In Tanki X, Team Deathmatch is possibly the most popular battle mode among the three... or at least as equally popular as CTF mode.
This battle mode is similar to Deathmatch in many ways. For starters, the winner in the battle is the side with the most kills when the time is up, or has reached the required number of kills to win. Naturally, if most of your teammates have a D/L ratio of 1 and above, victory is mostly assured.
Unlike its "sibling" battle mode, Deathmatch, Team Deathmatch places a strong emphasis on teamwork. This generally means that you'll need to have your teammates' backs as they will have yours. For this to work though, you'll need to move (advance or retreat) with the team and not go "lone ranger" and get yourself swamped by the enemy.
Now, before you get any ideas of using self-destruct to bump up your team's score, you also should know that in this battle mode, every self-destruct counts against your own team. This means that if you self-destruct, your team will lose 1 point. So, be careful where you are going when playing TDM and try not to get yourself overturned.