Battery voltage

Post date: Nov 9, 2019 11:06:32 PM

Using the tool in previous post, the battery voltage information was located at message 0x6D, bytes 0 and 1. Again, a binary-point representation is used, but this time with 5 bits for the fraction. I printed the battery voltage during runtime until the battery was empty and the UPS's outlet shut off. Since the battery is still the original one from 2016, I only got 5minutes of effective runtime.

During charging the reported voltage is 27.1875V. At the end of discharge, the voltage goes down rapidly until it reaches ~21.2V:

I will check the actual voltage with a multimeter, since I have a plan to replace the lead-acid battery with Lithium cells.