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By certification 
Product Description
Battery type: ICR18650-3S2P
Nominal voltage: 11.1V
Nominal capacity: 5200mAh
Standard continuous discharge current: 0.2C
Maximum continuous discharge current: 0.5C
Working temperature: charging: 0~+45℃, discharging: -20~+60℃
Size: MAX 110.7mm * 69.0mm * 19.0mm
Internal resistance: ≤120mΩ
Protection parameters: overcharge protection voltage / per string 4.25V ± 0.025V
Over-discharge protection voltage 2.5V ± 0.08V
These are the main parameters measured by the monitor:
Total battery voltage
Half battery voltage
Current (Integrated Hall-effect sensor)
Temperature (Submersible probe)
Electrolyte level (Submersible probe)
Ah charged/discharged per cycle
Ah charged/discharged in total
State of Charge (SOC)
Number of cycles
In addition to battery-backup support, the monitor equiment performs the important function of monitoring the remaining capacity of the lithium battery and providing a warning before the battery reaches end-of-life. Because the open-circuit voltage of a lithium backup battery remains relatively constant over the majority of its life, accurate battery monitoring requires loaded-battery voltage measurement.
http://www.pt-battery.com/
