I am not sure if one has to do with the other but I am no expert. I just installed this update in my Legacy. My wife has been driving that car and had the same issue you had with the battery being low but before I installed the update. She said it happened a few times but it isn't consistent. I just installed the update yesterday so we will see.I just installed the new map update on 20 Nov on my 2017 Impreza. Got to work this morning and car said my Fob battery is low (Just put in a new battery in the Fob last month) Got out of car and tried locking by touching the handle and dash said to remove Fob from car and would not lock by touching the handle. I am thinking this latest update has some glitches. Did anyone else have problems with the update?