Ace Power 1500mah 11.1V Lipo Battery 40C 3S with Deans Connection. 

Lipo batteries cannot be sent via express. 

Specs: 

Length: 75mm
Width: 34mm
Height: 25mm
Weight: 121grams 
Type: Softcase
Plug: Deans 
Capacity: 1500mah
C Rate: 40C
Cells: 3
Voltage: 11.1v