12V 20Ah
Cold Weather Deep Cycle Lithium Battery


12V 20Ah
Cold Weather Deep Cycle Lithium Battery

The RB20-LT LiFePO4 battery is specifically designed for cold weather performance, as it can safely charge at temperatures down to -20°C (-4°F). The RB20-LT is ideal in a variety of applications including small solar energy systems, remote monitoring, LED lighting and traffic control cameras.



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Cold Weather Ready

Safely charges in freezing climates (-20°C or -4°F). With a robust system that draws power from the charger itself, LT models do not require additional components – such as a heated blanket – to bring the battery to a safe temperature for charging.

Maintenance Free

Plug, play, and charge. No watering, no corrosion.

Long Life

RELiON lithium batteries provide up to 10 times longer life than lead-acid batteries, and they still provide 80% of the rated capacity after 3,500 cycles.

Fast Charging

RELiON lithium batteries charge much faster than traditional lead-acid batteries, and they’re packed with more usable energy and up to 10 times longer life so you’re always ready to go!

Partial State of Charge Tolerant

Partial charging does not affect performance quality or battery life. A low self-discharge rate means worry-free storage so even occasional users can be assured of reliable performance.

Constant Power

Full power available throughout discharge. Voltage does not drop like lead-acid.

Eco-Friendly & Safe

RELiON lithium batteries are the ultimate clean energy. No gassing, no fumes, and no pollution. Enjoy reliable power, while protecting the environment, using these non-hazardous batteries.



Electrical Specifications

Nominal Voltage 12.8V
Nominal Capacity 20 Ah
Capacity 48 min
Energy 256 Wh
Resistance ≤45 mΩ @ 50% SOC
Efficiency 99%
Self Discharge <3% per Month
Maximum Batteries Connected in Series 1 (Single Use)

Mechanical Specifications

Dimensions (L x W x H) 7.1 x 3.0 x 6.7” (181 x 76 x 169 mm)
Weight 6.6 lbs (3 kg)
Terminal Type M6 x 1.0
Terminal Torque 35 - 44 in-lbs (4 - 5 N-m)
Case Material ABS
Enclosure Protection IP66
Cell Type - Chemistry Cylindrical - LiFePO4

Discharge Specifications

Maximum Continuous Discharge Current 20 A
Peak Discharge Current 40 A (7.5 s ±2.5 s)
Discharge Over-Current Protection 50 A ±8 A (32 ±8 ms)
Recommended Low Voltage Disconnect 11.0 V
Discharge Under-Voltage Protection 8.0 V (2.0 ±0.08 vpc) (20 ±8 ms)
Reconnect Voltage 9.04V (2.26 ±0.34 vpc)
Short Circuit Protection Response Time 100-600 μs

Charge Specifications

Recommended Charge Current 1 A - 10 A
Maximum Continuous Charge Current 20 A
Recommended Charge Voltage 14.2 V - 14.6 V
BMS Charge Voltage Cut-Off 15.6 V (3.9 ±0.025 vpc) (1 ±0.3 s)
Reconnect Voltage 14.6 V (3.8 ±0.050 vpc)
Balancing Voltage 14.4 V (3.6 ±0.025 vpc)

Temperature Specifications

Discharge Temperature -4 to 140 ºF (-20 to 60 ºC)
Charge Temperature -4 to 113 ºF (-20 to 45 ºC)
Recommended Storage Temperature 23 to 95 ºF (-5 to 35 ºC)
BMS High Temperature Cut-Off - Discharge 185 ºF (85 ºC)
BMS High Temperature Cut-Off - Charge 140 ºF (60 ºC)
Reconnect Temperature 122 ºF (50 ºC)

Heating Element Specifications

Heating Temperature Range -4 to 50 ºF (-20 to 10 ºC)
Heating Time Approximately 1 hr @ 3 A

Compliance Specifcations

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

Performance Characteristics

Charge Voltage Char Chart 12 V graph
Charge Voltage Soc Chart 12 V graph
Discharge Voltage At Various Rates 12 V graph
Discharge Voltage Chart 12 V graph
Life Vs Lead Acid Chart graph
Cycle Life Vs Depth Discharge Chart graph


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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 RB20-LT battery work?
The RB20-LT features the same size and performance as RELiON's RB20, but can safely charge at temperatures that drop below 0°C (32°F) 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.

The RB20-LT Is Great For Powering

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Renewable Energy

More about RELiON's LT Series and how to use our batteries in colder temperatures.

We're Invested In Our Lithium Iron Phosphate Batteries

Lithium Certifications Recycling 1000X300