Sram:

There are two ways to power Eagle Powertrain. The Eagle Powertrain Full Size battery gives riders all the range they need, to help them go farther for longer. For the rider who prefers performance over long range, the Eagle Powertrain Compact Battery comes in a smaller and lighter package than Eagle Powertrain Full Size battery. Its smaller and lighter form factor enables a sportier ride-feel and is well-suited to competition, yet still supports the full power of the motor for 90% of every ride.