AliExpress has
ECO-WORTHY 12V 150AH Bluetooth LiFePO4 Lithium Battery (1100700145) on sale for $161.99 - $32 (apply coupon code RDT32C at checkout) =
$129.99.
Shipping is free.
- Note: Price may fluctuate slightly with currency exchange rates. You must be signed into your AliExpress account and have your address added to add items to your cart and place an order. You may have to manually type in the promo code to apply it at checkout. This item ships from a USA warehouse.
Thanks to community member
gabe23111 for finding this deal.
Features:- Meet new ECO-WORTHY 12V 150Ah LiFePO4 battery featuring Bluetooth 5.0. Now you can check the status of battery voltage, current and capacity at any time from your phone.
- ECO-WORTHY 12V 150Ah LiFePO4 Battery measures L13*W6.8*H8.7 inches and only weighs 34.61 lbs.
- Equipped with low-temperature cut-off protection which automatically cuts off the battery from charging when the cell temperature is below -7℃ (19.4℉) to prevent the battery cells from being damaged. Especially designed to ensure safe use for the low temperature charging environment in winter.
- Manufactured with automotive grade lithium iron phosphate cells, which offers higher energy density, more stable performance and greater power. The cells inside the battery are UL,IEC tested and CE,RoHS certified, providing the highest level of safety for you. It also has a built-in 120A BMS to protect the battery from overcharge, over temperature, over discharge, over current, low temperature and short circuit.
- ECO-WORTHY 150AH Lithium battery support 4S4P with 1.92kWh to Max. 30.72kWh so that you can easily DIY your battery system as you need. If one of the batteries in the bank malfunctions, you can quickly identify the problem through the mobile app.
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That thing is huge!
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I strongly recommend getting yourself a DC bench power supply so you can top balance the cells. The first one wasn't bad and I didn't need to balance it. The second one had like a .25V difference between the highest cell and the lowest cell which is waaaaaaay too much. It took a week but I got the difference down to .03V. The BMS will do it's job and balance but not if you are just using a charger.
Earlier this year I bought 4 of these for about $170 each ($0.09/w-h), which I thought was a great price. This price is at $0.067/w-h (6.7 cents). Only lower $/w-h price I've seen is the 280a-h version of this battery, which is now $0.064 cents/w-h).
I strongly recommend getting yourself a DC bench power supply so you can top balance the cells. The first one wasn't bad and I didn't need to balance it. The second one had like a .25V difference between the highest cell and the lowest cell which is waaaaaaay too much. It took a week but I got the difference down to .03V. The BMS will do it's job and balance but not if you are just using a charger.
https://www.amazon.com/dp/B09YSJQ...title
to do that job. In fact, you can set it do the entire charge, by first setting the constant current level and then the top off (absorption phase) constant voltage. I set that voltage to 14.4V (=4x3.6v), which completes the charge, allowing the BMS balancer to work without pushing a single cell over its limit.
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Yes, I found that the chargers I have go to 14.6v (=4x3.65V) for the absorption phase, which doesn't allow enough time for BMS cell balancing and pushes one cell over its individual 3.65v limit, tripping the BMS. I recently bought this power supply:
https://www.amazon.com/dp/B09YSJQ...title
to do that job. In fact, you can set it do the entire charge, by first setting the constant current level and then the top off (absorption phase) constant voltage. I set that voltage to 14.4V (=4x3.6v), which completes the charge, allowing the BMS balancer to work without pushing a single cell over its limit.
For LiFePO4, top balancing should be done at 14.6v (3.65v per cell, which will settle to a bit under 3.45v direct from each cell).
Subsequent to that, I never charge over 14 to 14.2v, which amounts to about 98% SoC (settling around 13.44v from the cell).
Sidenote: This is the best price I've seen, yet. I only wish they were not limited to one per purchase.
It was the humsienk 12v 100Ah
Took several days to balance, but BT BMS made it easy to watch at least.
I now have a ecoworthy 12V 280 Ah one coming lol. That things going to take forever to balance.
I'll be using the bench power supply for that, but ideally should use something with more heft like an actual high amperage 12v lifepo4 charger for doing the initial charging just to get through it faster...
I strongly recommend getting yourself a DC bench power supply so you can top balance the cells. The first one wasn't bad and I didn't need to balance it. The second one had like a .25V difference between the highest cell and the lowest cell which is waaaaaaay too much. It took a week but I got the difference down to .03V. The BMS will do it's job and balance but not if you are just using a charger.
The charger will typically apply something like 14.6V to the battery to charge it. As the charger charges the battery, each cell individually charges. However, they might not have all started at the same voltage, or due to individual resistances they charge at slightly different rates. The result will be that they each finish charging at a different time. Here's the problem though, the BMS is designed to prevent damaging the cells by overcharging them (above 3.65V per cell). On these Eco-Worthy batteries it does this by stopping all charging across all cells as soon as any single cell hits 3.65V. That's great, but what if the fastest charging cell hits 3.65V when one cell is still at 3.55V and two other cells are still at 3.40V? The cells are out of balance and because they are not fully charged you get less of the advertised capacity. That can also lead to long term degradation because some cells are getting charged more fully than others.
The good news is that the BMS is also supposed to balance out the voltage across the cells. The problem is that typically when you use a charger the cells charge too quickly for the BMS to balance them out before one of them hits 3.65V and the BMS stops all charging to prevent damage to the highest charged cell. That's the point of the charger, to get as much power into the battery as fast as it can safely do so. The charger has no way to know about balance, it just knows to provide a constant voltage. So that's where the bench power supply comes in. You hook it up, set the voltage to a lower voltage than 14.6V, like maybe 13.80V, and limit the current (amps) to maybe .80A-1.0A or so. That will slowly charge the cells and give the BMS time to use resistors to limit charging to high cells and to bring low cells up. I'm not an expert and I suspect that it may also be able to bring high cells down, at least that is what I observed a few weeks ago. You slowly up the voltage and eventually you will have a mostly balanced battery. I believe there are also active BMS systems that can shunt power from one cell to another, but that is not what eco-worthy or any cheap battery brand uses. Again, I am no expert, just a noob to batteries figuring this out for himself.
This is where the importance of having bluetooth comes in. The app will show you the voltage of each individual cell. Without it you would have to cut open the battery to find that out using a multimeter. You can also take a multimeter and if your fully charged battery is giving a DC voltage of less than 14.6V then you know that the BMS cut off charging before all the cells hit 3.65V. That doesn't tell you which cells are out of balance though.
I've heard that expensive brands like battleborn balance the cells from the factory before shipping. In my experience, eco-worthy does not balance them before shipping and their support will tell you that everything is fine.
I should say that maybe you could get it balanced using a charger if you went through a bunch of charge/discharge cycles (not 100% to zero, maybe 100% to 90% to 100% to 90% to 100% to 90%). The problem is that a charger is going to charge it from 90% to 100% in an hour or so but it would likely take several days to actually balance so you would need a lot of cycles. A bench power supply puts you in control without the BMS stopping charger which stops balancing.
Also, I assumed people know what a bench power supply is. Basically, think of a charger but that gives you total control over the voltage and current (amps). They both take AC power from the power outlet and convert to DC. The charger voltage is likely fixed at 14.6V (or maybe they vary, I don't know) for the charger, but the power supply lets you set it. Thus, you can use the bench power supply to slowly charge your battery which gives the BMS time to balance the cells.
I will say that these use a different BMS than the 100Ah model. That means that unfortunately they do not seem to be compatible with the overkill solar app which gives you waaaaaaaaaaaaaaaaay more information than the stock Eco-Worthy app.
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