The pictured Anton Bauer QBH-HD Battery Holder drops from $589.50 to $515.81 at Adorama and Shipping is free!
BH (Quad Battery Holder)... The QBH is a versatile portable power accessory which allows seamless battery changes continuously powering any 12 volt (nominal) equipment.
It is especially valuable in circumstances where equipment needs to be in continuous operation for long periods of time or for operating equipment demanding high currents (up to 10 amps).
Cameras, monitors and portable field editors can be operated for as long a period as necessary, substituting fresh batteries for depleted ones without interrupting operation. As batteries are depleted, unit automatically draws fromthe second bank.
As long as charged batteries are available, the equipment can be operated indefinitely and without interruption.