Detailed Specifications

ELECTRICAL SPECIFICATIONS CHARGE SPECIFICATIONS
Nominal Voltage 12.8 V Recommended Charge Current 1 A - 10 A
Nominal Capacity 20 Ah Maximum Charge Current 20 A
Capacity @ 25A 48 min
Charge Current 14 to 32 ºF
(-10 to 0 ºC)
≤0.1 C
Resistance ≤60 m @ 50% SOC
Charge Current -4 to 14 ºF
(-20 to -10 ºC)
≤0.05 C
Eiciency 99% Recommended Charge Voltage 14.2 V - 14.6 V
Self Discharge <3% per Month
BMS Charge Voltage Cut-O
15.2 V (3.8 ±0.025 vpc) (1.1
±0.4 s)
Maximum Modules in Series 3
Reconnect Voltage 14.4 V (3.6 ±0.050 vpc)
DISCHARGE SPECIFICATIONS
Balancing Voltage 14.4 V (3.6 ±0.025 vpc)
Maximum Continous Discharge Current 20 A
Peak Discharge Current 40 A (7.5 s ±2.5 s)
COMPLIANCE SPECIFICATIONS
BMS Discharge Current Cut-O 70 A ±10 A (20 ±5 ms)
Certifications
UN38.3 (battery)
CE (battery)
UL1642 & IEC62133 (cells)
Recommended Low Voltage Disconnect 11 V
BMS Discharge Voltage Cut-O
8 V (2.0 ±0.08 vpc) (140 ±60 ms)
Shipping Classification UN 3480, CLASS 9
Reconnect Voltage 10 V (2.5 ±0.10 vpc)
Short Circuit Protection 200-500 s
DIMENSIONAL SPECIFICATIONS
TEMPERATURE SPECIFICATIONS
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-O 158 ºF (70 ºC)
Reconnect Temperature 12 ºF (50 ºC)
*Refer to charge currents below 32°F (0°C)
MECHANICAL SPECIFICATIONS
Dimensions (L x W x H)
7.1 x 3.0 x 6.7”
181 x 76 x 169 mm
Weight 5.6 lbs (2.55 kg)
Terminal Type M6 x 1 x 12mm
Terminal Torque 35 - 44 in-lbs (4 - 5 N-m)
Case Material ABS
Enclosure Protection IP66
Cell Type - Chemistry Cylindrical - LiFePO
4
DATA SHEET
ENGINEERED
IN THE USA
RB20
Voltage: 12.8V | Capacity: 20 Ah | Energy: 256 Wh
relionbattery.com
+
1.803.547.7288 • TOLL FREE: [phone] | 1433 Dave Lyle Blvd • Rock Hill, SC 29730
RB20 DATA SHEET • 09.23.20