Buy on Amazon : http://www.amazon.com/gp/product/B00104EQ8W?tag=scratchandsti-20

Sony BP-U60 Rechargeable Lithium-ion 14.4 volt 56Wh Battery Pack for the XDCAM EX Camcorders

Rechargeable Lithium-ion Battery Pack for PMW-EX1EX3 and PHU-60K
BP-U60 also has LED displays to indicate the remaining capacity of the battery at the push of a button on the battery itself