Battery preheat seems to be a bit more decoupled from cabin preheat as of late. I preheated this morning, and the battery heater icon stayed off. I just checked the app while charging @ 6kW, and the battery heater was on (see below). A few minutes later, it was off. Outside temps around 15F. With a 14-30, it's easy to confirm if either heater is running by looking at charge time remaining.
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I got 2019.40.2.3 last night with battery at 70% (non-capped). I'm currently charging to 90% to check cell voltages.