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!

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.

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.

Arrived well packed, charged with a victron smart charger at 30amps to a voltage of 13.8 with absorption till current was below 1 amp. Put a battery tester on it with a load of 10 amps till the voltage dropped to 12.0v, the meter showed 294ah, i fully suspect to of got the full 300ah if i let the voltage drop to 11.2v but didn't need to drain it to zero. The meter is nice but deceiving as it is more of a “voltage=capacity” meter than a state of charge meter that a lithium battery needs due to it flat discharge voltage. I am hapoy with it so far and would buy again as i have other meters to tell the true state of charge/capacity. Gave it four stars due to it delivering the rates capacity, minus one star due to the meter being deceiving.

I purchased two of these to wire in parallel (12v 600ah combined capacity) and feed a. 3500 watt inverter charger I installed in our Airstream. I needed two of these batteries to meet the amp requirements for the 30 second surge capability of the inverter. In this configuration, these batteries will start and run our 15k BTU rooftop Houghton heat pump in air conditioning and heat mode. Please note the Houghton unit is super efficient and has a built-in soft start capacitor — once started, it only draws 9 amps max when the unit is running, so two of these batteries in parallel will run the Houghton but not all day on batteries without solar, shore power, or a generator to re-charge them. I love these batteries but wish they had Bluetooth to check the health and voltage of each internal cell. I use a smart shunt to monitor state of charge so I cannot speak to the accuracy of the built in charge meter (but if it uses voltage to measure charge level, it is inaccurate for LiFePo4 chemistry). I am considering purchasing two more to wire in parallel and extend my trailer run-time even further. As a bonus — you can wire these batteries 4p4s, so if you have a 48v solar system for a cabin or home, you could wire 16 of these units together for a 48v 1200ah battery system (62KWh), or move up to their 600ah batteries and create a monster 124KWh of storage that could supply 1000 amps of current.

This battery was not fully charged when I received it. I charged it with a brand new LiTime 40 amp charger, which meets the battery’s performance specs and charging requirements in every way. (You have to request these specs from Newtipower - they are not included on the Amazon webpage.) I installed the battery and noted that it discharged by 30% within ONLY 20 minutes. This made no sense given the power (amp) draw was only 2.5 amps. A 30% discharge at 2.5 amps should have taken 36 HOURS, not 20 minutes. I recharged the battery again using a 200 watt Renogy solar panel with no problems. The battery then discharged abnormally yet again. When I attempted a recharge again with the solar panel the battery would NOT recharge at all (at ambient temperature in the 60F range). I contacted the seller to request a warranty refund. They refused and instead blamed me for the malfunctions. Bottom line: this battery is 100% non-functional and the seller will NOT honor their warranty. Also: no free returns so if you do return it YOU will have to pay big bucks for shipping 60 pounds back to the seller! Have filed an Amazon A-Z guarantee claim and hoping to get my money back. UPDATE: Amazon refused the A-Z Guarantee claim. The company messaged me to say they are sending another battery - no refund. Now plan on camping/travelling with an old AGM battery as backup. I just can't trust this product. UPDATE #2: Company promised a full refund over a week ago which has not been received. Interesting. The 300 amp hour battery I bought is no longer offered by the company on Amazon…

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.