VESTWOODS 12V 125Ah Lithium Battery, 1280W 100A-BMS Deep Cycle LiFePO4 Battery, 10 Years 15000 Cycles, Bluetooth Low-temp Portection for UPS, RV, Camper, Fishing, Marine, Security, Golf Cart, Truck

I am using four of these in parallel for my emergency solar back up system at my home / attached workshop. I was a little concerned when I first received them as they never seemed to charge past 13.4 volts. Since I am familiar with LifePO4 batteries having used them to upgrade my Golf cart and Ryobi mower among other things I knew I needed to run a few full discharge and recharge cycles. After several weeks they now will charge all the way up to 14.6, hold that for a couple hours and then slowly level off to 13.4 after several hours. I do get around 235 amp hours out of them which is what I expected. So I am now very happy with them.That said I have never tried nor will I use the Bluetooth monitoring option as they are located in my attached workshop it only takes a few seconds to manually check on them and I am aware that the Bluetooth monitoring on these is not accurate anyways.Another reason I purchased these is for the low temp charging cut off. In the winter when it gets to minus zero outside I don't always keep my shop heated because it gets expensive and I sometimes wait for temps to warm up a little before I fire up the shop heater. With my previous LifePO4 batteries (in my lawn mower now) I had to manually shut down the input power from my solar panels whenever it got close to 32 degrees f. Now I don't have to worry about it as the BMS in these will shut off charging when it gets below 32 degrees. For $599.00 each these are a bargain!

I had more problems setting my solar controller to work with it than I did getting their bluetooth software to work.I am not an expert on all the fancy specs and testing. All I've ever cared about with my solar systems and batteries is do they work properly and safely. Do I have enough energy storage? I am currently running three solar arrays and two separate battery banks.Last night after charging the battery to 100% I put it to my own test. I ran a Midea 8,000 BTU U Ac off it for about an hour. Then I ran an about 3100 or less CFM evap cooler off it for another two hours. All that while also running my 12v cooler as a freezer off it. Then after that testing I watched TV and used my laptop off it till bedtime. I was amazed it still had over 80% charge.My main battery system before trying this consists of 8 210ah FVP golf cart batteries. Thankfully the price of Lithium Batteries is becoming a more affordable option. I looked at bunch of them and decided to give the Vestwoods a chance. So far glad I did, and I will be back to buy another in a couple months.

