Large Pulse Resistance™ (LPR)
Battery Sensor Technology

The Large Pulse Resistance™ (LPR) sensor technology developed by Argus overcomes  significant shortcomings of conventional sensor technology, such as voltage profiling, and coulomb counting or current integration.   

Argus LPR technology continuously (e.g. every 60 seconds) measures the DC internal resistance of the battery, and converts internal resistance to an appropriate capability value.  It has been known for many years that DC internal resistance is an ideal attribute to measure in order to understand state of charge and state of health of a battery.  However, measuring internal resistance of a battery while it is being used (dynamically loaded and charged) has not been possible before the invention of LPR technology.  

The LPR method applies a very short duration (approximately 1/3 of a millisecond) high current (approximately 100A) load to the battery. By measuring the battery voltage and current flow during the period when the load is applied and comparing that to the battery voltage without the load applied, the internal resistance of the battery can be determined and the present capacity can be calculated. 

Because the duration of the impressed load is so short and the internal resistance is determined by the difference in battery voltage between loaded and unloaded conditions (compared over a very short period of time), the measurement of internal resistance is not significantly affected by external loads (or a charger) applied to the battery.  The voltage of the battery can swing dynamically up and down as demanded by the duty load or charger while the battery is in use and LPR test accuracy remains high.

The significant advantage of LPR technology is that it can be applied to test a battery while the battery is being used.  With LPR, for the first time, battery internal resistance can be used to measure charge level (SoC%), present capacity, and state of health (SoH%) of a battery while the battery is being used.   

The BB Capacity Series and Argus' Embedded Sensor Technology uses LPR (and the more advanced DLPR technology) to determine battery State of Charge, State of Health, and any other related capacity attributes. 

Lean more about DLPR technology for battery monitoring.
Compare LPR to other monitoring methods
Lean about LPR technology for battery diagnostic testing