PRICE: $3,960.95

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The RB300-LT is a 12V 300Ah lithium battery and is part of RELiON’s Low-Temperature Series. This lithium iron phosphate battery is specially designed for cold weather performance. RELiON’s LT Series batteries can safely charge at temperatures down to -20°C (-4°F) using a standard charger. The system features proprietary technology which draws power from the charger itself, uniformly heating the cells within the battery to 41°F (5°C), so that it can be charged at its full recommended current. LT batteries require no additional components such as heating blankets.

The entire process of heating and charging with the LT Series is completely seamless. Simply plug the battery into the regular lithium charger and the internal heating and monitoring system takes care of the rest. Because it takes time to heat the cells, the charging process in below-freezing temperatures could take a little longer.

The Low-Temperature Series battery has the same size and performance as other RELiON batteries but can safely charge when temperatures drop as low as -20°C using a standard charger. Chilly nights off-the-grid are now easier with the RB300-LT - perfect for RVs, Sprinters, Class A and Class C vehicles, and more!

  • Voltage: 12.8V
  • Amp Hours: 300Ah
  • Length: 20.6 in (522 mm)
  • Width: 10.5 in (267 mm)
  • Height: 8.7 in (220 mm)
  • Weight: 76.1 lbs (34.54 kg)
  • Backup Power
  • Recreational Vehicles


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Nominal Voltage 12.8 V
Nominal Capacity 300 Ah
Capacity @ 25A 720 min
Energy 3840
Resistance ≤30 mΩ @ 50% SOC
Efficiency 99%
Self Discharge <3% per Month
Maximum Modules in Series 1 (Single-use)


Dimensions (L x W x H) 20.6 x 10.5 x 8.7” (522 x 267 x 220 mm)
Weight 76.1 lbs (34.54 kg)
Terminal Type M8 x 1.25 x 2mm
Terminal Torque 80 - 100 in-lbs (9 - 11 N-m)
Case Material ABS
Enclosure Protection IP66
Cell Type - Chemistry Cylindrical - LiFePO4


Maximum Continuous Discharge Current 100 A
Peak Discharge Current 200 A (7.5 s ±2.5 s)
BMS Discharge Current Cut-Off 280 A ±50 A (9 ±4 ms)
Recommended Low Voltage Disconnect 11 V
BMS Discharge Voltage Cut-Off 8 V (2.0 ±0.08 vpc) (140 ±60 ms)
Reconnect Voltage 9.2 V (2.3 ±0.1 vpc)
8.8V 2.2±0.3V/cell
Short Circuit Protection 200-600 μs


Recommended Charge Current 15 A - 50 A
Maximum Charge Current 100 A
Charge Current 14 to 32 ºF (-10 to 0 ºC) ≤0.1 C
Charge Current -4 to 14 ºF (-20 to -10 ºC) ≤0.05 C
Recommended Charge Voltage 14.2 V - 14.6 V
BMS Charge Voltage Cut-Off 15.6 V (3.9 ±0.05 vpc) (1.0 ±0.5 s)
Reconnect Voltage 15.2 V (3.8 ±0.05 vpc)
Balancing Voltage 14.4 V (3.6 ±0.025 vpc)


Discharge Temperature -4 to 140 ºF (-20 to 60 ºC)
Charge Temperature -4 to 113 ºF (-20 to 45 ºC)
Storage Temperature 23 to 95 ºF (-5 to 35 ºC)
BMS High Temperature Cut-Off 176 ºF (80 ºC)
Reconnect Temperature 122 ºF (50 ºC)


Heating Temperature Range -4 to 50 ºF (-20 to 5 ºC)
Heating Time 1.5 hr @ 15 A


Certifications UN38.3 & CE (battery)
UL1642 (File# MH64523) (cells)
IEC62133 (cells)
Shipping Classification UN 3480, CLASS 9



How to Read RELiON's Data Sheets

We know that Data Sheets can sometimes be confusing, overwhelming, or difficult to decipher. In this Tech Video, one of our experts breaks down how to easily read our Data Sheets.

