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That tester is called a DL24P. I like it. I got mine for $30 from aliexpress, But you can also find them for more than that on amazon or ebay. Basically it was the gateway drug for an Aliexpress account for me.

This is a great price. I haven't tested the Eco Worthy, but they have decent reviews. To get the price just find the item on ebay: ECO-WORTHY 12V 100Ah Lithium Iron Phosphate LiFePO4 Battery (2 Pack 100ah）For RV and use the coupon code which showed up automatically for me: SPRINGSAVE20

Interesting. This same battery is listed in a few places on amazon with different reviews. Search DJLBERMPW 12V 100Ah on amazon. The one with 196 reviews gets an A from Fakespot, The one with 79 Reviews gets a B and the one with 24 reviews gets an F. It's strange that they don't tell you how...

Couldn't you say that about anything you buy? Some brands have better quality control that others. The amazon reviews seem to do a good job of exposing the bad brands. I actually bought two of these last week from different sellers and both tested good. I have purchased and tested 6 brands of...

Back at $168 but only 5 in stock: https://www.amazon.com/DJLBERMPW-Upgraded-Lifespan-Trolling-Off-Grid/dp/B0CG1LQVLY

Both batteries exceeded their capacity tests at 104Ah and 103Ah. I've been charging one of them at 60A for the last 30min and that seems to be fine with no warming anywhere on the case. Everything looks great to me with these. No low temp charging protection which may be an issue for some, but...

I ordered 2 of these from amazon on Monday and they arrived yesterday. They look great and were packed well. There's an extra set of terminal bolts included. The batteries weigh in at 22lbs each and resting voltage was 13.25V on each one. Capacity test is underway. The price is up to $184.99...

Here's the youtube review/teardown.

Stunning Cyber Monday deal on this 12V 100AH battery right now at $167.99! ($0.127 per Wh) The is the lowest price I've ever seen so pull the trigger if you are in the market for one of these batteries. Despite the strange name this battery seems to perform well. See the tests in this thread and...

OK So here's the final ending of this saga. The seller is laughing at me and keeps saying "The corresponding price has a corresponding value." Which I think is Chinese for "you get what you pay for". Check the recent reviews of this battery which weren't posted when I ordered it. There are 7 new...

Interesting experiment involving blowing stuff up using a bank of 100 lead acid car batteries! Currents are in the tens of thousands of Amps. He actually tests a standard home circuit breaker at 26min and it performs surprisingly well.

My 100Ah Ogreen battery arrived yesterday it looks nice and was packed well. It weighs 13.1lbs. For some reason they didn't use aliexpress tracking system at all they just sent me a message in aliexpress with a fedex label that had the tracking number on it for the USA leg of the trip. I did two...

Yeah, I'm not feeling great about buying one of these from "Ogreen Lifepo4 cell Store". I purchased it on August 29th and there is still no tracking information on aliexpress. The seller messaged me and said "Dear friend, your parcel is expected to arrive at Hong Kong on the 9.25" but it's a...

I've heard the recommendations but I want to see the studies that quantify how much degradation there is.

That Renogy DCDC converter with MPPT seems like it's designed for what you are doing, but all the specs I read say the solar input is limited to 25V which is pretty low unless you are using several of those 100W "12V" panels you find on amazon in parallel. Where did you see that it's rated at...

I came across an additional study published in March of this year that does testing on LFP batteries repeatedly charged at −10 °C so I wanted to update this thread. This study focused on overcharging and so they used relatively high cutoff voltages of 3.65V, 4.0V, 4.4V, and 4.8V. They used CC-CV...

I just came across this paper that did some experiments on overcharging at low temperatures. They charged some cells up to 4.8V repeatedly and did a capacity test each time. They found low degradation at 0.1C 0.2C charge rate but much higher degradation at 1C. This was all done at -10C. It seems...

Wow that's impressive! 127Ah out of a 100Ah rated battery.

I haven't tested these, but I have several other cheap brands from amazon that capacity tested over their specs. This youtuber capacity tested the 300Ah version and he got 322Ah out of it. I'd like to see an actual test of the 100Ah version. I think it would be so cool if @Will Prowse would do...

Interesting results. That is disappointing if it really only has ~660Wh of capacity. A 12.8V 100Ah battery should have 1280Wh. Your testing methodology was a little hard for me to follow and seemed get interrupted. It would be good to repeat the tests you've done or see if you could do them with...

It's usually OK to connect the outputs of two chargers together as long as they both have similar output/float voltages. These batteries shouldn't be charged over 14.4V so as long as both chargers put out somewhere in the range of 13.5-14.4V It should be fine. A benchtop power supply is helpful...

I agree 1-2Nm is not that tight. It seems like they are warning you against overtightening it. Your electric screw driver is probably not accurate or calibrated to anything but probably in the right ballpark. 2Nm is equivalent to 20.4kg*cm. So if you applied a 1.6kg weight to the end of your...

Just ordered an Ogreen 12V 100Ah for $166.55 + free shipping. That's the cheapest by far that I've ever seen at $0.126/Wh. I'll do a capacity test with my DL24P when the battery arrives in a few months. I've had good luck with Aliexpress for the most part. Except one order in the past I got...

FYI These batteries are down to $229.00 plus free shipping on amazon now. That's about the cheapest I've seen for any brand. ($0.173/Wh)

Good Info! To put some example numbers to this, assume you have a 12V 1200W inverter during a max power surge from an AC compressor starting up. That surge might peak at 15A 120V. Which is 15A*120V=1800W. To attempt to supply that load, the inverter is drawing a lot of current from it's 12V...

If you are worried, you could do a capacity test to see if the capacity has been reduced. Do you know how to do that?

If you are having trouble getting broken leads and solder out of PCB holes, you might want to try a "solder sucker" or "solder wick".

Unless I purchased fake Bussman fuses, I dont see what the difference is where I bought them. If you are getting fuses from some trusted supplier that has personal relationships all the way up the supply chain to the factory in india then go for it, but just because it comes from aliexpress...

The Bussmann version of 180LET is available for under $10 (USD) from aliexpress.

Thanks, That's awesome. I think you mean they are in series not in parallel right? So that's over $1k worth of supercaps?

Could you give some more details about this 125F capacitor system you have please? Did you build it yourself out of supercaps or is it a 48V capable module you purchased? Can you measure or notice a difference in the startup of your pumps and A/C compressor with it?

Lithium iron phosphate comes to America Companies are planning the first large-scale factories in North America for the inexpensive battery raw material

Supercaps are about 50 times more expensive per Watt-hour than lithium batteries so maybe it would help, but you're probably better off just buying more battery. The cheapest supercap I could find is this one 2.7V 500F for $5.87 each. That works out to about $11.50 per Wh. That generously...

The startup time for the compressor on the little wine fridge ranged from about half a second to 2.5 seconds and averaged about 5A at 120V so that's roughly in the range of 300Watt-seconds to 1500Watt-seconds. My interest was primarily in being able to use a smaller inverter by reducing the...

After much delay I finally tested the fridge with various NTC thermistors. The results are pretty underwhelming and I don't think using a thermistor to reduce the inrush current of fridge compressors is that great of an idea, but I wanted to report what I found nonetheless. Again I'll mention...