Hello. I'm testing design of 12V 60Ah lead-acid batery charger, with using LTC4015. In first step I'm using DC2039A demo board. I need to have more informations about measuring battery serial resistance. There is big different in this number (ICHARGE_BSR register) while testing.
By the datasheet this depends on charging current, but there is not more informations. By setting run_bsr register, LTC4015 stops charging, calculate serial resistance of battery and continue with charging. But calculation of serial resistance is from which measured numbers? I think LTC4015 measure discharging current, because charging is stopped. I think the same sequence is used for testing new battery connection - LTC will use internel load to battery and mesure current from battery. Is it true, or measuring of serial reistenci is other? Which is accuracy?
I'm asking this question, becouse I need get precise battery serial resistance while charging. But measuring with demo board gives big different (2-3x) on the same battert. Tested with more batteries.