12V 50Ah LiFePO4 Lithium Battery 50A BMS,NewtiPower 10000+ Deep Cycle Lithium Iron Phosphate Battery Great For Winter Power Shortage, RV, Marine and Off Grid Applications (12V 50Ah)

These batteries are the best around. I have owned 4 200 Ah ones (10 kWh at 48V) for several years, which I used for an off-grid solar system out in the Texas desert. They have survived temperatures from 10 degrees to 120 degrees F (even hotter in the shed they were in) without any issues.I just bought 8 additional 300 Ah ones (another 30 kWh) and installed half of them. It is amazing how they can take or produce kWatts of power and not even heat up.The 300 Ah ones were cheaper and more compact than the old ones per kWh and they now come with a handy built-in Voltage and State-of-Charge meter.One thing to keep in mind when installing: use short, thick cables, preferably 1/0 AWG copper or better, and quality lugs. 100 or 200 amps is a lot of current!The batteries were delivered within a week from ordering and were very well packaged.A true quality product!

Our old lead acid batteries in our camper will no longer hold a charge. I have been searching for a LiFePO4 battery for some time and could not find the perfect one until I discovered this one. The stumbling blocks in my search were that many of them do not have low temperature cut off which is important to me because we occasionally camp in cold weather, or they were too big to fit in the standard 8" wide frame welded into our camper, or they were way too expensive. This battery checked all the boxes.This 200ah battery weighs just over 47lbs and replaces the pair of 100ah lead acid batteries that weighed 40lbs each, giving us the same or more capacity while only weighing roughly 1/2 as much. The photos show the old set up compared to the new.I did still struggle to find a battery box that this battery would fit in, and still fit inside my camper frame rails. Part of the problem is that the measurements of most batteries and boxes are too general making it difficult to tell if they would fit. In most cases the measurements are different at the top than at the bottom. This battery measures 13 7/8" L x 7 1/4" W at the bottom and 14 7/16" L x 7 1/2" W (including handle protrusions) at the top. The case measures 9 3/4" tall plus the terminals will stick up above that. I ended up using the Camco double battery box #55375 also purchased from Amazon. As you can see, everything fits together perfectly on the standard 8" wide camper frame rails. (I did have to cut out a divider that was between the original battery boxes on my frame rails). The extra space inside the battery box will provide room for the TPMS transmitter, battery monitor shunt, terminal blocks, and main disconnect switch. It will also allow a much neater wiring installation.Our camper's electrical system was designed for lead acid batteries and will not properly charge LiFePO4. I have been in contact with the camper power center manufacturer, WFCO, who makes an updated converter that will replace ours and I will be changing to it. Since it will be a little while until I can change the camper converter, the folks at NewtiPower were kind enough to send me a separate charger at no cost so I can use their battery in the mean time.NewtiPower customer service has been fast and has exceeded my expectations. I am very pleased with their products and service.

So glad I purchased these for my trolling motor. The weight, fit, ease of installation, and battery life are all very good. The built in battery meter is also a plus. The price was the best by far compared to other brands.

We needed to replace our 1800ah house bank of lead acid battery's that were now 5 years old and showing a significant reduction in capacity. That 1800ah consisted of eighteen 100ah 6v Golf Cart batteries, so it wasn't a small job to replace them. We did a significant amount of research before making this purchase in order to convince ourselves that the time was indeed right to switch to Lithium. The newhigher density, smaller case lithium batteries such as these is what sealed the deal for us. To be able to get the same capacity in six batteries as we had with eighteen and at 1/3rd the space and weight is a very good thing. And the fact that there's very little ongoing maintenance really tops it off.We have now had these installed just over one month and are very glad that we made the switch. It's been a good experience so far. They arrived in great physical condition because they were packaged very well, and they also arrived at nearly full charge. The continuous 13.2v +- of output from full charge to about 80% "depth of discharge" is a distinct advantage for all of the electronics on a boat, including all of the 12V pumps.It's a little bit difficult to judge the SOC (state of charge) of Lithium due to the nature of it's constant voltage, so you do need a good external BMS (Battery Management System) to track the AH (amp-hours) in and AH out of the battery. You should also make sure that you have a charging system that either has a Lithium mode or can be custom set for Lithium parameters. The surest way to kill a Lithium battery is to over charge it. Lithium charging is a two stage process with mainly a Bulk charge set to 14.6v (or slightly below) and a very short period of Absorption (no more than 10 minutes) at that same voltage. A Lithium charger does not have a float or EQ stage. This charging requirement applies to all of the charging sources on a vessel or RV: the Dedicated Charger, the Inverter/Charger, and don't forget your Alternator Regulator/Controller.If you need to change to Lithium prior to having the proper Alternator Regulator/Controller, make sure you can monitor the voltage going into the battery at the battery input posts and that it never exceeds 14.6 volts and that it's only at 14.6V max for no more than 10 minutes. In fact, while charging, the batteries should hover at around 13.5V +- and when fully charged will very quickly ramp to your set 14.6V. You should discontinue charging no more than 10 minutes after it has reached 14.6 Volts or you risk over charging and potential damage, and even a potential fire hazard.This is a very large decision and purchase for anyone needing to do so, so I will try to update this review after the first 6 months of use, or sooner if any changes.Edit:It has now been over 6 months and these batteries have been performing very well. The only difference that I can note is that there is now a more gradual ramp during the charging process between 13.8 and 14.5 volts. I have my generator fed chargers bulk setting to output 130 Amps at up to a maximum 14.5 Volts and the batteries will now stay in the range of 13.6 to 13.8 volts for 75% of the charging time. Then once at 13.8 +- volts they ramp quicker (25% of the total charging time) up to 14.5 Volts before they go to absorb set for 5 minutes.We also have 1kW of solar and find that on bright sunny days during the colder months (when the refrigerator and deep freeze don't have to work so hard) that we can go without running the generator at all during that day and any successive bright sunny days because our bank is sized large enough to carry the load allowing us to keep the SOC above 50%.all the best,dr