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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.

Examples (prices after code SPRINGSAVE20):

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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
805Reputation
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.
Go to Comment
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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Mar 6, 2024 5:18 PM
730 Comments
Joined Sep 2012
MaverickKWSMar 6, 2024 5:18 PM
730 Comments
Here is a slightly better deal on what appears to be the same 50AH batteries: https://www.ebay.com/itm/14550785...681b1dd49c
Mar 6, 2024 5:20 PM
730 Comments
Joined Sep 2012
MaverickKWSMar 6, 2024 5:20 PM
730 Comments
Quote from Xray_Man View quoted comment :
Would these batteries work for my riding lawnmower?
Most require a 20-30AH battery, but I'm not sure that the wattage with these (in that amperage range) is sufficient for cranking.
Mar 6, 2024 5:23 PM
31 Comments
Joined Oct 2023
WeeeHeeATeePeeMar 6, 2024 5:23 PM
31 Comments
Almost pulled the trigger but found this awesome system that will fit my needs better: https://slickdeals.net/f/17336784-bluetti-ps72-700w-716wh-refurbished-portable-solar-power-station-239-99

Quite a steal with no work besides hooking up solar on my van's roof!
Mar 6, 2024 5:25 PM
170 Comments
Joined Aug 2014
mike96sc2Mar 6, 2024 5:25 PM
170 Comments
Quote from Surferdudemi View quoted comment :
Link? Looks like $270 for the 12v 100AH on Amazon right now. Cheapest other brand is $160 or more with free shipping (Prime).
My apologies. They were $190 https://a.co/d/3c47VuL
Mar 6, 2024 6:23 PM
559 Comments
Joined Nov 2017
drzkMar 6, 2024 6:23 PM
559 Comments
Quote from Surferdudemi View quoted comment :
I've had a pair of 7AH LiFePO4 batteries in an APC UPS for a few months. Just pulled them out to check because of what I've read here. One is at 13.4V and the other is at 13.8V, so both are essentially fully charged for batteries where the flat part of the curve is around 3.2V. Balancing is obviously a potential issue when they are in series. I just put the low one on a bench supply to charge and then will put the set back into the UPS. It has worked fine in the few outages we've had so far. Most have been blips or very short outages.
They will work and charge. Just not charge fully. In low cost, low demand applications like this, with prices getting so cheap on LiFe, it's a no brainer to switch over when lead acids poop out.

Balancing is an issue in parallel, if that's what you meant. But proper wiring eliminates that. Series presents no balancing issue.
1
Mar 6, 2024 7:42 PM
756 Comments
Joined Jan 2009
Boost_addictMar 6, 2024 7:42 PM
756 Comments
Anyone know if the "battery tender" brand charger sold at Costco etc with LiFePO mode will charge this battery OK or should a fancier programmable charger be used? Isnt the BMS built into the battery supposed to make sure it's not over or under charged?
Pro
Mar 6, 2024 8:03 PM
1.6K Comments
Joined Sep 2015
soloma
Pro
Mar 6, 2024 8:03 PM
1.6K Comments
Quote from Surferdudemi View quoted comment :
thank you for sharing real life experience!
Quote from drzk View quoted comment :
They will work and charge. Just not charge fully.
Hi drzk, are you EE phd too? Why it would not fully charge under 13.8V in UPS (which is 3.45V per cell)?
There are literally hundreds posts and videos on web and youtube with people sharing real life experience charging Lifepo4 with 3.4V per cell.
This is some random link from goggle search
https://diysolarforum.com/threads...-45.27400/
4

