Update: This product is available for purchase again.
AliExpress has
ECO-WORTHY 12V 150AH Bluetooth LiFePO4 Lithium Battery (1100700145) on sale for $149.91 - $26 (apply coupon code
RE25B at checkout) =
$124.91.
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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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.
Edit: one final point. As several people have pointed out, 14.6V is just the peak charging voltage. Nominal voltage is 4 x 3.2V = 12.8V. In theory, nominal voltage is the average voltage you would get from 100% to 0% charged. They are calculating the watt hours as 12.8V x 150Ah = 1920Wh.
Second edit: technically, if you had a very low amperage charger, like 1 amp or less, you could probably get away with balancing without a bench power supply. But who buys a 150Ah battery and charges it with a 1A charger? That would take 131.51 hours to charge from 0% to 100%.
Third edit: I wouldn't buy a bench power supply until you get your battery and check its cell voltages with the app after charging.
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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I only paid $354 for two of these with a $60 coupon on eBay. I'm not impressed with them at all. They barely hit the stated capacity. Have them connected in parallel to a 12V 3000W pure-sine inverter.
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 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.
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Seriously, how do you handle tariffs, when & how much to pay, or is it all a surprise at the very end to burn the buyer?
I bought one on one of the previous deals (at a higher price). Been doing really well. I have to pair it up with another, and this will fit the bill.
Did not have a problem "Top balancing"
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