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expiredMeowssi | Staff posted 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
168 Comments
77.7K Views
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Deal Details
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
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

Community Voting

Deal Score
+47
Good Deal
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Top Comments

Azrael_the_Cat
5.2KComments
801Reputation
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.
Go to Comment
Ghatid
910Comments
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 5, 2024 11:53 AM
574 Comments
Joined Jan 2015
KapazzaMar 5, 2024 11:53 AM
574 Comments
Quote from bigjonnee :
I'm going to replace my electric car's 12 Volt battery. It will last a lot longer and I don't been a ton of amps to start EV. Hope I am not missing something!
I was thinking the same, but the dimensions don't match my cars battery (group B19).
1
Mar 5, 2024 12:25 PM
3K Comments
Joined Nov 2006
vnw98Mar 5, 2024 12:25 PM
3K Comments
Can these be used for a jet ski. In Florida so don't need freeze protection.
4
Mar 5, 2024 12:44 PM
1.5K Comments
Joined Oct 2006
hi4noonMar 5, 2024 12:44 PM
1.5K Comments
Quote from iamverycrazy :
I am planning to replace the battery for a Tesla. Will this work for Cybertruck?
This has to be a joke. That's like putting regular gasoline in a Ferrari if you have the money to buy the Tesla buy a good brand lithium battery
7
Mar 5, 2024 2:09 PM
2.7K Comments
Joined Jan 2007

This comment has been rated as unhelpful by Slickdeals users.

Mar 5, 2024 2:50 PM
445 Comments
Joined Aug 2011
cptskippyMar 5, 2024 2:50 PM
445 Comments
Quote from obijeewhyen :
Do you need a special charger to charge these with?
Quote from Ilovedeals :
Anyone use the 10Ah for their UPS? I read very mixed messages. Some say it works fine with BMS and others say it is a bad idea and lead acid is better for UPS. If it lasts more than twice as long as lead acid it might be worth it.
Quote from Caleo :
They have a BMS onboard so no, no special charger really needed as long as you stay within their specified input voltage limit (14.5V)
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.
4
Mar 5, 2024 3:21 PM
1.6K Comments
Joined Sep 2008
lpranalMar 5, 2024 3:21 PM
1.6K Comments
Quote from Ilovedeals :
Anyone use the 10Ah for their UPS? I read very mixed messages. Some say it works fine with BMS and others say it is a bad idea and lead acid is better for UPS. If it lasts more than twice as long as lead acid it might be worth it.
Some people have had luck with them, but I tried two of this specific brand (eco-worthy) and they seemed to work just fine (including removing power for a test), but neither would hold a charge for more than a day or two while plugged in.
Mar 5, 2024 3:23 PM
910 Comments
Joined Aug 2008
GhatidMar 5, 2024 3:23 PM
910 Comments
Quote from gobblygook :
I didn't say "blah blah blah kills the deal". I was pointing out two features that it doesn't have that people may or may not expect to be in a battery.

