2/17/2024 0 Comments Quicklynks bm2![]() So, the BM2 reported soc is based on voltage and elapsed time, probably just some very very incredibly slow averaging routine.īelow the voltage chart is another chart showing a quick example of the very slow change in BM2 reported soc for a step change in battery voltage. However, it is many minutes later before the soc starts to change up or down. I noticed that if I changed the voltage while the BM2 was running, the BM2 reported voltage changes correspondingly within a few seconds and the fast 5 minute curve follows within seconds as well. Now the reason I had to re-connect the BM2 for every voltage above is that on boot, BM2 just uses its standard 12V battery BM2 chart (albeit not our chart as explained above). According to the Hyundai tech notes, the 2022 I5 aux battery is a flooded cell type which should be 0% soc at 11.6V, not 12.0V. Not a huge issue for our general use, however I believe the standard 12V battery BM2 calibration of 0% soc at 12.0V to 100% at 12.6V, to be off from our standard 2022 aux battery. Next, using a power supply (a settable voltage reference), I re-connected the BM2 to reset it for each different voltage on the chart below for the BM2 standard battery. ![]() Just an aside, there are fast spikes to 8-10 mA, however the average is much lower at about 2.3 mA. I got the QUICKLYNKS Bluetooth4.0 Battery Monitor II (Amazon).įirst note is the spec of 1.5 mA load current, no big deal, but my average load current is 2.3 mA, still no issue for harmlessly living on the battery. ![]() I took a quick look at BM2 today on the lab bench.
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