How to run Casio CT-X5000 on battery power!

How to run Casio's CT-X5000 on battery power! Traditional DC power supplies won't work because the CT-X5000 runs on 24 Volts DC and a higher amperage! Because of this, a portable AC power supply is needed instead!
Here's my review on the Coolis HP15 portable AC power supply:
• Coolis HP150 - Portabl...