I originally ordered one for a trolling motor battery but cancelled the order once I realized these two functions, especially Bluetooth monitoring because I want to know how much energy I have left so I don't leave myself stranded. Different people have different uses.
Sure sounds like you're saying "blah blah blah kills the deal"...
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Mar 5, 2024 3:51 PM
1.6K Comments
Joined Sep 2008
lpranalMar 5, 2024 3:51 PM
1.6K Comments
Quote from cpbong :
I have two 12v 10ah in series in both an APC smart UPS 1000 and a cyber power 1350va, both work fine. Both are powering loads less than 240w. I didn't do anything special, just dropped them in. Runs my cable model, router and NAS (about 45w) for about 4 hours. Capacity is less than rated since the SLA charger does not charge lifepo4 to their max capacity, but that is fine with me as long as they last twice as long as the SLA batteries I used to use
How long have you been running those for? I had similar experience initially, but after a while they would slowly die.
Mar 5, 2024 3:56 PM
1.5K Comments
Joined Sep 2015
solomaMar 5, 2024 3:56 PM
1.5K Comments
Quote from Ilovedeals :
Anyone use the 10Ah for their UPS? I read very mixed messages. Some say it works fine with BMS and others say it is a bad idea and lead acid is better for UPS. If it lasts more than twice as long as lead acid it might be worth it.
10Ah has 10A BMS. So 10Ax12V=120W. So if you keep UPS load under 120W it will work. Above 120W and BMS will disconnect battery from UPS in few seconds or minutes.
Mar 5, 2024 4:00 PM
1.5K Comments
Joined Sep 2015
solomaMar 5, 2024 4:00 PM
1.5K Comments
Quote from Caleo :
They have a BMS onboard so no, no special charger really needed as long as you stay within their specified input voltage limit (14.5V)
Yes, you need special charger with Constant Current (CC) option so that it would charge with appropriate current.
Mar 5, 2024 4:03 PM
1.5K Comments
Joined Sep 2015
solomaMar 5, 2024 4:03 PM
1.5K Comments
Quote from bigjonnee :
I'm going to replace my electric car's 12 Volt battery. It will last a lot longer and I don't been a ton of amps to start EV. Hope I am not missing something!
Yes you are. You are missing battery charging circuits of your car. Best case you would blow battery protection fuse.
3
Mar 5, 2024 4:05 PM
2.7K Comments
Joined Jan 2007
gobblygookMar 5, 2024 4:05 PM
2.7K Comments
Quote from Ghatid :
Sure sounds like you're saying "blah blah blah kills the deal"...
No, those are just things to consider. Some people may not care, while others may. If you don't want those features, then yes, this is a very decent deal. I'm not arguing that at all.

I bought my first lifepo4 less than a week ago, and like I said, I'd ordered this exact battery but cancelled after realizing it didn't have Bluetooth monitoring. Yes, I paid more to have that feature, because it was an important feature to ME. Others who have watched videos to learn about LifePO4 batteries might assume that this is a "standard" feature.

I don't expect a company to advertise "doesn't do x,y,z", but I just wanted to help others make informed choices. I should have added more context in my original reply, but was in a hurry, so I just pointed out that this battery doesn't have those features.
1
Mar 5, 2024 4:17 PM
994 Comments
Joined Jan 2007
sjaxkingpinMar 5, 2024 4:17 PM
994 Comments
Quote from gobblygook :
No low-temp protection, no Bluetooth monitoring.
LOL, not asking for much in your $159 100ah LIFEPO4 are you?

Those "are" both features, but if you know of somewhere to get those features anywhere near these prices, by all means share with the class, I'll buy several.

If you are comfortable buying LIFEPO4 from EBay, these are some exceptional prices.
1
Mar 5, 2024 4:18 PM
1.5K Comments
Joined Sep 2015
solomaMar 5, 2024 4:18 PM
1.5K Comments
Quote from cpbong :
I have two 12v 10ah in series in both an APC smart UPS 1000 and a cyber power 1350va, both work fine. Both are powering loads less than 240w. I didn't do anything special, just dropped them in. Runs my cable model, router and NAS (about 45w) for about 4 hours. Capacity is less than rated since the SLA charger does not charge lifepo4 to their max capacity, but that is fine with me as long as they last twice as long as the SLA batteries I used to use
Actually, statement about changing to a max capacity is not true. Lifepo battery will charge as long as applied voltage is above rest voltage, it will take much much longer to fully charge it. Usually basic UPS charge with 13.8V which is above rest voltage for battery. You will get full charge.
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Mar 5, 2024 4:23 PM
994 Comments
Joined Jan 2007
sjaxkingpinMar 5, 2024 4:23 PM
994 Comments
Quote from bigjonnee :
I'm going to replace my electric car's 12 Volt battery. It will last a lot longer and I don't been a ton of amps to start EV. Hope I am not missing something!
Depending on your climate, you may find the life of these 12v batteries severely lessened from charging it while below freezing. Your EV heats it's big battery up while charging, but that won't help this guy
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