Hi there. I have a 100ah LiFeP04 battery (Renogy), a SmartBMV monitor (BMV-712) and a MPPT 100/20 controller. I've had this set up for a few seasons with no issues. I just installed a Webasto heater and am tinkering around with it. Today I got an error code on it saying it shut off because it was under voltage (<10.5 volts for more than 20 seconds). My SmartBMV says the battery is 100% full, but the voltage is reading around 10.5 volts. In addition to a few solar panels (not doing much today as it is winter and cloudy), I have a Renogy battery to battery charger. When I turn on the van, the voltage jumps to 14.5 volts. When I turn off the van, it falls back to 10.5 volts. Is this typical behavior? Is my battery just dead?