Definitions by Nigel Gaming

Battle Rating 

Battle rating (BR) is a value used to determine matchmaking in War Thunder. Battle rating is a number assigned to every aircraft, ground unit, and naval vessel in the game that correlates with their effectiveness in combat.

The M1A2 has a Battle Rating of 10.7

Gaijin moved the T80U to 10.3

Battle Rating by Nigel Gaming February 15, 2021