Excellent value! So far my impression is that there is no difference between these and my other branded bank of batteries costing more than twice as much. I have not measured the capacity directly but judging from my average daily use and voltage levels, there is no discernable difference.

Affordable price, excellent performance batteries. DUMFUME's customer service is outstanding; they respond via email the next business day. They take responsibility for their products.

I'm using it in my campervan. Even with all the LED lights and solar panels, the batteries in these new campervans drain very quickly. I was previously using three 122Ah lead-acid batteries, which barely lasted 3-4 nights on a camping trip. I just finished a 3-night camping trip using 300Ah Dumfume lithium iron phosphate batteries and the same solar panels; the voltage barely dropped below 13 volts overnight and returned to normal immediately in the morning. I should have done this years ago.

These batteries use top-of-the-line Grade A cells. Best of all, the company is very easy to communicate with. I encountered a few issues during installation because I ordered a discounted older model battery with their outdated Battery Management System (BMS). Initially, I thought I could handle it myself, but it turns out I'm not that smart. However, they were very patient and helped me troubleshoot the problem. They recently upgraded the battery's BMS. I'm making a YouTube video about the new battery installation process, and I'll post the link next month after testing.

Had an issue with one of the batterys but the customer service was great and they took care of it right away had me a new battery within four days

We have had no problems with set-up and charging and would recommend this product....

I have already built two solar photovoltaic systems using 12V 50Ah lithium iron phosphate batteries, and both systems have been very successful. These batteries feel solid, are lighter than lead-acid batteries, and have a longer energy storage time, which is especially important for off-grid loads. The 50A battery management system (BMS) with low-temperature protection provides peace of mind; so far, the battery charge-discharge cycles have been smooth without any issues. The packaging was also excellent—safe and reliable, and arrived well-protected. If you are building a solar system and need reliable energy storage, these batteries are definitely ideal for you. I would highly recommend them.

The battery performance is outstanding. One battery lasted for four consecutive days and could simultaneously charge a phone, a JBL speaker, and a coffee maker. I'm sure the performance will be amazing once I connect four batteries in series. And they're incredibly lightweight. Compared to other deep-cycle batteries I have, these are practically feather-light.

I'm using a Dumfume 24V 100Ah lithium iron phosphate battery to power a portable cross-band repeater for search and rescue. This lightweight lithium battery perfectly reduces the repeater's weight. While its initial cost is slightly higher than lead-acid batteries, it's definitely worth the money. Best of all, it has the full 100Ah lithium iron phosphate capacity, while lead-acid batteries likely only have about half that. I did a test with the repeater on and actively transmitting on a busy local channel. I expected the battery to last about 8 hours. It ran for 12 hours with the battery only down to about 60%! I also have an 18Ah lead-acid battery that powers my radio, and it only lasts about 6-8 hours. Thanks to Dumfume for providing such a high-quality, affordable battery. It's well-made, durable, and I'm sure it will last a long time!

I ordered two 12V 100Ah lithium iron phosphate batteries. They arrived almost a week ahead of schedule and were left at my doorstep. FedEx delivered them, and one of the boxes was badly damaged. There was a triangular tear in the front of the box, so I didn't have high hopes. I opened the damaged box first, took a few photos, and found that the battery itself had no visible damage. It was well-packaged inside the box, surrounded by thick foam. I tested the voltage, and everything was normal. I plugged in the charger, and it started charging immediately. Once fully charged, I connected it to my Bluetti, and it output a stable 100-120 watts as expected. I charged one battery first, then the other, and then connected them in series to my Bluetti, where they provided a stable 250 watts. Before doing all this, I contacted the seller, and they replied quickly. They were supportive whether I wanted to return them or not, and they asked for photos of the damage, which I did. Of course, time will tell, but so far, the batteries are performing as expected, and I always want to commend the companies that provide such responsive customer service. I don't have professional testing equipment, so all my tests will be based on real-world usage scenarios. I bought these batteries specifically to use with my power bank, so I could double the battery capacity without having to buy those ridiculously expensive dedicated batteries.

I've ordered many batteries from Dumfume. They always provide top-notch service and high-quality batteries! Their service consistently meets and exceeds my expectations. Once, I was installing a new shunt and charger. Since I wasn't sure of the correct values, I sent them a screenshot of the settings. Within hours, I received a corrected screenshot with the correct values, which I could print out and place next to my device. They've earned my loyalty!

I picked up this 12V 50Ah battery to replace an older battery that powered a small device, and the first thing I noticed was how much lighter it is than the one I used before. I’ve been getting a reasonable amount of runtime per charge, and it’s held steady across multiple uses. It’s not built for high-demand applications, so if you’re planning to run something with a heavier draw, you might need a higher-capacity option. For basic setups and smaller electronics, though, it’s been good so far.

These batteries are fantastic and work exceptionally well with electric trolling motors. They're about the same size as lead-acid car batteries, but lighter. I bought five; four for my 48V solar panels and the remaining one for my boat. They're sure to be well-maintained when not in use.

The battery is excellent, I used the battery for 8 hours this weekend. Trolling, spot lock, used different speeds and only used up 40% of the battery. This battery is the best!!!

We've been using this battery in our travel trailer for a few months now, and it's been fantastic! It's so much better than the two lead-acid deep-cycle batteries we used before, yet much lighter. And charging with a generator is incredibly fast. Our converter can charge at 50 amps with either shore power or generator power. Next, we plan to install solar panels so the battery will always be fully charged, eliminating the need for occasional generator use. While this battery should last many years based on its charge/discharge specifications, I'll definitely buy it again if needed. In fact, I might even buy another one to double the capacity, making it easier to handle consecutive cloudy days while camping in the wild.