Update 02/14/23 - I purchased two more of the 100ah batteries, currently running 12v in parallel until I purchase a 48v inverter, then I'll run them in series. This will probably be my last purchase of these as I'm going to go for a server rack battery for any future purchases.The third battery seems to have a cell that's lower capacity than the others, but it still pulled 101.29ah/1286.49wh before it hit low voltage disconnect so it's still hitting advertised capacity, and the 4th battery was better matched and pulled 104.2ah/1321.94wh. This is based on the first charge/discharge cycle so it will likely drop a couple AH after being cycled a few times.I caught the cell voltages on the 4th battery within a minute or so of low voltage disconnect in the app, and the voltages were 2569mV/2658mV/2642mV/2693mv. I'm not sure if the BMS is disconnecting when more than one cell dips below 2.65v, or if the actual disconnect is when the lowest cell is at 2.5v.The two newer batteries still have the inaccurate SOC indicator in the app, and have a bit more of a sloppy job on the top cover of the battery (there's a bit of ooze-out of sealant around the edges) but otherwise are identical to the first two.---Original Review:I purchased two of the 100ah and one of the 20ah batteries a few weeks apart.All three pulled slightly more than advertised capacity, which is expected for batteries made with new cells. Considering how many batteries for sale on Amazon are loaded up with whatever B-grade cells the manufacturer can find and a cheap BMS thrown into a plastic box, this is great as it suggests they are using new, reasonable quality cells.Review for the 100Ah batteries:I purchased two batteries, 3 weeks or so apart. Both shipped Fedex straight from Vestwoods and arrived in good condition and packaged well using double boxes and cut foam padding around the batteries. Both batteries woke up easily when using a charger designed for LiFEPO4 batteries. I connected my charger, waited a few seconds, then disconnected the charger, waited 30 seconds and re-connected the charger. After this they immediately started charging with no drama.I tested both batteries using a capacity tester. Both pulled more than full capacity, the second one slightly more than the first (though I had cycled the first one slightly before my tester arrived, which likely explains the difference as brand new batteries typically test above full capacity and settle after a few cycles). The first battery showed a result of 101.4Ah, the second 102.57Ah. This was testing at a 14 amp draw (.14C) as due to limitations of my capacity tester I was unable to test at .2C.I do have complaints about the app which is the primary reason I gave a 4 star review. The app for some reason wants your fine GPS location to function, or it refuses to connect to the batteries. If you deny access to your fine location it refuses to connect to the batteries. This is an unacceptable breach of privacy. I would strongly suggest using a tool to mask your location before using this app. Who knows what purposes Vestwoods is using this information for but I can't think of any legitimate reason to require it.The app is poorly designed as well, only letting you see one battery at a time without manually switching to another one. Also you're unable to name batteries, so if you have more than one you have to remember the serial number. I ended up labeling the batteries with the last 4 digits of the serial number using a label maker so I can at least tell them apart when I'm looking at them without squinting at the barcode.Also the SOC (state of charge) indicator in the app is grossly inaccurate. It shows 100% SOC when the battery is still actively charging and showing it's taking in multiple amps of current, and when discharging it suddenly goes from around 15% to 0% and keeps discharging. The only accurate way to see the SOC is to watch the individual cell voltage to approximate the state of charge. Based on these observations I estimate that when the app shows 0% SOC is at around 15%-20% capacity remaining, and when charging it shows 100% when the battery is actually at around a 90% state of charge. This is odd considering the cell voltages appear to be accurate. I'm not sure if they did this on purpose to try to keep you from discharging or charging the battery until the BMS disconnects, or just a bug.I didn't test the low temperature disconnect as I didn't want to risk damaging the battery if it didn't work. Before buying these however I did find forum posts from people who tested it and said it does indeed work, but take that with a grain of salt as many batteries say they have low temp charging protection but don't based on the reviews I've watched.If Vestwoods fixes the app to resolve these issues, I'd would say this is a 5 star product given it's price point. I paid a price comparable to a Chins battery on sale and the Chins don't have low temp charging protection and don't have the Bluetooth connectivity. But until the issues with the app are resolved, especially the location privacy issues, I can't give this more than 4 stars.20ah battery review:I picked this up primarily because it fit perfectly next to my Bluetti EB3A in the case I bought for it (see Amazon item B09CPM2VNT). I wired up a XT60 connector to the battery and bought an adapter from XT60 to the solar input on the Bluetti and this battery more or less doubles the capacity of the Bluetti in an emergency if no solar is available, minus MPPT losses, and still lets me connect it to other appliances if needed.The 20a battery was shipped by Amazon and arrived with several other items I ordered in a plain cardboard box. The packaging of the 100a batteries shipped straight from Vestwoods was much better.I tested the capacity with my tester using a 4 amp load (standard .2C load considering it's a 20a BMS) and it tested out at 20.28Ah/256.35Wh. This was after being cycled a couple of times too.It's at a decent price point as well, and especially if the low temp charging cutoff actually works (I didn't test it as I didn't want to risk damaging it) it's a good value.

I ordered this unknown (to me) brand battery based on the review by Will Prouse regarding the build quality, the low temperature shut off, bluetooth monitoring, 200 amp charging, and the super low price. Battery arrived very well packaged. The terminals are high quality and solid. There are rope handles which is nice because its a beast.I charged it up with a 15 amp Victron smart charger, and installed the phone app. Note that for android the app is not currently in the app store and has ro be installed from the apk file, and some people wont be comfortable with that. Hopefully they fix that soon.Once installed the app has worked perfectly. I was able to see that it started at 40% charge, and charged overnight to 100%. The voltage of each of the 4 cells in shown and I could see they are balanced.In the morning I connected a Renogy 2000 watt inverter, powered a blow dryer, and monitored with the app that the power drawdown was appropriate. There's also a temperature indicator in the app.I can't comment on how this battery will last over time, but based on build quality and initial performance I fe great about it. With the discount I paid less that $900 for a 250 ah battery with 200 amp charging and that is amazing.