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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 7, 2024 6:26 PM
2.1K Comments
Joined Mar 2006
TRUMP_XDMar 7, 2024 6:26 PM
2.1K Comments
Quote from Sparkiekun View quoted comment :
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
U don't. 12v isn't that fast on a powerwheelā€¦ if it was designed for 6v, just make sure u add some weight in case it is too light ā€¦. Putting 20v on a light body made for 6v would probably make it pop wheelies with a toddler riding, and not too safe unless u do other modsā€¦ but guessing 12v would be a fun upgrade for most smallest sized 6v power wheels
1
Mar 7, 2024 6:35 PM
2.1K Comments
Joined Mar 2006
TRUMP_XDMar 7, 2024 6:35 PM
2.1K Comments
Quote from Surferdudemi View quoted comment :
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.
Will the 50A continuous BMS double to 100A continuous if i wire 2x48v in parallel for a ***stock*** Yamaha golf cart?

Anybody have experience with this setup that can share wisdom , much appreciated.
Mar 7, 2024 10:43 PM
33 Comments
Joined Dec 2009
harom1971Mar 7, 2024 10:43 PM
33 Comments
Can a combination of these be used as a low voltage battery for Tesla?
1
Mar 8, 2024 3:09 AM
28 Comments
Joined Mar 2019
plizzoMar 8, 2024 3:09 AM
28 Comments
Quote from desidude2000 View quoted comment :
What is everyone using these for?
I've got the 10ah in my kayak to power the fish finder. No issues after about 3 months of regular use.
Mar 8, 2024 1:22 PM
445 Comments
Joined Apr 2015
SurferdudemiMar 8, 2024 1:22 PM
445 Comments
Quote from TRUMP_XD View quoted comment :
Will the 50A continuous BMS double to 100A continuous if i wire 2x48v in parallel for a ***stock*** Yamaha golf cart?

Anybody have experience with this setup that can share wisdom , much appreciated.
That's a very good question. I have no experience with that, but my guess is that you could get an imbalance where one pack is delivering more current than the other. In that case, if you are drawing 90-100A, one pack would exceed the 50A limit. But BMSs usually have a surge limit that allow you to exceed the regular limit for a short period of time. How that is programmed varies between BMS and battery mfrs, so experience with one brand / model doesn't necessarily apply to others. In the case of a golf cart, that would happen when you're accelerating, so if you're not stomping on it for more than a short period of time, it could work.
Mar 8, 2024 4:56 PM
5.2K Comments
Joined Feb 2006
Azrael_the_CatMar 8, 2024 4:56 PM
5.2K Comments
Quote from TRUMP_XD View quoted comment :
Will the 50A continuous BMS double to 100A continuous if i wire 2x48v in parallel for a ***stock*** Yamaha golf cart?

Anybody have experience with this setup that can share wisdom , much appreciated.
Yes, someone else mentioned concern about sharing between the batteries. This will work fine as you are suggesting. They will share well because the internal impedance of the battery causes a negative feedback loop (if you think about controls theory (meaning as the current goes up the voltage drops slightly causing the other battery to take on more load, this goes back and forth and they will share in a stable way)). Obviously if the internal impedances are way off they won't share quite right but it's unlikely you'd ever get more than a few percent mismatch if you use the same batteries of the same age.
Mar 8, 2024 8:04 PM
2.1K Comments
Joined Mar 2006
TRUMP_XDMar 8, 2024 8:04 PM
2.1K Comments
Quote from Surferdudemi View quoted comment :
That's a very good question. I have no experience with that, but my guess is that you could get an imbalance where one pack is delivering more current than the other. In that case, if you are drawing 90-100A, one pack would exceed the 50A limit. But BMSs usually have a surge limit that allow you to exceed the regular limit for a short period of time. How that is programmed varies between BMS and battery mfrs, so experience with one brand / model doesn't necessarily apply to others. In the case of a golf cart, that would happen when you're accelerating, so if you're not stomping on it for more than a short period of time, it could work.
Thanks. It's the hills where the voltage increases dramatically. Flat ground running is fine for theseā€¦ just debating on whether I can use these for future upgrades to my motor and controller or if I would need to pull the BMS and replace it if it is not additive

