expiredMeowssi | Staff posted Mar 04, 2024 06:06 PM
Item 1 of 4
Item 1 of 4
expiredMeowssi | Staff posted Mar 04, 2024 06:06 PM
Eco-Worthy LiFePO4 Batteries: 12V 50Ah Battery $96, 12V 30Ah Battery
& More + Free S/H$64
$85
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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
https://www.batteriespl
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.
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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A 10AH 1C battery shouldn't be charged or discharged at more than 10A. A 2C 10AH battery could be charged/discharged at 20A, 3C would be 30, etc. By comparison, a 10C 10AH battery could be charged/discharged at 100A.
Compared to SLA batteries, they have much higher energy density (particularly by mass), they have more cycles and a better discharge curve (but they benefit from specialized charging). They can't deliver the high C of a Li-Ion battery or a SLA, but they are far safer than Li-Ion and less sensitive to poor charging circuits.
Multiple suggested using these in cars, but the ad specifically says not to use the batteries to start cars, probably because of the low C and the very high current draw of a starter.
I really want the 280AH battery but in a 24V package. Looks like I can only get that via 2 qty 12V 280A batteries. Really don't want to have to balance 12V batteries configured in a 24V string.
There was also a weird recall email send out by eBay.
This youtube review [youtube.com] shows the BMS in the 10A battery does not do much,
It currently supports my gaming desktop (5800X3D + RX 6900 XT). The batteries haven't arrived yet, but I'm excited to see how they perform.
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.
Please make sure you know what.you are talking about. No SLA charger floats at only 12.46 volts....
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You can charge lifepo4 with 13.6V (3.4V per cell). 14.4 will provide fast charge. 13.6V is a slow charge
For sla you need higher voltage to start process, for lifepo4 you need higher voltage to speedup process
It would be unusual to find a charger above 13.8 volts as you start generating gas (which is bad)
There was also a weird recall email send out by eBay.
This youtube review [youtube.com] shows the BMS in the 10A battery does not do much,
But I just don't need it right now. Having ~$180 after tax on hand is better than saving $40 for down the road.
Plus it's got a max continuous discharge rate of 1200w. Would have to get their Max battery for near $320 for a definite 1800w.
You can definitely stack two of these batteries for a 24v system that can put out 2400w, but then you're juggling balancing them. Not super difficult, but then I'm still $300+ down for a project I might not get to for a year!
It's that slickdeals effect
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Kids ride-on toys typically use SLA style batteries, vs ebikes which use Lithium Ion batteries.
Where in that spectrum do these LiFePO4 batteries fall? Can you upgrade a kids ride-on car with one of these as long as you match voltage? Similar question for using these on a full fledged e-bike. I have dabbled with both building ebikes as well as modding my kids ride-on toys. But I cannot for the life of me figure out if these LiFePO4 style batteries are similar to either technology.
Alternatively, could these be used to replace the 12v battery in my RV?
I had been doing research on tool batteries with a BMS and contemplating going down that road with a voltage converter. So happy I didn't do it. The 10ah was a direct swap with respect to the size and terminal locations. Granted, I wasn't aiming to get more power out of the motors.
Only caveat is that the supplied charger will not work. I had a Noco Genius charger lying around from a slick deal a few years back that gladly handled the constant current requirements of lifepo4 chemistries.
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