Is it critical the battery firmware be updated to use it? What would be a problem if a battery not using the latest firmware is used to fly? For instance, how could the X-Star's performance be affected if I used an older (or recently purchased) battery not updated with the newest firmware version? There could be an instance where someone could be where updates aren't possible and had only a battery or two with older firmware to use even though the X-Star itself is updated. My example: I have access to a remote cabin where there is no wi-fi or any way to download an update. There are a couple of batteries there that do not have the latest firmware on them. I see no reason they wouldn't work but just wonder if they would cause any flight issues.