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Mar 9, 2024 1:31 PM
409 Comments
Joined Dec 2011
robasha4Mar 9, 2024 1:31 PM
409 Comments
Quote from Tourist1292 View quoted comment :
I almost bought the 100Ah one a few days ago when there was the 20% off Slickdeals coupon which was expired after I checked out other brands with better reviews. Now I am tempted to order this one.
Thanks, your statement really helped move this thread along.
1
3
Mar 9, 2024 1:38 PM
12.4K Comments
Joined May 2007
superslickzMar 9, 2024 1:38 PM
12.4K Comments
Quote from Tweak42 View quoted comment :
I've been using a Weize 10ah lifepo4 in an APC UPC for year and a half with no issues. I don't have more than 100w load on and the longest I've run it loaded was about 10 minutes so I don't know how long it will go before shutdown. The battery is rated at 10a continuous 20a peak, so 120watt load should be in theory what it can handle. I got tired of replacing the lead acid battery every 2 years, so if it makes it past that it will have paid for itself.

I also have a dual 10ah battery APC model that I'm considering trying a pair of these eco-worthy but I'm not sure how well these will work in series, ie. if there are any charge balancing issues.
Can you give me a link to what you are talking about? The Weize fits inside your APC?
Mar 9, 2024 1:52 PM
46 Comments
Joined Mar 2013
Tazdeviloo7Mar 9, 2024 1:52 PM
46 Comments
Could this work as a car battery in an EV?
1
Mar 9, 2024 4:14 PM
244 Comments
Joined Jan 2022
AquaKite9796Mar 9, 2024 4:14 PM
244 Comments
I use the 30Ah version on my kayak to power my Garmin 93sv full brightness after 8 hours battery was at 70%. Not bad.
Mar 10, 2024 4:36 AM
59 Comments
Joined Oct 2012
tinku_grgMar 10, 2024 4:36 AM
59 Comments
Can we replace the regular car 12V batteries with these?
1
Mar 10, 2024 5:53 AM
1.3K Comments
Joined Dec 2008
Tweak42Mar 10, 2024 5:53 AM
1.3K Comments
Quote from superslickz View quoted comment :
Can you give me a link to what you are talking about? The Weize fits inside your APC?
https://www.amazon.com/gp/product/B08ZH77QCG/
Amazon hasn't had it in stock for awhile. Not sure if Weize will ever carry it again since they seem more targeting car sized 100ah lifepo4 batteries.

I bought it on recommendation of this youtube video
https://www.youtube.com/watch?v=sge3IKWF4qo

Yes, it fits in my APC. I think the APC manufacture part is RBC2.
Mar 10, 2024 5:57 AM
2.2K Comments
Joined Oct 2018
Le-SerKaleMar 10, 2024 5:57 AM
2.2K Comments
Quote from Tweak42 View quoted comment :
https://www.amazon.com/gp/product/B08ZH77QCG/
Amazon hasn't had it in stock for awhile. Not sure if Weize will ever carry it again since they seem more targeting car sized 100ah lifepo4 batteries.

I bought it on recommendation of this youtube video
https://www.youtube.com/watch?v=sge3IKWF4qo

Yes, it fits in my APC. I think the APC manufacture part is RBC2.
that video, wow. now I want it..

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Mar 10, 2024 6:01 AM
1.3K Comments
Joined Dec 2008
Tweak42Mar 10, 2024 6:01 AM
1.3K Comments
Quote from tinku_grg View quoted comment :
Can we replace the regular car 12V batteries with these?
Not if you want to start a gas engine. Old lead acid batteries are still best for pure cranking amps. However these lifepo4 batteries are great for medium to low draw 12v accessories.

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