. Shipping is free.

Thanks to Deal Hunter Meowssi for finding this deal.

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Editor's Notes

Written by powerfuldoppler | Staff
  • About this deal:
    • Coupon offer valid through March 17, 2024 at 11:59PM Pacific Time while supplies last.
  • About this store:
    • eBay Seller Info:
      • eco-worthy-us (8,948 feedback rating)
      • 98.2% Positive feedback
    • Return Policy:
      • 30 day returns (Buyer pays for return shipping).
  • Please see original post for additional details & give the WIKI and additional forum comments a read for helpful discussion.

Original Post

Written by Meowssi | Staff
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Update: This popular deal is still available.

Eco-Worthy-US via eBay has select Eco-Worthy LiFePO4 Lithium Iron Phosphate Multi-Purpose Batteries on sale for the prices listed below when you apply Extra 20% Off coupon code SPRINGSAVE20 at checkout. Shipping is free.

Thanks to Deal Hunter Meowssi for finding this deal.

Examples (prices after code SPRINGSAVE20):

No Longer Available:

Editor's Notes

Written by powerfuldoppler | Staff
  • About this deal:
    • Coupon offer valid through March 17, 2024 at 11:59PM Pacific Time while supplies last.
  • About this store:
    • eBay Seller Info:
      • eco-worthy-us (8,948 feedback rating)
      • 98.2% Positive feedback
    • Return Policy:
      • 30 day returns (Buyer pays for return shipping).
  • Please see original post for additional details & give the WIKI and additional forum comments a read for helpful discussion.

Original Post

Written by Meowssi | Staff

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Top Comments

Azrael_the_Cat
5.2KComments
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Look, I appreciate you engaging but I've been designing battery charges for a long time.

you are misunderstanding the old school ways of setting charge modes and profiles for lead acid batteries. the charge mode and float mode are legacy methods associated with iron core transformers and liner voltage regulators when you needed to physically switch between current levels and voltage levels.

modern chargers current charge up to a taper voltage level then switch to constance voltage mode which is typically 13.5-13.8v. anyway I am sure your understanding is lost in semantic nuances. it's not your fault but I want to help people in the thread understand how it works enough to have the right perceptions.

I won't get into the chemistry but when you put an SLA cell above about 14 ish volts you start to dissociate hydrogen in the electrolyte. That is gas. You may have noticed flooded batts are vented and SLA batteries have pressure release valves built in for this reason to prevent bad things Smilie. see this great article here
https://www.batteriesplus.com/blo...ry-venting


Don't tell me to stop. I'm just correcting you erroneous statements I'm not trying to pick on you. I think you are just extrapolating wrong statements from some simple misunderstandings of the electronics and battery systems

Trust an EE PhD as hard as that might be.

have a great day. and happy to direct you to good articles if interested.
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Ghatid
915Comments
279Reputation
They're bare bones batteries (with BMS). Point me to a blue tooth monitoring + low/high temp protection battery at these prices. 100Ah 12v for $160.
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cptskippy
445Comments
102Reputation
SLA and LiFePO battery chemistries have different charging voltages. An SLA battery has a range from ~11.59-12.46v corresponding to 0% and 100% state of charge. A LiFePO battery's range however is ~10-14.6v.

The charger in a UPS is designed for SLA will cut off charging when the battery reaches 12.46v and shut off the UPS when the battery drops close to 11.59v. That means the LiFePO will never be full charged or discharged. So in that sense it's safe to use in a UPS.

However because it will keep the battery to SLA specs, you'll only be using approximately 23% of the battery's capacity. So that 10ah LiFePO will behave more like a 2.25ah SLA battery in the UPS.
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168 Comments

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Aug 5, 2024 3:25 AM
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Joined Feb 2006
Azrael_the_CatAug 5, 2024 3:25 AM
5.2K Comments
Quote from dealsalways View quoted comment :
Thanks for your replies. read through, and extremely useful.

to clarify, do you think connecting an UPS leads (removing existing SLA batery) to a LiFePo4 battery like this would basically work? Let's say 100AH rated capacity. Effectively this would function as an UPS with say 80% of the rated capacity ?

