The Braille Battery 12.5 Ah Xcel-Lite Lithium battery offers excellent performance for size and weight.  This battery has the positive terminal on the right side of the battery.
The specification for this battery is:
  
    | Part Number | 
    XC12.5-625-1 | 
  
  
    | Nominal Capacity (Ah) | 
    12.5 | 
  
  
    | Weight (Kg) | 
    2.1 | 
  
  
    | Dimensions (LxWxH) (mm) | 
    178 x 76 x 159 |