12V 300Ah Small-Volume LiFePO4 Lithium Battery,200A BMS,10000+ Deep Cycle Lithium Iron Phosphate Battery Great for Winter Power Shortage, RV, Marine and Off Grid Applications

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!

Purchased the Newtipower 12V 330Ah Iron Phosphate Lithium Battery almost a year ago for our RV--Rpod 178. The battery is much lighter than the lead acid the trailer came with and lasts much longer. We commonly camp off grid for extended times and coupled with 200 watts of solar power have never had a problem with power, even in November. This battery was less expensive too. Charge indicator on the top of the battery is handy too.

This is my second purchase from NewtiPower. The first was for my toy hauler camper in May of 2024. It was a 300 Ah and I am thoroughly happy with it. This one is for my slide in truck camper, 18 months later. I didn't even consider any other battery. After a great experience with the first, these are my go to battery and I have recommended it to many other people. Thank you for a great product at a great price.

I haven't run a full capacity test but so far it appears to be 300ah as claimed, it ran a dj system through an inverter at a festival for several days. More compact than competing batteries but it is still heavy! The rope handles do make it feasible for one person to move it around easily enough. Deducted one star because the built in voltage/capacity gauge does not agree very closely with my Fluke multimeter, and still read 100% when the battery was probably around 70% in reality.

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 new higher 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. Installed the batteries late in Sept, 2025. 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

As an avid camper who loves the freedom and simplicity of off-grid living, I was always limited by the traditional lead-acid batteries that powered my a-frame trailer. Frequent recharging, short lifespans, and the constant worry of running out of juice were all part of the experience. That all changed when I discovered the 12V 300Ah LiFePO4 Lithium Battery from NewtiPower. On my recent 5-day camping trip, I powered my entire setup with this battery and a 200W solar panel. From running my camper's appliances to recharging my cameras, lights, drones, and devices, I had no shortage of power. The battery's built-in meter provided real-time updates on its charge level, eliminating the anxiety of running out. One of the most impressive features of this battery is its durability. Even after days of constant use, it maintained a consistent charge. The support team was also incredibly helpful, sending me a free charger to complement my setup and all within just a few days!! Overall, the NewtiPower 12V 300Ah LiFePO4 Battery has completely revolutionized my off-grid camping experience. It has allowed me to focus on enjoying the great outdoors without the constant worry of power limitations. If you're looking for a reliable, efficient, and long-lasting power source for your off-grid adventures, I highly recommend this battery.