Hi, I am looking for a BMS for 3S Li Ion batteries. It should be designed to protect against total discharge and Short circuit and what else you need to protect. Also I want to use my ESP 32 to query the charge status of the battery pack. Unfortunately, I don't know whether a BMS is also there to charge the batteries and whether you need battery balancing. I am brand new to this topic and glad about tips and board suggestions from you guys looking forward greetings Max
Depending on your affinity to dumpster diving I'd go for a readymade 11.1V battery pack from a notebook. They contain over- and undervoltage protection and a controller which you can query using SMBus - a slower version of I²C bus. The cells are already selected for equal performance so you could spare the balancing and charging is done via a constant-current first, constant voltage later circuit for 12.6V nominal charging voltage. Thy can also deliver high currents in case you need them.