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Introducing the new RB50-LT & RB300-LT

RELiON's Low Temperature Series batteries have been a hit with remote monitoring, off-grid enthusiasts, RV adventurers and more. So, we’ve decided to add two new models in this unique lineup. Learn more about the RB50-LT and RB300-LT and their suggested applications!

Tech Tuesday | Low Temperature Series

When temperatures dip below freezing, you need to make sure your battery can stay warm and charge the way it normally does. In this Tech Tuesday, we're discussing RELiON's LT Series and how to use our batteries in colder temperatures. Be ready to prep your set-up for winter!

Frequently Asked Questions

How do LiFePO4 batteries perform in cold temperatures?
As with all batteries, cold temperatures will result in reduced performance. LiFePO4 batteries have significantly more capacity and voltage retention in the cold when compared to lead-acid batteries. Important tips to keep in mind: When charging lithium iron phosphate batteries below 0°C (32°F), the charge current must be reduced to 0.1C and below -10°C (14°F) it must be reduced to 0.05C. Failure to reduce the current below freezing temperatures can cause irreversible damage to your battery. RELiON’s LT Series is specifically designed for cold charging, utilizing charge current to heat the battery before allowing charge. With the LT series, you can start the charge below 0°C (32°F).
How does the RB300-LT (Low Temp) battery work?
The RB300-LT features the same size and performance as RELiON's RB300, but can safely charge at temperatures that drop below 32°F (0°C) using a standard charger. The system features proprietary technology which draws power from the charger itself, requiring no additional components. The entire process of heating and charging is completely seamless for the user. Simply plug the battery into the regular lithium charger and the internal heating and monitoring system takes care of the rest. Because it takes time to heat the cells, the charging process will take a little longer in below-freezing temperatures.
How does the heating element work?
The battery management system monitors the internal temperature of the battery. If the temperature drops below 32°F (0°C) and a charge cycle is initiated, the BMS will divert charge current to the heating element until the uniform internal temperature of the battery is safe for charging. The specific safe charging temperature differs. For small batteries it's 50°F (10°C), for larger batteries it's 41°F (5°C). See individual data sheets for details.
How long does the heating element take to warm the battery to a safe temperature?
About one to one and a half hours. Depending on how cold it is and which model of battery, the BMS will divert 5-15 amps of charge current to the heating element.
Does the heating element keep the battery warm during discharging also?
No, during discharge the heating element remains off. The battery will function according to the discharge voltage characteristics at various temperatures chart. It is perfectly safe to discharge in temps down to -4°F (-20°C).
How many amps does the heating element draw?
Depending on battery model the BMS diverts 5-15 amps to power the heating element. The RB20-LT draws 5 amps while the RB300-LT draws 15 amps.
Can I use Low-Temperature (LT) batteries on my boat?
Yes, LT batteries may be used on your boat but keep in mind the heating element only engages during charging when temperatures drop below 32°F (0°C). You may not receive the full benefit of LT technology because watercrafts are likely not operable in extreme winter temperatures.
Can I connect my LT batteries in series/parallel?
LT batteries may be connected in parallel only. Series connections are NOT allowed.
How is a shunt-based battery gauge effected by heating during a charge cycle?
A shunt-based gauge is not able to differentiate between heating amps and charging amps. Because some of the amps were diverted to heating and did not contribute to charging the gauge may read 100% before charging ends. Please allow your charger to complete its cycle even if the gauge reads full.
How can I determine the state of charge (SOC) of my lithium iron phosphate battery?
The best way to determine the SOC of your battery is to use a battery indicator— a high-precision instrument that captures instantaneous and integrated data in real-time. RELiON’s battery indicator uses a 500A shunt to accurately measure the discharge/recharge currents and calculates the Ampere-hours (Ah) flowing in and out of the battery.


Our team of dedicated LiFePO4 specialists can help!

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