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The RB35-LT is a 12V 35Ah 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, requiring no additional components.

The entire process of heating and charging with the LT Series is completely seamless. Simply plug the battery in to 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 RB35-LT is ideal in a variety of applications including small solar energy systems, remote monitoring, LED lighting and traffic control cameras. It has all the benefits of lithium batteries including installation flexibility and no maintenance, with the added ability to charge in cold weather climates. It’s equipped with an M8 terminal type and a built-in battery management system (BMS). The RB35-LT battery meets UL, UN and CE certifications.

  • Voltage: 12.8V
  • Amp Hours: 35Ah
  • Length: 7.7 in (195 mm)
  • Width: 5.2 in (131 mm)
  • Height: 6.7 in (171 mm)
  • Weight: 10.8 lbs (4.91 kg)
  • Solar



Electrical Specifications

Nominal Voltage 12.8V
Nominal Capacity 35 Ah
Capacity @ 25A 84 min
Energy 448 Wh
Resistance ≤30 mΩ @ 50% SOC
Efficiency 99%
Self Discharge <3% per Month
Maximum Modules in Series 1 (Single Use)

Mechanical Specifications

Dimensions (L x W x H) 7.7 x 5.2 x 6.7” 195 x 131 x 171 mm
Weight 11 lbs (4.9 kg)
Terminal Type M8
Terminal Torque 80 - 100 in-lbs (9 - 11 N-m)
Case Material ABS
Enclosure Protection IP56
Cell Type - Chemistry Cylindrical - LiFePO4

Discharge Specifications

Maximum Continuous Discharge Current 35 A
Peak Discharge Current 70 A (7.5 s ±2.5 s)
BMS Discharge Current Cut-Off 80 A ±8 A (32 ±8 ms)
Recommended Low Voltage Disconnect 11V
BMS Discharge Voltage Cut-Off 8V (2.0 ±0.08 vpc) (20 ±8 ms)
Reconnect Voltage 9.04V (2.26 ±0.34 vpc)
Short Circuit Protection 100-600 μs

Charge Specifications

Recommended Charge Current 17.5 A
Maximum Charge Current 35 A
Recommended Charge Voltage 14.2V - 14.6V
BMS Charge Voltage Cut-Off 15.6V (3.9 ±0.025 vpc) (1 ±0.3 s)
Reconnect Voltage 14.6V (3.8 ±0.050 vpc)
Balancing Voltage 14.4V (3.6 ±0.025 vpc)

Temperature Specifications

Discharge Temperature -4 to 140 ºF (-20 to 60 ºC)
Charge Temperature 32 to 113 ºF (0 to 45 ºC)
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)

Heat Element Specifications

Heating Temperature Range -4 to 50 ºF (-20 to 10 ºC)
Heating Time Approximately 1 hr @ 5 A
BMS Heating Element Cut-Off 158 ºF (70 ºC)

Compliance Specifications

Certifications CE (battery) UL1642 & IEC62133 (cells)
Shipping Classification UN 3480, CLASS 9

Performance Characteristics



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