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Mar 6, 2024 8:39 PM
441 Comments
Joined Feb 2019
late_apexMar 6, 2024 8:39 PM
441 Comments
Quote from Boost_addict View quoted comment :
Anyone know if the "battery tender" brand charger sold at Costco etc with LiFePO mode will charge this battery OK or should a fancier programmable charger be used? Isnt the BMS built into the battery supposed to make sure it's not over or under charged?
Chargers for LiFePO4 batteries are actually simpler than those made for SLA. If it says it specifically compatible with LiFePO4, you're fine. The only detail is that some chargers can be set to stop at 80 or 90% of full charge, and that greatly extends the life of a lithium battery. But even going to 100% when charging, you'll still get thousands (IIRC) of cycles out of the battery which is much better than any SLA.
Mar 6, 2024 8:42 PM
419 Comments
Joined Aug 2017
SparkiekunMar 6, 2024 8:42 PM
419 Comments
Quote from desidude2000 View quoted comment :
What is everyone using these for?
I bought something similar (12v 10ah) for my kids power wheels type car. Wondering if I really need a 12v to 6v converter when I see all these YouTube videos of people putting their dewalt 20v max (or Milwaukee equivalent) to use as batteries instead
Mar 6, 2024 9:17 PM
614 Comments
Joined Aug 2015
SinbiosMar 6, 2024 9:17 PM
614 Comments
Quote from Surferdudemi View quoted comment :
I've had a pair of 7AH LiFePO4 batteries in an APC UPS for a few months. Just pulled them out to check because of what I've read here. One is at 13.4V and the other is at 13.8V, so both are essentially fully charged for batteries where the flat part of the curve is around 3.2V. Balancing is obviously a potential issue when they are in series. I just put the low one on a bench supply to charge and then will put the set back into the UPS. It has worked fine in the few outages we've had so far. Most have been blips or very short outages.
Mind linking the 7Ah batteries you're using? What's their maximum power draw?
Mar 6, 2024 9:47 PM
213 Comments
Joined Jul 2015
jadr313Mar 6, 2024 9:47 PM
213 Comments
Tempting. The 100 Ah would go well for a small camper and the 10 Ah would be fine for a ride-on toy.
Mar 6, 2024 11:29 PM
20 Comments
Joined Nov 2005
jb007Mar 6, 2024 11:29 PM
20 Comments
Quote from oldsouthbw View quoted comment :
Anyone use these for boat trolling motor yet? If so, what are your thoughts?
I bought this brand for that purpose. DOA. Case was all scratched up. Seller was terrible. I eventually got refunded but had to deal with disposal.

I ended up buying a talentcell brand 24ah. It is amazing. Lightweight and powers my small minnkota like a champ.
1
Mar 7, 2024 3:02 AM
464 Comments
Joined Apr 2007
porshuhMar 7, 2024 3:02 AM
464 Comments
Quote from drzk View quoted comment :
They will work and charge. Just not charge fully. In low cost, low demand applications like this, with prices getting so cheap on LiFe, it's a no brainer to switch over when lead acids poop out.

Balancing is an issue in parallel, if that's what you meant. But proper wiring eliminates that. Series presents no balancing issue.
You got it backwards
Mar 7, 2024 2:00 PM
445 Comments
Joined Apr 2015
SurferdudemiMar 7, 2024 2:00 PM
445 Comments
Quote from drzk View quoted comment :
They will work and charge. Just not charge fully. In low cost, low demand applications like this, with prices getting so cheap on LiFe, it's a no brainer to switch over when lead acids poop out.

Balancing is an issue in parallel, if that's what you meant. But proper wiring eliminates that. Series presents no balancing issue.
You've got parallel and series mixed up. Series is two 12v batteries with the + of one connected to the - of the other, to provide 24vdc. Because the same current goes through both batteries, the voltage of the batteries can vary depending on the capacity and condition (e.g., charge efficiency) of each. When they are connected in parallel, they both MUST be at the same voltage because the + and - terminals of one are connected to the + and - terminals of the other, repectively. This provides 12vdc. "Out of balance" means that they are at different voltages, and likely different states of charge.

Perhaps you are thinking of "top balancing" where you charge batteries in parallel to the same voltage and the connect them in series? In that coinfiguration you typically have a BMS with balancing circuits to maintain close to the same voltage on each battery or cell as they are charged in series.

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Mar 7, 2024 2:07 PM
445 Comments
Joined Apr 2015
SurferdudemiMar 7, 2024 2:07 PM
445 Comments
Quote from Sinbios View quoted comment :
Mind linking the 7Ah batteries you're using? What's their maximum power draw?
I'm using two different batteries because I got them for evaluation and could only get one from each mfr. (I'm not recommending any particular mfr.) One of them is this one:
https://www.amazon.com/dp/B0CHV5KTKG

However, it appears that these Eco-Worthy 10AH batteries in this deal are better in terms of energy per $ at current prices. The 7 AH batteries were $10 off iirc a few months ago

Any of the LiFePO4 batteries will work. Getting the same capacity batteries is important, and from the same mfr is better (because they are likely to be better matched).

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