You have a big possibility of getting stuck in the MM queue and then lose account access temporarily. No solution has been found yet, so the best option is to not play team battles.
http://forum.worldoftanks.com/index.php?/topic/437052-stuck-in-matchmaking-in-team-battles/
http://forum.worldoftanks.com/index.php?/topic/436834-stuck-in-team-battles/