The 100Ah one should be $159 again on 8/3 so would like to buy it for UPS use.

https://www.ebay.com/itm/125038901445
Thx.
Well, it's not quite as black and white as will work or not. If the UPS you are using simply float charges the battery without any other weird monitoring or alarms or triggers then yes it will probably work.

The biggest thing is that you want to be careful of the power output as SLA batteries are really good at high power draw. LiFe batts are not. Now, given the 100Ah is a pretty big battery it has a decent discharge current rating of 50A, so at 12V ish you can deliver 600W to the UPS which may or may not be enough for your application (i.e. it wouldn't cover a gaming PC with a 800-1000W power supply running at full tilt with a RTX 4070-4090 for instance), but it would do fine for most other applications or the PC during non-gaming non-intense operation.

I hope that helps! Good luck!
Aug 5, 2024 6:34 AM
2.4K Comments
Joined Sep 2008
dealsalwaysAug 5, 2024 6:34 AM
2.4K Comments
Quote from Azrael_the_Cat View quoted comment :
Well, it's not quite as black and white as will work or not. If the UPS you are using simply float charges the battery without any other weird monitoring or alarms or triggers then yes it will probably work.

The biggest thing is that you want to be careful of the power output as SLA batteries are really good at high power draw. LiFe batts are not. Now, given the 100Ah is a pretty big battery it has a decent discharge current rating of 50A, so at 12V ish you can deliver 600W to the UPS which may or may not be enough for your application (i.e. it wouldn't cover a gaming PC with a 800-1000W power supply running at full tilt with a RTX 4070-4090 for instance), but it would do fine for most other applications or the PC during non-gaming non-intense operation.

I hope that helps! Good luck!
Thx.
Use is pretty simple and low-load.. Just for all the networking gear and a mini PC, under 80W total. Just want to consolidate all switches/APs etc on POE and load one big battey backup.

All the UPSes I have are simple ones from Slickdeals, 12V UPSes, from APC or CyberPower :

https://www.apc.com/us/en/product...placeable/

https://www.apc.com/us/en/product...et-retail/

https://www.cyberpowersystems.com/product/ups/intelligent-lcd/cp1000avrlcd/

https://www.cyberpowersystems.com/product/ups/standby/cp425slg/ [cyberpowersystems.com]

Any of these work fine hopefully?
Last edited by dealsalways August 5, 2024 at 12:33 AM.
Aug 6, 2024 1:39 AM
5.2K Comments
Joined Feb 2006
Azrael_the_CatAug 6, 2024 1:39 AM
5.2K Comments
Quote from dealsalways View quoted comment :
Thx.
Use is pretty simple and low-load.. Just for all the networking gear and a mini PC, under 80W total. Just want to consolidate all switches/APs etc on POE and load one big battey backup.

All the UPSes I have are simple ones from Slickdeals, 12V UPSes, from APC or CyberPower :

https://www.apc.com/us/en/product...placeable/ [apc.com]

https://www.apc.com/us/en/product...et-retail/ [apc.com]

https://www.cyberpowersystems.com/product/ups/intelligent-lcd/cp1000avrlcd/

https://www.cyberpowersystems.com/product/ups/standby/cp425slg/ [cyberpowersystems.com]

Any of these work fine hopefully?
Unfortunately looking at the marketing material for the UPS won't help us determine if it "will work fine". It's really a matter of how they designed the charge circuitry. Again it's PROBABLY fine.

Let me give some examples that might be issues. Some times the float voltage for the UPS is designed for a small trickle load persistently (like 10mA), but with a LiFe battery this might drive the voltage up to the cutout voltage opening the LiFe protection circuit. This in and of itself wouldn't be an issue unless the UPS sees this as an error of some kind (I've not had a problem with it yet).

I'd give it a shot. Like I said it is probably will be fine. If you can't return the ebay battery maybe try buying a small one off amazon and just give it a couple charge and discharge cycles in the UPS. After that you should be pretty confident for the more expensive 100AH.

Just my thoughts.

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