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Temgo 12V 300Ah Self-Heating Lithium Battery with Bluetooth APP for RVs, motorhomes, Off Grids, Trailers & Camper

SKU: 12V-300AH-ORJR-2
12 reviews
$569.99
Pre-order; estimated shipping date is around September 20th.
  • Built for Heavy Continuous Loads: Upgraded 200A BMS enables up to 2560W continuous power output. Capable of powering heavy loads including trolling motors, RV appliances and off-grid systems.

  • Cold-Weather Reliability: Equipped with BMS-managed automatic self-heating, this 12V 300Ah LiFePO4 battery turns on heating below 32°F. Heating stops at 41°F to allow regular charging. Its low temperature cutoff protection allows for more flexible use.

  • Smart Monitoring:Bluetooth for real-time battery status monitoring, allowing battery checks via the Temgo App for ultimate convenience.

  • Extended Battery Longevity: Grade A cells offers up to 5000 cycles and a up to 10-year service life. Designed for frequent heavy deep cycling, it brings outstanding long-term value.

  • Reliable After-Sales Support: Accessible 24/7 online service. Get 5-year technical support whenever you have questions about installation and operation.
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Services and Benefits

Local Warehouse Free Shipping

Free standard shipping on all orders.

Estimated delivery within 1–6 business days.

Excludes Hawaii (HI), Alaska (AK), and Puerto Rico (PR).

Free Returns

30 Days Hassle Free Returns

5 Years Lifespan

Backed up by technical support within 24hrs.
Description Specifications Reviews FAQs

Optimized for Low-Temperature Use

Frustrated with batteries that won’t charge in freezing weather? Temgo’s self-heating LiFePO4 battery solves that: when the temperature drops below 0°C, it automatically heats itself to 5°C before charging starts. This helps protect the cells from low-temperature charging damage and ensures efficient charging even in winter. So you can recharge your RV or boat battery confidently in subzero conditions, with the battery automatically warming up before charging—no manual warm-up required.

Temgo 12V 300Ah lithium battery with capacity of 3840Wh and 10-year long service life

Temgo 12V 300Ah lithium battery with capacity of 3840Wh and 10-year long service life

Intelligent Monitoring

The Temgo battery integrates convenient smart monitoring functions for effortless power management. Simply scan the onboard QR code to complete instant Bluetooth pairing. Real-time data including voltage, current, remaining capacity and temperature is clearly displayed on the built-in Touchscreen and Temgo App. You can keep track of battery operating status at any time and quickly identify overload, overheating and other abnormal conditions for worry-free power use.

Temgo 12V 300Ah lithium battery touch LCD screen and app monitoring

Temgo 12V 300Ah lithium battery touch LCD screen and app monitoring

Flexible Capacity Expansion

Start with the capacity you need and expand as your home power demands grow. Temgo’s LiFePO4 battery system supports up to 4S4P connections, allowing multiple batteries to be combined for greater energy storage and power output. Build your home energy system step by step and enjoy the flexibility to scale up for refrigerators, washing machines, air conditioners, and other high-power household appliances. Whether you need reliable backup power or additional energy storage for your home, Temgo makes it easy to build a system that grows with your needs.

12V 300Ah heated LiFePO4 battery with flexible capacity expansion up to 4S4P

12V 300Ah heated LiFePO4 battery with flexible capacity expansion up

Versatile Power For RV, Marine, Solar backup, Off-grid storage

Built with 12V 300Ah / 3840Wh large capacity and 2560W continuous high-power output, this Temgo LiFePO4 battery handles all heavy-duty power loads with ease. It delivers consistent, reliable power for home backup storage, RVs, yachts, fishing expeditions, off-grid solar setups. It stably supports refrigerators, lighting and various daily electronics, fully meeting long-duration power demands.

Temgo 12V 300Ah lithium battery for RVs, marine, home backup and off grid solar storage

Temgo 12V 300Ah lithium battery for RVs, marine, home backup and off grid solar storage

Flexible Input, Multiple Charge Sources

Grid power isn’t always within reach, whether you’re camping off-grid or running home energy storage. This LiFePO4 battery can recharge through an AC charger, solar system, or generator paired with a 12V AC-DC charger. Harvest solar energy during the day for RV and household use, or use an AC charger or generator to top up power when sunlight is lacking.

