I'm building a 4S 12 Volt battery with EVE 280 AHr cells. I plan to heat, and possibly cool them inside a Group 27 Marine Battery Case. I'll be replacing 4 6-volt, 150 AHr AGM batteries. While I was considering options for temp sensing for the heating pads in the bottom of the battery case, I got to thinking that my current AGM batteries in my motorhome have three separate battery temperature monitors on the batteries. There are two "stick on" pads, one of which I think went to the old inverter/charge which was replaced before I bought the coach with a Victron 3000KW MultiPlus. I think the Victron MultiPlus temperature sensor is currently bolted on the Negative terminal of the battery bank. I'm not sure what the 3-rd temp sensor goes to yet (2nd stick on sensor). I know I'll want to move the Victron Temp Sensor to somewhere it can get useful battery temperature. I'm not planning on the BMS being the sole control for my system. I will have 3/8" Battery Terminals mounted through the plastic battery box lid, but mounting the sensor to that will not work. That terminal is thermally insulated from the batteries and won't reflect battery temperature. So, I'm sure this isn't a unique situation so I'm curious what others have done. I would prefer a solution that doesn't require me to take the top off after the batteries are in place, just to connect a temp probe. I'm considering a multiconductor connector mounted on the battery lid. I'll want to pick up ground after the Victron Shunt which is bolted to the wall in the battery compartment. I want to do this so I can measure the battery consumption of the heaters and have a more accurate SOC on my Victron BMV.