2 pack 12V 100Ah LiFePO4 Lithium Battery 100A BMS, 6000+ Cycles, 1280Wh Group 31 Rechargeable Battery High Energy Density, Ideal for RVs, and Off-Grid Applications

There batteries came partly charged and well-packed. I bought them to replace 2 Battle Born 100 AH LiFePo batteries that were 7 years old and not putting out full power any more. The Dumfumes are working great, charging fast and effortlessly powering my microwave through a 2000 watt inverter with little voltage drop. Check out Will Prowse's tear down on YouTube where he finds them of very high quality! These batteries are an outright bargain.

These things are a huge upgrade and perfect for my boat. I never have to recharge them and they last MULTIPLE trips out onto the lake, even with music blasting and using my trolling motor for a couple of hours. I ended up also upgrading the entire electrical on my boat to these, besides the starter battery because these are not recommended for that. Also I had to make a separate circuit so that the engine doesn't charge this battery because its an older style motor with a rectifier that isn't supposed to charge a battery like this.

Excellent, solor saturation 80 to 93 during day. Fit perfectly ( Mini), Light also . So far would buy again,

Great price, great performance, and amazing supportWe bought a new camper with a 12v fridge, two lead-acid batteries, and 200w of solar. On our first trip the batteries didn’t even last through the night, so I started looking into lithium. Dumfume had solid reviews and was half the price of the big brands, so I gave it a shot.The difference was huge. The Dumfume battery kept the fridge running all night—even on cloudy days—charged much faster than my old setup, and even let me run the Keurig in the morning without issues. It recharged to full in about 20 minutes. I realized I didn’t even need a second solar panel.On a later trip the battery failed unexpectedly and wouldn’t charge. I contacted Dumfume through Amazon and was impressed: support responded quickly, walked me through troubleshooting, and when the battery wouldn’t recover, they shipped me a replacement by FedEx 2-day so I’d have it before my next camping trip. I didn't expect that. I expected maybe a partial refund at the most. I was in a real bind too because my next trip was in a week and all the other batteries I saw on Amazon wouldn't be shipped in time.For the price, performance, and the level of support, this battery is absolutely worth it.

High quality and well built. Works great for my trolling motor setup.

We purchased this battery to replace the lead acid battery our camper came with. It is a big battery, but I was able to fit it under the bench in our camper where the rest of the wiring was. I was able to go two days of boon docking while not trying to conserve battery life before charging and never got below 40% battery life. We were running our fridge and hot water tank on propane (both still use a little electricity to light), two vent fans, lights, at night, the radio, charge or phones, my dad's hearing aids, apple watches, air pods, and the water pump.I watched some YouTube reviews on other size battery's this company offers, and they all seem to be built really well. This brand has ender temp and over temp protection that actually works. I bought this to use, not review so I will not be tearing mine apart to confirm this, but I watched multiple videos from multiple sources. I do wish I had the extra money to buy the 300-ah battery. It is smaller and has a larger capacity, but for $268.00 I couldn't pass up this deal. If I decied to upgrade again, I will probably buy two of the 300-ah battery and move this one to my popup.

Well i have not finish setting up yet. but so fare it is a great battery long lasting and multi purposed a good product of the 21 century and getting Better.THANKS AMAZON for being a connecting force and the market today.appreciate it

The battery is advertised at 48v 100 ah. When received, I charged at a constant current, constant voltage, with a desktop power supply set to 58.4v and 5.0 amps until the BMS shut down the charge at 55.2v. I then discharged at a constant current of 2.75 amps DC (well within tolerance). The batterys BMS shutdown the discharge at 52.5v well before the max discharge of 40 v and only allowed discharge of 78 ah total. A second test was run yeilding almost exact result. The vendors replys were all met with exact answers and additional testing but all they claimed was that was acceptable due to line loss and inefficiency. 22 Ah losses are not negligible, and i did not utilize any dc to ac conversion or high discharge rates, nor did i have large line losses though 12 in of wire at 2.75 amps, and i feel their is something discrepant, or the battery was mis-represented in the ad. Beware no returns are accepted sobif you get a bad one you are out 600+ dollars without any recourse.UPDATE The seller eventually sent a return shipping lable to correct this issue. Prior to returning, i decided to cycle the battery fully a few more times, and low and behold, the bms began to function properly. I am now getting the advertised output, (actually better 106ah). Needless to say if it keeps functioning as advertised this is an excellent value.