Temgo 12V 300Ah lithium battery with multiple charge ways

Temgo 12V 300Ah lithium battery with multiple charge ways
Specifications
    Dimensions & Weight 15.12*9.76*7.64 inch / 54.67LB
    Capacity 300 Ah
    Nominal Voltage 12.8 V
    Energy 3840 Wh
    Recommended Charge Voltage 14.2V - 14.6V
    Recommended Charge Current 60A (0.2C)
    Battery Management System 200A
    Max. Continuous Load Power 2560W
    Charge Temperature Range -20℃ to 50℃ / -4°F to 122°F
    Discharge Temperature Range -20℃ to 60℃ / -4°F to 140°F
    Low Temp Cut-off Protection (Discharge) -20℃ ± 4℃ / -4°F ± 7.2°F
    Terminal M8
    Self Heating Function Activates below 0℃, turns off at 5℃

Customer Reviews

Based on 12 reviews
83%
(10)
17%
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87.5
P
Pat Slagle
So far I haven’t had a chance to really test it out but I think/hope it will be great

So far I haven’t had a chance to really test it out but I think/hope it will be great.

M
M.N.A.S.N
Self Heating 12V 300ah battery (UPDATE 2026)

I purchased this battery in July 2025. I was going to do a 6 month review and forgot. Anyway I guess a 10 month review is good enough. So far I have cycled it 72 times has and to this day continues to maintain a 0.0001V difference between cells. Easily powers my 12V devices in my Class B for more than 72 hours before charging to full. The self heating mode works well as I charged it once when temperatures were below freezing. The Bluetooth is amazing as is this battery.

A
Anonymous
Work well so

Work well so far

A
Anonymous
Excellent quality batteries

Excellent quality batteries, Got all the bells and whistles, auto warming, Bluetooth, great value for price and the color is great

M
M.N.A.S.N
Self Heating 12V 300ah battery

I purchased the self heating 12V 300ah a couple of months ago in July. It was installed outside underneath the carriage of my Class B RV. This battery replaced my original factory 200ah battery and is almost 100 pound lighter and delivers all the power I need. To this day I only use it to power all my 12V appliances and lights which includes a 6 cu.ft. fridge. So far I have used it without charging it for more than 72 hours over 3 days that rained and was cloudy . So far it has exceeded my expectations. I will write a 6 month update review to see how reliable it will be. Right now this is doing what other more expensive dollars promise they will do but for $2000 less. The blue tooth on this battery works great but you have to be within 15 feet of the battery. It is too early for me to make a recommendation but I am using it daily and charging it daily and it works great. I don't discharge it all the way down but after 72 hours of use I still head 24% capacity. I don't let it get below 20% just my preference.

123
FAQs

What can a 12V 300Ah LiFePO4 battery power?
This 12V 300Ah Lithium Battery stores 3,840Wh of energy and can deliver up to 2,560W of continuous power. It is designed for demanding applications such as RVs, campers, marine systems, trolling motors, and off-grid power setups.

How does the self-heating system work on this 12V 300Ah battery?
The BMS automatically manages the built-in heating system. When the battery is connected to a charger and its temperature falls below 0°C (32°F), heating activates. It stops at 5°C (41°F), allowing normal charging to continue.

Can this 300Ah LiFePO4 battery be charged in freezing weather?
Yes. The automatic self-heating function is designed to support charging in cold conditions. When the battery temperature is below 0°C (32°F), the system heats the battery before regular charging resumes.

Why is the nominal voltage 12.8V instead of 12V?
A 12V LiFePO4 Battery consists of four 3.2V cells connected in series, giving it a 12.8V nominal voltage. The 12V designation refers to the electrical system it is designed to replace and operate in.

How much energy does a 12V 300Ah battery store?
With a 12.8V nominal voltage and 300Ah capacity, the battery provides approximately 3,840Wh, or 3.84kWh, of nominal energy.

What charger size is recommended for the 12V 300Ah Lithium Battery?
Use a LiFePO4-compatible charger with a charging voltage of 14.2–14.6V. The recommended charging current for this 300Ah battery is 60A (0.2C).

What does the 200A BMS protect the battery from?
The built-in 200A BMS provides protection against conditions such as overcharge, over-discharge, over-current, overheating, and short circuits, helping maintain safe and reliable battery operation.

Can I monitor this 12V 300Ah battery from my phone?
Yes. Bluetooth connectivity and the Temgo App provide access to real-time battery information. The built-in touchscreen also lets you check battery data directly from the battery.

Is this 12V 300Ah battery suitable for RV and off-grid systems?
Yes. Its high 3,840Wh capacity and 2,560W maximum continuous load make it suitable for RVs, campers, travel trailers, marine applications, solar storage, and off-grid power systems.

How long can this 12V 300Ah LiFePO4 Battery last?
The battery is designed for up to 5,000 charge cycles at 100% depth of discharge and up to a 10-year service life under appropriate operating conditions.

Can I build a larger system with multiple 12V 300Ah batteries?
Yes. Multiple 12V 300Ah LiFePO4 Batteries can be connected in series and parallel to expand the system. Follow the manufacturer's configuration requirements when building a larger battery bank.

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