12V 400Ah LiFePO4 Lithium Battery,5120Wh Energy Built-in 200A BMS 15000+ Cycles for RV,Solar,Home Energy Storage,Off-Grid Applications

I have purchased a total of 4 batteries. 2 from Amazon and 2 from the dumefume web site directly. they were purchased 1 battery a month. first and last purchases were from Amazon. the 2 that came directly from dumfume had a 13.0 and 12.9 volts. they both charged to 100 percent with no problems. the 2 that came from Amazon had 12.2 and 12.4 volts. they would not charge. i hooked another fully charged lifepo4 battery in parallel to the non charging battery. i then hook a 20amp charger to the non charging battery. it then charged fine. i waited 24 hours then recharged each of them. i was surprised that it took another 10-15 minutes of 20amp to top of all 4 batteries. This process was done when each battery had arrived. note that one of the batteries from Amazon came in with a hole in the box. the battery appeared not to be dented or damaged. PRO: 1: this dumefume 150ah lifepo4 battery is priced good. 2: i like the fact that it is not a smart battery. i have no cell phone and did not want or need the blue tooth feature. 3: external seems to appear to be well built does not feel cheap. no clue on interior. 4: they are light weight for the size and amperage of the battery. CON: 1: did not like the fact that i had 50% of the batteries were not able to be charged and needed a "jump" charge from another battery to get it to work. a little concerned on the bms settings because of this. i also wondered if this was caused from used cells or not. 2: no more room in the house for another battery purchase. NOTE: i have purchased these batteries to supply additional power when attached to a power station. they work great in recharging those power stations. these batteries are being used a power storage and will be sitting on the shelf for an emergency. it will be interesting to see how they hold up over time. i would have liked to see a teardown of the 150ah. there are a few online for the other amp hour versions. CONCLUSION: i like this battery. its a new frills, non smart lifepo4 that feels good to hold. dumfume does have good deals both on Amazon and there website from time to time. If i had room in my home and/or needed another battery i would purchase it again. only minor issue is the charging of this battery and long term (calendar time) will "age" well. i am happy with the purchase.

Excellent battery I use it with a converter and it has worked perfectly for cases of blackouts, charging cell phones. It's easy to connect, very useful practice. I totally recommend it.

Good batteries at a good price. One came DOA, and after I got a replacement for it, I finished cracking it open to see if it could be repaired in some way. (Do not do this unless you know exactly what you're doing as it is incredibly dangerous) While what the shipper did to it had unfortunately rendered it unsalvageable, I was surprised by just how well these are made. Ring terminals and screws rather than the poorly soldered connections common on 'budget' batteries, lots of foam padding that is properly glued on, and there was liberal use of some kind of rubber or silicone adhesive on anything that could come loose. I'm pretty sure it had to have fallen out of a moving truck for it to come DOA. As for the functional ones, I've cycled them a few times and even under a decent load they always pull at least rated capacity. But, that is to be expected considering that they're actually 314Ah cells under the hood. Whether that's what Dumfume intended, or if that's just what they got their hands on at the time, I don't know and I'm definitely not about to complain about it. The only issue I have with these is the odd size, and I knew that could be an issue going into it. The only battery box I've found that will fit these without being ludicrously large is a double GC2/Group 24 box, which is still a good bit too long for them. You'll have to do something custom if you want them fully enclosed. All in all though, I would not hesitate to buy more of these or another Dumfume battery. Like I said at the beginning, they are good batteries at a good price.

Worth every penny. This battery exceeded my needs and worked great on a my golf cart. Strongly recommend.

Recived my item and didn't get around to using it for a couple months. When the time came I removed it from the shipping box and charged the battery with a certified lifepo4 charger to full. I began testing the battery for capacity. Upon testing I got poor results. On average I only got 162 ah with a 300 ah battery. I contacted the company and received very poor suggestions on ways to fix the problem, which only lowered the capacity of the battery. Then the company sent me a return lable in chat that was a link in Chinese. Not wanting to compromise my compute and not trusting a foreign link the company said that I needed to ship the battery to them to test and they would determine if a replacement or refund was needed. Amazon was ZERO help. Don't buy from this company.

I have a 36v EZGO TXT 4 seater running on the 38.4v 100ah variety and 48v Cushman Hauler running on the 51.2v 100ah version. When I first hooked it up to my TXT cart there must have been a sudden high current spike which caused the BMS to cut the power. Capacitors in a controller that's been sitting unused can cause current spikes. Sitting on a steep incline will require a lot of amps to get moving. Sticky brakes or a stuck brake pedal will increase resistance and cause a spike in current. I was able to wake the battery up by hooking it up to a charger. I was very cautious and went easy on the accelerator initially, but now both batteries are hooked up and powering my golf carts. They seem to be well made. The batteries came with their own wired displays. The display that comes with the 48v/52.1v colorful version displays the battery voltage, battery percentage, and real time AMP draw while in operation, compared to the 36v/38.4v version which only gives voltage and estimated percentage remaining.

The 3840Wh rating is quite true. Great product. It doesn't overheat during discharge with a 875 watts heater fan and doesn't warm-up at all with a 15.5 amp charger but it does take many hours... which is perfectly normal. It is a pretty heavy battery so not very portable. It's nonetheless light if you consider the power output of this device!!! Just used it twice so a durability update might be necessary... To be continued...

Es perfecta y va muy bien

Great batteries, perform well. Highly recommend

Al momento ne ho istallato solo una ed è veramente ottima... Bisogna ricaricare la batteria prima di installarla perché per il trasporto viene caricata al 50%

Gute Batterie, keine Probleme